@article {2325, title = {Model-based super-resolution reconstruction for pseudo-continuous Arterial Spin Labeling}, journal = {NeuroImage}, volume = {286}, year = {2024}, month = {01/2024}, pages = {120506}, abstract = {Arterial spin labeling (ASL) is a promising, non-invasive perfusion magnetic resonance imaging technique for quantifying cerebral blood flow (CBF). Unfortunately, ASL suffers from an inherently low signal-to-noise ratio (SNR) and spatial resolution, undermining its potential. Increasing spatial resolution without significantly sacrificing SNR or scan time represents a critical challenge towards routine clinical use. In this work, we propose a model-based super-resolution reconstruction (SRR) method with joint motion estimation that breaks the traditional SNR/resolution/scan-time trade-off. From a set of differently oriented 2D multi-slice pseudo-continuous ASL images with a low through-plane resolution, 3D-isotropic, high resolution, quantitative CBF maps are estimated using a Bayesian approach. Experiments on both synthetic whole brain phantom data, and on in vivo brain data, show that the proposed SRR Bayesian estimation framework outperforms state-of-the-art ASL quantification.}, keywords = {Arterial spin labeling, CBF mapping, Model-based reconstruction, Perfusion, Quantitative MRI, super-resolution}, issn = {1053-8119}, doi = {10.1016/j.neuroimage.2024.120506}, author = {Quinten Beirinckx and Piet Bladt and Merlijn C E van der Plas and M.J.P van Osch and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @article {2256, title = {ADEPT: Accurate Diffusion EPI with multi-contrast shoTs}, journal = {Magnetic Resonance in Medicine}, volume = {89}, year = {2023}, pages = {396-410}, doi = {10.1002/mrm.29398}, author = {Banafshe Shafieizargar and Ben Jeurissen and Dirk H J Poot and Stefan Klein and Johan Van Audekerke and Verhoye, Marleen and Arnold Jan den Dekker and Jan Sijbers} } @article {2297, title = {dtiRIM: A generalisable deep learning method for diffusion tensor imaging}, journal = {Neuroimage}, volume = {269}, year = {2023}, chapter = {119900}, doi = {10.1016/j.neuroimage.2023.119900}, author = {Emanoel Ribeiro Sabidussi and Stefan Klein and Ben Jeurissen and Dirk H J Poot} } @article {2298, title = {Fiber Orientation Estimation from X-ray Dark Field Images of Fiber Reinforced Polymers using Constrained Spherical Deconvolution}, journal = {Polymers}, volume = {15}, year = {2023}, pages = {2887}, doi = {https://doi.org/10.3390/polym15132887}, author = {Ben Huyge and Jonathan Sanctorum and Ben Jeurissen and Jan De Beenhouwer and Jan Sijbers} } @article {2304, title = {ImWIP: open-source image warping toolbox with adjoints and derivatives}, journal = {SoftwareX}, volume = {24}, year = {2023}, pages = {101524}, doi = {https://doi.org/10.1016/j.softx.2023.101524}, author = {Jens Renders and Ben Jeurissen and Anh-Tuan Nguyen and Jan De Beenhouwer and Jan Sijbers} } @article {2274, title = {Optimal experimental design and estimation for q-space trajectory imaging}, journal = {Human Brain Mapping}, volume = {44}, year = {2023}, pages = {1793-1809}, abstract = {Tensor-valued diffusion encoding facilitates data analysis by q-space trajectory imaging. By modeling the diffusion signal of heterogeneous tissues with a diffusion tensor distribution (DTD) and modulating the encoding tensor shape, this novel approach allows disentangling variations in diffusivity from microscopic anisotropy, orientation dispersion, and mixtures of multiple isotropic diffusivities. To facilitate the estimation of the DTD parameters, a parsimonious acquisition scheme coupled with an accurate and precise estimation of the DTD is needed. In this work, we create two precision-optimized acquisition schemes: one that maximizes the precision of the raw DTD parameters, and another that maximizes the precision of the scalar measures derived from the DTD. The improved precision of these schemes compared to a naive sampling scheme is demonstrated in both simulations and real data. Furthermore, we show that the weighted linear least squares (WLLS) estimator that uses the squared reciprocal of the noisy signal as weights can be biased, whereas the iteratively WLLS estimator with the squared reciprocal of the predicted signal as weights outperforms the conventional unweighted linear LS and nonlinear LS estimators in terms of accuracy and precision. Finally, we show that the use of appropriate constraints can considerably increase the precision of the estimator with only a limited decrease in accuracy.}, doi = {10.1002/hbm.26175}, author = {Jan Morez and Szczepankiewicz, Filip and Arnold Jan den Dekker and Floris Vanhevel and Jan Sijbers and Ben Jeurissen} } @article {2270, title = {Prolonged microgravity induces reversible and persistent changes on human cerebral connectivity}, journal = {Communications Biology}, volume = {6}, year = {2023}, doi = {https://doi.org/10.1038/s42003-022-04382-w}, author = {Steven Jillings and Ekaterina V. Pechenkova and Elena Tomilovskaya and Ilya Rukavishnikov and Ben Jeurissen and Angelique Van Ombergen and Nosikova, Inna and Alena Rumshiskaya and Liudmila Litvinova and Annen, Jitka and Chloe De Laet and Catho Schoenmaekers and Jan Sijbers and Petrovichev, Victor and Stefan Sunaert and Paul M Parizel and Valentin Sinitsyn and zu Eulenburg, P and Steven S L Laureys and Athena Demertzi and Floris L Wuyts} } @inproceedings {2288, title = {Super-resolution reconstruction of multi-slice T2-w FLAIR MRI improves Multiple Sclerosis lesion segmentation}, booktitle = {45th Annual International Conference of the IEEE Engineering in Medicine and Biology Society}, year = {2023}, abstract = {Due to acquisition time constraints, T2-w FLAIR MRI of Multiple Sclerosis (MS) patients is often acquired with multi-slice 2D protocols with a low through-plane resolution rather than with high-resolution 3D protocols. Automated lesion segmentation on such low-resolution (LR) images, however, performs poorly and leads to inaccurate lesion volume estimates. Super-resolution reconstruction (SRR) methods can then be used to obtain a high-resolution (HR) image from multiple LR images to serve as input for lesion segmentation. In this work, we evaluate the effect on MS lesion segmentation of three SRR approaches: one based on interpolation, a state-of-the-art self-supervised CNN-based strategy, and a recently proposed model-based SRR method. These SRR strategies were applied to LR acquisitions simulated from 3D T2-w FLAIR MRI of MS patients. Each SRR method was evaluated in terms of image reconstruction quality and posterior lesion segmentation performance. When compared to segmentation on LR images, the three considered SRR strategies demonstrate improved lesion segmentation. Furthermore, in some scenarios, SRR achieves a similar segmentation performance compared to segmentation of HR images.}, author = {Giraldo, Diana and Quinten Beirinckx and Arnold Jan den Dekker and Ben Jeurissen and Jan Sijbers} } @article {2216, title = {Brain Connectometry Changes in Space Travelers After Long-Duration Spaceflight}, journal = {Front. Neural Circuits}, volume = {16}, year = {2022}, doi = {https://doi.org/10.3389/fncir.2022.815838}, author = {Andrei Doroshin and Steven Jillings and Ben Jeurissen and Elena Tomilovskaya and Ekaterina V. Pechenkova and Nosikova, Inna and Alena Rumshiskaya and Liudmila Litvinova and Ilya Rukavishnikov and Chloe De Laet and Catho Schoenmaekers and Jan Sijbers and Steven S L Laureys and Petrovichev, Victor and Angelique Van Ombergen and Jitka Annen and Stefan Sunaert and Paul M Parizel and Valentin Sinitsyn and zu Eulenburg, Peter and Karol Osipowicz and Floris L Wuyts} } @mastersthesis {2218, title = {Computational anatomy strategies for characterization of brain patterns associated with Alzheimer{\textquoteright}s disease}, volume = {PhD in Science}, year = {2022}, type = {PhD thesis}, author = {Giraldo, Diana} } @article {2215, title = {The effect of prolonged Spaceflight on Cerebrospinal Fluid and Perivascular Spaces of Astronauts and Cosmonauts}, journal = {PNAS}, volume = {119}, year = {2022}, chapter = {e2120439119}, doi = {https://doi.org/10.1073/pnas.2120439119}, author = {Giuseppe Barisano and Farshid Sepehrband and Heather R. Collins and Steven Jillings and Ben Jeurissen and Andrew J. Taylor and Catho Schoenmaekers and Chloe De Laet and Ilya Rukavishnikov and Inna Nosikova and Alena Rumshiskaya and Jitka Annen and Jan Sijbers and Steven S L Laureys and Angelique Van Ombergen and Petrovichev, Victor and Valentin Sinitsyn and Ekaterina V. Pechenkova and Alexey Grishin and Peter zu Eulenburg and Meng Law and Stefan Sunaert and Paul M. Parizel and Elena Tomilovskaya and Donna Roberts and Floris L Wuyts} } @inproceedings {2272, title = {Fiber orientation estimation by constrained spherical deconvolution of the anisotropic edge illumination x-ray dark field signal}, booktitle = {SPIE: Developments in X-Ray Tomography XIV}, volume = {12242}, year = {2022}, pages = {122420V }, doi = {ttps://doi.org/10.1117/12.2633482}, author = {Ben Huyge and Ben Jeurissen and Jan De Beenhouwer and Jan Sijbers} } @article {2235, title = {Improved diffusion parameter estimation by incorporating T2 relaxation properties into the DKI-FWE model}, journal = {NeuroImage}, volume = {256}, year = {2022}, pages = {119219}, doi = {https://doi.org/10.1016/j.neuroimage.2022.119219}, author = {Vincenzo Anania and Quinten Collier and Jelle Veraart and Annemieke Eline Buikema and Floris Vanhevel and Thibo Billiet and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @article {2265, title = {Investigating tissue-specific abnormalities in Alzheimer{\textquoteright}s disease with multi-shell diffusion MRI}, journal = {Journal of Alzheimer{\textquoteright}s Disease}, volume = {90}, year = {2022}, pages = {1771-1791}, doi = {10.3233/JAD-220551}, author = {Giraldo, Diana and Robert Elton Smith and Hanna Struyfs and Ellis Niemantsverdriet and Ellen De Roeck and Maria Bjerke and Sebastiaan Engelborghs and Romero, Eduardo and Jan Sijbers and Ben Jeurissen} } @article {2247, title = {Model-based super-resolution reconstruction with joint motion estimation for improved quantitative MRI parameter mapping}, journal = {Computerized Medical Imaging and Graphics}, volume = {100}, year = {2022}, month = {09/2022}, pages = {1-16}, chapter = {102071}, abstract = {Quantitative Magnetic Resonance (MR) imaging provides reproducible measurements of biophysical parameters, and has become an essential tool in clinical MR studies. Unfortunately, 3D isotropic high resolution (HR) parameter mapping is hardly feasible in clinical practice due to prohibitively long acquisition times. Moreover, accurate and precise estimation of quantitative parameters is complicated by inevitable subject motion, the risk of which increases with scanning time. In this paper, we present a model-based super-resolution reconstruction (SRR) method that jointly estimates HR quantitative parameter maps and inter-image motion parameters from a set of 2D multi-slice contrast-weighted images with a low through-plane resolution. The method uses a Bayesian approach, which allows to optimally exploit prior knowledge of the tissue and noise statistics. To demonstrate its potential, the proposed SRR method is evaluated for a T1 and T2 quantitative mapping protocol. Furthermore, the method{\textquoteright}s performance in terms of precision, accuracy, and spatial resolution is evaluated using simulated as well as real brain imaging experiments. Results show that our proposed fully flexible, quantitative SRR framework with integrated motion estimation outperforms state-of-the-art SRR methods for quantitative MRI.}, issn = {0895-6111}, doi = {https://doi.org/10.1016/j.compmedimag.2022.102071}, author = {Quinten Beirinckx and Ben Jeurissen and Michele Nicastro and Dirk H J Poot and Marleen Verhoye and Arnold Jan den Dekker and Jan Sijbers} } @conference {2233, title = {Optimal acquisition settings for simultaneous diffusion kurtosis, free water fraction and T2 estimation}, year = {2022}, author = {Vincenzo Anania and Ben Jeurissen and Jan Morez and Annemieke Eline Buikema and Thibo Billiet and Jan Sijbers and Arnold Jan den Dekker} } @article {2275, title = {To shift or to rotate? Comparison of acquisition strategies for multi-slice super-resolution magnetic resonance imaging}, journal = {Frontiers in Neuroscience}, year = {2022}, pages = {1-18}, doi = {https://doi.org/10.3389/fnins.2022.1044510}, author = {Michele Nicastro and Ben Jeurissen and Quinten Beirinckx and Celine Smekens and Dirk H J Poot and Jan Sijbers and Arnold Jan den Dekker} } @conference {2184, title = {Accelerated multi-shot diffusion weighted imaging with joint estimation of diffusion and phase parameters}, volume = {34}, year = {2021}, pages = {S57-S58}, doi = {10.1007/s10334-021-00947-8}, author = {Banafshe Shafieizargar and Ben Jeurissen and Dirk H J Poot and Johan Van Audekerke and Marleen Verhoye and Arnold Jan den Dekker and Jan Sijbers} } @article {2143, title = {Associations between different white matter properties and reward-based performance modulation}, journal = {Brain Structure and Function}, year = {2021}, month = {Apr-02-2021}, issn = {1863-2653}, doi = {10.1007/s00429-021-02222-x}, url = {https://link.springer.com/content/pdf/10.1007/s00429-021-02222-x.pdf}, author = {Park, Haeme R. P. and Verhelst, Helena and Quak, Michel and Ben Jeurissen and Krebs, Ruth M.} } @inproceedings {2159, title = {Comparison of MR acquisition strategies for super-resolution reconstruction using the Bayesian Mean Squared Error}, booktitle = { International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine}, year = {2021}, abstract = {In multi-slice super-resolution reconstruction (MS-SRR), a high resolution image, referred to as SRR image, is estimated from a series of multi-slice images with a low through-plane resolution. This work proposes a framework based on the Bayesian mean squared error of the Maximum A Posteriori estimator of a SRR image to compare the accuracy and precision of two commonly adopted MR acquisition strategies in MS-SRR. The first strategy consists in acquiring a set of multi-slice images, where each image is shifted in the through-plane direction by a different, sub-pixel distance. The latter consists in acquiring a set of multi-slice images, where each image is rotated around the frequency or phase-encoding axis by a different rotation angle. Results show that MS-SRR based on rotated multi-slice images outperforms MS-SRR based on shifted multi-slice images in terms of accuracy, precision and mean squared error of the reconstructed image.}, author = {Michele Nicastro and Ben Jeurissen and Quinten Beirinckx and Celine Smekens and Dirk H J Poot and Jan Sijbers and Arnold Jan den Dekker} } @conference {2180, title = {Decoding Multiple Sclerosis EDSS disability scores from MRI using Deep Learning}, volume = {34}, year = {2021}, pages = {S57-S58}, doi = {10.1007/s10334-021-00947-8}, author = {Roberto Paolella and Ezequiel de la Rosa and Diana M. Sima and Dominique Dive and Francoise Durand-Dubief and Dominique Sappey-Marinier and Ben Jeurissen and Jan Sijbers and Thibo Billiet} } @article {2179, title = {On the generalizability of diffusion MRI signal representations across acquisition parameters, sequences and tissue types: chronicles of the MEMENTO challenge}, journal = {NeuroImage}, volume = {240}, year = {2021}, doi = {https://doi.org/10.1016/j.neuroimage.2021.118367}, author = {Alberto De Luca and Andrada Ianus and Alexander Leemans and Marco Palombo and Noam Shemesh and Hui Zhang and Daniel C Alexander and Markus Nilsson and Martijn Froeling and Geert-Jan Biessels and Mauro Zucchelli and Matteo Frigo and Enes Albay and Sara Sedlar and Abib Alimi and Samuel Deslauriers-Gauthier and Rachid Deriche and Rutger Fick and Maryam Afzali and Tomasz Pieciak and Fabian Bogusz and Santiago Aja-Fernandez and Evren Ozarslan and Derek K. Jones and Haoze Chen and Mingwu Jin and Zhijie Zhang and Fenxiang Wang and Vishwesh Nath and Prasanna Parvathaneni and Jan Morez and Jan Sijbers and Ben Jeurissen and Shreyas and Fadnavis and Stefan Endres and Ariel Rokem and Eleftherios Garyfallidis and Irina Sanchez and Vesna Prchkovska and Paulo Rodrigues and Bennet A. Landman and Kurt G Schilling} } @conference {2205, title = {High-resolution T2* mapping of the knee based on UTE Spiral VIBE MRI}, volume = {34}, year = {2021}, pages = {S53-S54}, author = {Celine Smekens and Quinten Beirinckx and Floris Vanhevel and Pieter Van Dyck and Arnold Jan den Dekker and Jan Sijbers and Thomas Janssens and Ben Jeurissen} } @mastersthesis {2140, title = {The impact of long-duration spaceflight on brain structure and function}, volume = {Doctor of Science}, year = {2021}, school = {University of Antwerp}, type = {PhD thesis}, abstract = {In over half a century of crewed missions to space, many different effects of spaceflight on the human body have been uncovered so far. However, little focus has been directed to investigating how space stressors affect the human brain. The largest body of work in this dissertation describes pioneering findings on brain structural and functional changes after spaceflight in Roscosmos cosmonauts by means of multi-modal magnetic resonance imaging (MRI) in a longitudinal and prospective design. Structural MRI modalities, such as T1-weighted and diffusion MRI, were used to unravel macroscopic volume and microstructural brain tissue composition changes. We found a widespread redistribution of the cerebrospinal fluid (CSF) with secondary mechanistic effects on the grey matter (GM) tissue. We also revealed increased neural tissue volume in motor regions of the brain that suggest evidence for structural brain adaptations, also known as neuroplasticity, associated with altered motor strategies in space. Most CSF changes after spaceflight were still detectable more than half a year after return to Earth, while the GM changes after spaceflight partially reversed in the long term. In addition, functional MRI data was acquired in these cosmonauts to study functional reorganisation of the brain after spaceflight, showing numerous functional connectivity (FC) alterations after spaceflight. Some of these changes persisted in the longer-term, whereas other changes returned back to pre-flight levels. Furthermore, this work also describes the experimental work and preliminary analyses of several Earth-based models. One is a longitudinal MRI pilot study in hindlimb-unloaded (HLU) mice, inducing fluid shifts to the head region, in order to better understand the consequence of these fluid shifts on the brain. A second study was performed in fighter pilots as a model for exposure to high g-levels and sensory conflicts, in which FC was compared to that in a control group. This work rendered a vast increase in available information on structural and functional brain changes after spaceflight compared to several years ago. In the future, the underlying mechanisms of the observed findings need to be understood in more detail. Ultimately, we aim to characterise the effects space stressors have on the brain, to then attempt to mitigate these changes through countermeasures and characterise beneficial coping mechanisms that we can enhance, in order to be fully prepared for future exploration missions into deep space.}, author = {Steven Jillings} } @inproceedings {2189, title = {Multi-contrast multi-shot EPI for accelerated diffusion MRI}, booktitle = {43rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society}, year = {2021}, pages = {3869-3872}, doi = {10.1109/EMBC46164.2021.9630069}, author = {Banafshe Shafieizargar and Ben Jeurissen and Dirk H J Poot and Arnold Jan den Dekker and Jan Sijbers} } @article {2232, title = {Multi-tissue spherical deconvolution of tensor-valued diffusion MRI.}, journal = {Neuroimage}, volume = {245}, year = {2021}, month = {2021 12 15}, pages = {118717}, abstract = {Multi-tissue constrained spherical deconvolution (MT-CSD) leverages the characteristic b-value dependency of each tissue type to estimate both the apparent tissue densities and the white matter fiber orientation distribution function from diffusion MRI data. In this work, we generalize MT-CSD to tensor-valued diffusion encoding with arbitrary b-tensor shapes. This enables the use of data encoded with mixed b-tensors, rather than being limited to the subset of linear (conventional) b-tensors. Using the complete set of data, including all b-tensor shapes, provides a categorical improvement in the estimation of apparent tissue densities, fiber ODF, and resulting tractography. Furthermore, we demonstrate that including multiple b-tensor shapes in the analysis provides improved contrast between tissue types, in particular between gray matter and white matter. We also show that our approach provides high-quality apparent tissue density maps and high-quality fiber tracking from data, even with sparse sampling across b-tensors that yield whole-brain coverage at 2~mm isotropic resolution in approximately 5:15~min.}, keywords = {Brain Mapping, diffusion tensor imaging, Healthy Volunteers, Humans, Image Processing, Computer-Assisted, white matter}, issn = {1095-9572}, doi = {10.1016/j.neuroimage.2021.118717}, author = {Ben Jeurissen and Szczepankiewicz, Filip} } @conference {2182, title = {Optimal experimental design for the T2-weighted diffusion kurtosis imaging free water elimination model}, volume = {34}, year = {2021}, pages = {S54-S55}, doi = {https://doi.org/10.1007/s10334-021-00947-8}, author = {Vincenzo Anania and Ben Jeurissen and Jan Morez and Annemieke Eline Buikema and Thibo Billiet and Jan Sijbers and Arnold Jan den Dekker} } @conference {2181, title = {Rotated or shifted sets of multi-slice MR images for super-resolution reconstruction? A Bayesian answer}, volume = {34}, year = {2021}, pages = {S56-S57}, doi = {10.1007/s10334-021-00947-8}, author = {Michele Nicastro and Ben Jeurissen and Quinten Beirinckx and Celine Smekens and Dirk H J Poot and Jan Sijbers and Arnold Jan den Dekker} } @conference {2160, title = {Super-resolution T2* mapping of the knee using UTE Spiral VIBE MRI}, year = {2021}, pages = {3920}, abstract = {T2* mapping using ultrashort echo time (UTE) MRI allows for quantitative evaluation of collagen-rich knee structures with short mean transverse relaxation times. However, acquisitions with low through-plane resolution are commonly used to obtain T2* maps within reasonable scan times, affecting the accuracy of the estimations because of partial volume effects. In this work, model-based super-resolution reconstructions based on UTE Spiral VIBE MRI were performed to obtain high-resolution T2* maps of knee structures within a reasonable scan time. The obtained T2* maps are comparable to maps generated with direct 3D UTE Spiral VIBE acquisitions while requiring approximately 25\% less scan time.}, author = {Celine Smekens and Quinten Beirinckx and Floris Vanhevel and Pieter Van Dyck and Arnold Jan den Dekker and Jan Sijbers and Thomas Janssens and Ben Jeurissen} } @article {2080, title = {Constrained spherical deconvolution of non-spherically sampled diffusion MRI data}, journal = {Human Brain Mapping}, volume = {42}, year = {2020}, pages = {521{\textendash}538}, doi = {10.1002/hbm.25241}, author = {Jan Morez and Jan Sijbers and Floris Vanhevel and Ben Jeurissen} } @conference {Jillings2020-nb, title = {Diffusion MRI reveals macro- and microstructural changes in cosmonauts{\textquoteright} brains after long-duration spaceflight}, year = {2020}, pages = {4531}, author = {Jillings, S and Angelique Van Ombergen and Tomilovskaya, E and Rumshiskaya, A and Litvinova, L and Nosikova, I and Pechenkova, E and Rukavishnikov, I and Kozlovskaya, I and Stefan Sunaert and Paul M Parizel and Sinitsyn, V and Petrovichev, V and Laureys, S and zu Eulenburg, P and Jan Sijbers and Floris L Wuyts and Ben Jeurissen} } @article {2037, title = {Harmonisation of Brain Diffusion MRI: Concepts and Methods}, journal = {Frontiers in Neuroscience }, volume = {14}, year = {2020}, month = {03/2020}, pages = {1-17}, doi = {https://doi.org/10.3389/fnins.2020.00396}, author = {Maira Siqueira Pinto and Roberto Paolella and Thibo Billiet and Pieter Van Dyck and Pieter-Jan Guns and Ben Jeurissen and Annemie Ribbens and Arnold Jan den Dekker and Jan Sijbers} } @conference {2021, title = {Improved voxel-wise quantification of diffusion and kurtosis metrics in the presence of noise and intensity outliers}, year = {2020}, url = {https://www.ismrm-benelux.org/wp-content/uploads/2020/01/Proceedings2020.pdf}, author = {Vincenzo Anania and Thibo Billiet and Ben Jeurissen and Annemie Ribbens and Arnold Jan den Dekker and Jan Sijbers} } @conference {2024, title = {Joint estimation of phase and diffusion tensor parameters from multi-shot k-q-space data: a proof of concept}, volume = {28}, year = {2020}, abstract = {To address the issue of phase induced artifacts in multi-shot diffusion weighted imaging, we propose a model-based framework which enables the joint estimation of diffusion and phase parameters directly from the multi-shot k-q-space. In a simulation study, we show that using this framework, diffusion parameters can be estimated more accurately and precisely than with the conventional method (image reconstruction followed by voxel-wise model fitting) that ignores phase differences.}, keywords = {Diffusion MRI, MRI, Phase estimation}, author = {Banafshe Shafieizargar and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @conference {2025, title = {Joint estimation of phase and diffusion tensor parameters from multi-shot k-q-space data: a proof of concept}, volume = {12}, year = {2020}, abstract = {To address the issue of phase induced artifacts in multi-shot diffusion weighted imaging, we propose a model-based framework which enables the joint estimation of diffusion and phase parameters directly from the multi-shot k-q-space. In a simulation study, we show that using this framework, diffusion parameters can be estimated more accurately and precisely than with the conventional method (image reconstruction followed by voxel-wise model fitting) that ignores phase differences.}, keywords = {Diffusion MRI, MRI, Phase estimation}, author = {Banafshe Shafieizargar and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @article {1971, title = {Joint Maximum Likelihood estimation of motion and T1 parameters from magnetic resonance images in a super-resolution framework: a simulation study}, journal = {Fundamenta Informaticae}, volume = {172}, year = {2020}, pages = {105{\textendash}128}, abstract = {Magnetic resonance imaging (MRI) based T1 mapping allows spatially resolved quantification of the tissue-dependent spin-lattice relaxation time constant T1, which is a potential biomarker of various neurodegenerative diseases, including Multiple Sclerosis, Alzheimer disease, and Parkinson{\textquoteright}s disease. In conventional T1 MR relaxometry, a quantitative T1 map is obtained from a series of T1-weighted MR images. Acquiring such a series, however, is time consuming. This has sparked the development of more efficient T1 mapping methods, one of which is a super-resolution reconstruction (SRR) framework in which a set of low resolution (LR) T1-weighted images is acquired and from which a high resolution (HR) T1 map is directly estimated. In this paper, the SRR T1 mapping framework is augmented with motion estimation. That is, motion between the acquisition of the LR T1-weighted images is modeled and the motion parameters are estimated simultaneously with the T1 parameters. Based on Monte Carlo simulation experiments, we show that such an integrated motion/relaxometry estimation approach yields more accurate T1 maps compared to a previously reported SRR based T1 mapping approach.}, doi = {10.3233/FI-2020-1896}, author = {Quinten Beirinckx and Gabriel Ramos-Llord{\'e}n and Ben Jeurissen and Dirk H J Poot and Paul M Parizel and Marleen Verhoye and Jan Sijbers and Arnold Jan den Dekker} } @article {2074, title = {Macro- and microstructural changes in cosmonauts{\textquoteright} brains after long-duration spaceflight}, journal = {Science Advances}, volume = {6}, year = {2020}, month = {Apr-09-2020}, pages = {eaaz9488}, abstract = {Long-duration spaceflight causes widespread physiological changes, although its effect on brain structure remains poorly understood. In this work, we acquired diffusion magnetic resonance imaging to investigate alterations of white matter (WM), gray matter (GM), and cerebrospinal fluid (CSF) compositions in each voxel, before, shortly after, and 7 months after long-duration spaceflight. We found increased WM in the cerebellum after spaceflight, providing the first clear evidence of sensorimotor neuroplasticity. At the region of interest level, this increase persisted 7 months after return to Earth. We also observe a widespread redistribution of CSF, with concomitant changes in the voxel fractions of adjacent GM. We show that these GM changes are the result of morphological changes rather than net tissue loss, which remained unclear from previous studies. Our study provides evidence of spaceflight-induced neuroplasticity to adapt motor strategies in space and evidence of fluid shift{\textendash}induced mechanical changes in the brain.}, doi = {10.1126/sciadv.aaz9488}, url = {https://advances.sciencemag.org/content/6/36/eaaz9488}, author = {Jillings, Steven and Angelique Van Ombergen and Tomilovskaya, Elena and Rumshiskaya, Alena and Litvinova, Liudmila and Nosikova, Inna and Pechenkova, Ekaterina and Rukavishnikov, Ilya and Kozlovskaya, Inessa B. and Manko, Olga and Danilichev, Sergey and Stefan Sunaert and Paul M Parizel and Sinitsyn, Valentin and Petrovichev, Victor and Laureys, Steven and zu Eulenburg, Peter and Jan Sijbers and Floris L Wuyts and Ben Jeurissen} } @conference {2019, title = {Optimal design of a T1 super-resolution reconstruction experiment: a simulation study}, year = {2020}, author = {Michele Nicastro and Quinten Beirinckx and Piet Bladt and Ben Jeurissen and Stefan Klein and Jan Sijbers and Dirk H J Poot and Arnold Jan den Dekker} } @conference {Morez2020-al, title = {Optimal experimental design for multi-tissue spherical deconvolution of diffusion MRI}, year = {2020}, pages = {4321}, author = {Jan Morez and Jan Sijbers and Ben Jeurissen} } @conference {Smekens2020-mo, title = {Short T2* quantification of knee structures based on accelerated UTE Spiral VIBE MRI with SPIRiT reconstruction}, year = {2020}, pages = {2687}, author = {Celine Smekens and Vanhevel, F and Ben Jeurissen and Pieter Van Dyck and Jan Sijbers and Janssens, T} } @conference {2026, title = {Short T2* quantification of knee structures based on accelerated UTE Spiral VIBE MRI with SPIRiT reconstruction}, year = {2020}, author = {Celine Smekens and Floris Vanhevel and Ben Jeurissen and Pieter Van Dyck and Jan Sijbers and Thomas Janssens} } @article {2031, title = {Super-Resolution Magnetic Resonance Imaging of the Knee Using 2-Dimensional Turbo Spin Echo Imaging}, journal = {Investigative Radiology}, volume = {55}, year = {2020}, pages = {481-493}, doi = {10.1097/RLI.0000000000000676}, author = {Pieter Van Dyck and Celine Smekens and Floris Vanhevel and Eline De Smet and Ella Roelant and Jan Sijbers and Ben Jeurissen} } @conference {2139, title = {Super-resolution reconstruction of single-PLD pseudo-continuous ASL images}, year = {2020}, pages = {3293}, abstract = {Super-resolution reconstruction (SRR) allows for 3D high-resolution image reconstruction from a set of low-resolution multi-slice images with different orientations. Arterial spin labeling (ASL) is an interesting albeit complicated candidate for SRR, as it relies on subtraction. SRR-ASL can be performed on low-SNR subtracted or on low-contrast unsubtracted ASL data. Different ASL-SRR implementations were applied to single-PLD PCASL data and validated against traditional ASL-scans. Combining motion correction, super-resolution post-processing and pairwise subtraction of label-control pairs in a single framework yielded comparable CBF maps as with traditional HR-ASL. Furthermore, in certain slices, SRR-ASL appears to reconstruct the anatomical structure with higher fidelity.}, author = {Piet Bladt and Quinten Beirinckx and Merlijn C E van der Plas and Sophie Schmid and Wouter M Teeuwisse and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers and M.J.P van Osch} } @conference {Bladt2020-mp, title = {Super-resolution reconstruction of single-PLD pseudo-continuous ASL images}, year = {2020}, pages = {3293}, author = {Bladt, P and Beirinckx, Q and Van der Plas, M and Schmid, S and Teeuwisse, W and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers and van Osch, M} } @conference {2015, title = {Super-resolution strategies for single-PLD pseudo-continuous ASL}, year = {2020}, address = {Arnhem, The Netherlands}, abstract = {Super-resolution reconstruction (SRR) allows for 3D high-resolution image reconstruction from a set of low-resolution multi-slice images with different orientations. Arterial spin labeling (ASL) is an interesting albeit complicated candidate for SRR, as it relies on subtraction. SRR-ASL can be performed on low-SNR subtracted or on low-contrast unsubtracted ASL data. Different ASL-SRR implementations were applied to single-PLD PCASL data and validated against traditional ASL-scans. Combining motion correction, super-resolution post-processing and pairwise subtraction of label-control pairs in a single framework yielded comparable CBF maps as with traditional HR-ASL. Furthermore, in certain slices, SRR-ASL appears to reconstruct the anatomical structure with higher fidelity.}, author = {Quinten Beirinckx and Piet Bladt and Merlijn C E van der Plas and Sophie Schmid and Wouter M Teeuwisse and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers and M.J.P van Osch} } @conference {2101, title = {Tracking Off the Beaten Track}, year = {2020}, pages = {e975}, address = {Sydney, Australia}, author = {Ben Jeurissen} } @article {1964, title = {Alterations of Functional Brain Connectivity After Long-Duration Spaceflight as Revealed by fMRI.}, journal = {Front Physiol}, volume = {10}, year = {2019}, pages = {1-23}, abstract = {

The present study reports alterations of task-based functional brain connectivity in a group of 11 cosmonauts after a long-duration spaceflight, compared to a healthy control group not involved in the space program. To elicit the postural and locomotor sensorimotor mechanisms that are usually most significantly impaired when space travelers return to Earth, a plantar stimulation paradigm was used in a block design fMRI study. The motor control system activated by the plantar stimulation involved the pre-central and post-central gyri, SMA, SII/operculum, and, to a lesser degree, the insular cortex and cerebellum. While no post-flight alterations were observed in terms of activation, the network-based statistics approach revealed task-specific functional connectivity modifications within a broader set of regions involving the activation sites along with other parts of the sensorimotor neural network and the visual, proprioceptive, and vestibular systems. The most notable findings included a post-flight increase in the stimulation-specific connectivity of the right posterior supramarginal gyrus with the rest of the brain; a strengthening of connections between the left and right insulae; decreased connectivity of the vestibular nuclei, right inferior parietal cortex (BA40) and cerebellum with areas associated with motor, visual, vestibular, and proprioception functions; and decreased coupling of the cerebellum with the visual cortex and the right inferior parietal cortex. The severity of space motion sickness symptoms was found to correlate with a post- to pre-flight difference in connectivity between the right supramarginal gyrus and the left anterior insula. Due to the complex nature and rapid dynamics of adaptation to gravity alterations, the post-flight findings might be attributed to both the long-term microgravity exposure and to the readaptation to Earth{\textquoteright}s gravity that took place between the landing and post-flight MRI session. Nevertheless, the results have implications for the multisensory reweighting and gravitational motor system theories, generating hypotheses to be tested in future research.

}, issn = {1664-042X}, doi = {10.3389/fphys.2019.00761}, author = {Pechenkova, Ekaterina and Nosikova, Inna and Rumshiskaya, Alena and Litvinova, Liudmila and Rukavishnikov, Ilya and Mershina, Elena and Valentin Sinitsyn and Angelique Van Ombergen and Ben Jeurissen and Jillings, Steven and Laureys, Steven and Jan Sijbers and Grishin, Alexey and Chernikova, Ludmila and Naumov, Ivan and Kornilova, Ludmila and Floris L Wuyts and Tomilovskaya, Elena and Kozlovskaya, Inessa} } @article {1941, title = {Brain ventricular volume changes induced by long-duration spaceflight}, journal = {Proceedings of the National Academy of Sciences}, volume = {116}, year = {2019}, pages = {10531-10536}, abstract = {Long-duration spaceflight induces detrimental changes in human physiology due to microgravity. One example is a cephalic fluid shift. Here, we prospectively investigated the quantitative changes in cerebrospinal fluid (CSF) volume of the brain ventricular regions in space crew by means of a region of interest, observer-independent analysis on structural brain MRI scans. MRI scans were collected before the mission, shortly after and 7 mo after return to Earth. We found a significant increase in lateral and third ventricles at postflight and a trend to normalization at follow-up, but still significantly increased ventricular volumes. The observed spatiotemporal pattern of CSF compartment enlargement and recovery points to a reduced CSF resorption in microgravity as the underlying cause.Long-duration spaceflight induces detrimental changes in human physiology. Its residual effects and mechanisms remain unclear. We prospectively investigated the changes in cerebrospinal fluid (CSF) volume of the brain ventricular regions in space crew by means of a region of interest analysis on structural brain scans. Cosmonaut MRI data were investigated preflight (n = 11), postflight (n = 11), and at long-term follow-up 7 mo after landing (n = 7). Post hoc analyses revealed a significant difference between preflight and postflight values for all supratentorial ventricular structures, i.e., lateral ventricle (mean \% change {\textpm} SE = 13.3 {\textpm} 1.9), third ventricle (mean \% change {\textpm} SE = 10.4 {\textpm} 1.1), and the total ventricular volume (mean \% change {\textpm} SE = 11.6 {\textpm} 1.5) (all P \< 0.0001), with higher volumes at postflight. At follow-up, these structures did not quite reach baseline levels, with still residual increases in volume for the lateral ventricle (mean \% change {\textpm} SE = 7.7 {\textpm} 1.6; P = 0.0009), the third ventricle (mean \% change {\textpm} SE = 4.7 {\textpm} 1.3; P = 0.0063), and the total ventricular volume (mean \% change {\textpm} SE = 6.4 {\textpm} 1.3; P = 0.0008). This spatiotemporal pattern of CSF compartment enlargement and recovery points to a reduced CSF resorption in microgravity as the underlying cause. Our results warrant more detailed and longer longitudinal follow-up. The clinical impact of our findings on the long-term cosmonauts{\textquoteright} health and their relation to ocular changes reported in space travelers requires further prospective studies.}, issn = {0027-8424}, doi = {10.1073/pnas.1820354116}, url = {https://www.pnas.org/content/early/2019/05/01/1820354116}, author = {Angelique Van Ombergen and Steven Jillings and Ben Jeurissen and Tomilovskaya, Elena and Alena Rumshiskaya and Liudmila Litvinova and Nosikova, Inna and Ekaterina V. Pechenkova and Ilya Rukavishnikov and Manko, Olga and Danylichev, Sergey and R{\"u}hl, R. Maxine and Inessa B. Kozlovskaya and Stefan Sunaert and Paul M Parizel and Valentin Sinitsyn and Steven S L Laureys and Jan Sijbers and zu Eulenburg, Peter and Floris L Wuyts} } @article {1962, title = {Cognitive Training in Young Patients With Traumatic Brain Injury: A Fixel-Based Analysis.}, journal = {Neurorehabil Neural Repair}, year = {2019}, month = {2019 Aug 16}, abstract = {Traumatic brain injury (TBI) is associated with altered white matter organization and impaired cognitive functioning. We aimed to investigate changes in white matter and cognitive functioning following computerized cognitive training. Sixteen adolescents with moderate-to-severe TBI (age 15.6 {\textpm} 1.8 years, 1.2-4.6 years postinjury) completed the 8-week BrainGames program and diffusion weighted imaging (DWI) and cognitive assessment at time point 1 (before training) and time point 2 (after training). Sixteen healthy controls (HC) (age 15.6 {\textpm} 1.8 years) completed DWI assessment at time point 1 and cognitive assessment at time point 1 and 2. Fixel-based analyses were used to examine fractional anisotropy (FA), mean diffusivity (MD), and fiber cross-section (FC) on a whole brain level and in tracts of interest. Patients with TBI showed cognitive impairments and extensive areas with decreased FA and increased MD together with an increase in FC in the body of the corpus callosum and left superior longitudinal fasciculus (SLF) at time point 1. Patients improved significantly on the inhibition measure at time point 2, whereas the HC group remained unchanged. No training-induced changes were observed on the group level in diffusion metrics. Exploratory correlations were found between improvements on verbal working memory and reduced MD of the left SLF and between increased performance on an information processing speed task and increased FA of the right precentral gyrus. Results are indicative of positive effects of BrainGames on cognitive functioning and provide preliminary evidence for neuroplasticity associated with cognitive improvements following cognitive intervention in TBI.}, issn = {1552-6844}, doi = {10.1177/1545968319868720}, author = {Verhelst, Helena and Giraldo, Diana and Vander Linden, Catharine and Vingerhoets, Guy and Ben Jeurissen and Caeyenberghs, Karen} } @conference {Morez2019-uz, title = {A comparison of response function tensor models for multi-tissue spherical deconvolution}, volume = {32 (Suppl. 1)}, year = {2019}, pages = {S138{\textendash}S139}, author = {Jan Morez and Jan Sijbers and Ben Jeurissen} } @conference {1984, title = {A deep learning approach to T1 mapping in quantitative MRI}, volume = {32 (Suppl. 1)}, number = {S09.05}, year = {2019}, publisher = {Magn Reson Mater Phy}, abstract = {Quantitative MRI aims to measure biophysical tissue parameters through the analysis of the MR signal. Conventional parameter estimation methods, which often rely on a voxel-wise mapping, ignores spatial redundancies. In this work, a deep learning method for T1 mapping is proposed to overcome this limitation.}, doi = {10.1007/s10334-019-00754-2}, author = {Ribeiro Sabidussi, Emanoel and Michele Nicastro and Shabab Bazrafkan and Quinten Beirinckx and Ben Jeurissen and Jan Sijbers and Arnold Jan den Dekker and Stefan Klein and Dirk H J Poot} } @article {1776, title = {Diffusion MRI fiber tractography of the brain}, journal = {NMR in Biomedicine}, year = {2019}, doi = {10.1002/nbm.3785}, author = {Ben Jeurissen and Maxime Descoteaux and Susumu Mori and Alexander Leemans} } @conference {Jillings2019-al, title = {Diffusion-weighted imaging reveals structural brain changes in cosmonauts after long-duration spaceflight}, volume = {32 (Suppl. 1)}, year = {2019}, pages = {Magn Reson Mater Phy. 2019; 32(Suppl. 1):S101}, author = {Jillings, S and Angelique Van Ombergen and Tomilovskaya, E and Laureys, S and zu Eulenburg, P and Stefan Sunaert and Jan Sijbers and Floris L Wuyts and Ben Jeurissen} } @conference {Jeurissen2019-sb, title = {Improved precision and accuracy in q-space trajectory imaging by model-based super-resolution reconstruction}, year = {2019}, pages = {556}, author = {Ben Jeurissen and Westin, Carl-Fredrik and Jan Sijbers and Szczepankiewicz, Filip} } @article {1963, title = {MRtrix3: A fast, flexible and open software framework for medical image processing and visualisation.}, journal = {Neuroimage}, year = {2019}, month = {2019 Aug 29}, pages = {116137}, abstract = {

MRtrix3 is an open-source, cross-platform software package for medical image processing, analysis and visualization, with a particular emphasis on the investigation of the brain using diffusion MRI. It is implemented using a fast, modular and flexible general-purpose code framework for image data access and manipulation, enabling efficient development of new applications, whilst retaining high computational performance and a consistent command-line interface between applications. In this article, we provide a high-level overview of the features of the MRtrix3 framework and general-purpose image processing applications provided with the software.

}, issn = {1095-9572}, doi = {10.1016/j.neuroimage.2019.116137}, author = {Tournier, J-Donald and Smith, Robert and Raffelt, David and Tabbara, Rami and Dhollander, Thijs and Pietsch, Maximilian and Christiaens, Daan and Ben Jeurissen and Yeh, Chun-Hung and Connelly, Alan} } @conference {Wuyts2019-xr, title = {Novel insight on effect and recovery of long-duration spaceflight on the ventricles of the space traveller{\textquoteright}s brain}, volume = {2019}, year = {2019}, pages = {IAC{\textendash}19_A1_2_4_x51230}, publisher = {International Astronautical Federation}, author = {Floris L Wuyts and Jillings, Steven and Angelique Van Ombergen and Ben Jeurissen and Tomilovskaya, Elena and Rumshiskaya, Alena and Litvinova, Liudmila and Nosikova, Inna and Pechenkova, Ekaterina and Rukavishnikov, Ilya and others} } @article {1909, title = {Reproducibility and intercorrelation of graph theoretical measures in structural brain connectivity networks}, journal = {Medical Image Analysis}, volume = {52}, year = {2019}, pages = {56-67}, doi = {https://doi.org/10.1016/j.media.2018.10.009}, author = {Timo Roine and Ben Jeurissen and Daniele Perrone and Jan Aelterman and Wilfried Philips and Jan Sijbers and Alexander Leemans} } @conference {2020, title = {Robust outlier detection for diffusion kurtosis MRI based on IRLLS}, volume = {32}, number = {1}, year = {2019}, url = {https://link.springer.com/article/10.1007/s10334-019-00756-0}, author = {Vincenzo Anania and Thibo Billiet and Ben Jeurissen and Jan Sijbers and Arnold Jan den Dekker} } @conference {Dhondt2019-jv, title = {Structural adaptations of cognitive emotional brain regions are linked to endogenous pain modulation: a psychophysical and brain imaging study in healthy people and in low back pain}, year = {2019}, pages = {399}, author = {Dhondt, E and Ben Jeurissen and Danneels, L and Van Oosterwijck, J} } @conference {1983, title = {Super-resolution T1 mapping with integrated motion compensation in a joint maximum likelihood framework}, volume = {32 (Suppl. 1)}, number = {S14.05}, year = {2019}, publisher = {Magn Reson Mater Phy}, abstract = {To date, 3D high resolution (HR) quantitative T1 mapping is not feasible in clinical practice due to prohibitively long acquisition times. Recent work has shown that super-resolution reconstruction (SRR), in which a 3D HR T1 map is directly estimated from a set of low through-plane resolution (LR) multi-slice (ms) T1-weighted (T1w) images with different slice orientations, can improve the trade-off between SNR, spatial resolution, and acquisition time. In that work, however, inter-image motion compensation for SRR is performed in a preprocessing step in which the transformation parameters of each LR image are updated after image registration. As a result, potential registration errors might propagate in the T1 estimation as no feedback mechanism is in place. Moreover, due to missing subvoxel accuracy no HR information is readily available during preprocessing. In the current work, we explore the potential of an improved SRR T1 mapping method that aims at more accurate T1 maps by combining T1 and motion estimation in a joint Maximum Likelihood estimation (jMLE) framework. }, doi = {10.1007/s10334-019-00754-2}, author = {Quinten Beirinckx and Ben Jeurissen and Marleen Verhoye and Arnold Jan den Dekker and Jan Sijbers} } @conference {2022, title = {Voxelwise harmonisation of FA on a cohort of 605 healthy subjects using ComBat: an exploratory study}, year = {2019}, author = {Maira Siqueira Pinto and Roberto Paolella and Thibo Billiet and Pieter Van Dyck and Pieter-Jan Guns and Ben Jeurissen and Annemie Ribbens and Arnold Jan den Dekker and Jan Sijbers} } @article {1908, title = {Brain Tissue{\textendash}Volume Changes in Cosmonauts}, journal = {New England Journal of Medicine}, volume = {379}, year = {2018}, pages = {1678 - 1680}, issn = {0028-4793}, doi = {10.1056/NEJMc1809011}, url = {http://www.nejm.org/doi/10.1056/NEJMc1809011}, author = {Angelique Van Ombergen and Steven Jillings and Ben Jeurissen and Tomilovskaya, Elena and R{\"u}hl, Maxine and Alena Rumshiskaya and Nosikova, Inna and Liudmila Litvinova and Annen, Jitka and Ekaterina V. Pechenkova and Inessa B. Kozlovskaya and Stefan Sunaert and Paul M Parizel and Valentin Sinitsyn and Steven S L Laureys and Jan Sijbers and zu Eulenburg, Peter and Floris L Wuyts} } @conference {1949, title = {Changes in intrinsic functional brain connectivity after first-time exposure to parabolic flight}, year = {2018}, doi = {10.3389/conf.fphys.2018.26.00017}, author = {Angelique Van Ombergen and Floris L Wuyts and Ben Jeurissen and Jan Sijbers and Floris Vanhevel and Steven Jillings and Paul M Parizel and Stefan Sunaert and Paul H Van de Heyning and Vincent Dousset and Steven S L Laureys and Athena Demertzi} } @article {1820, title = {Diffusion kurtosis imaging with free water elimination: a Bayesian estimation approach}, journal = {Magnetic Resonance in Medicine}, volume = {80}, year = {2018}, pages = {802-813}, doi = {10.1002/mrm.27075}, author = {Quinten Collier and Jelle Veraart and Ben Jeurissen and Floris Vanhevel and Pim Pullens and Paul M Parizel and Arnold Jan den Dekker and Jan Sijbers} } @article {1843, title = {Modeling brain dynamics in brain tumor patients using The Virtual Brain}, journal = {eNeuro}, year = {2018}, abstract = {Presurgical planning for brain tumor resection aims at delineating eloquent tissue in the vicinity of the lesion to spare during surgery. To this end, non-invasive neuroimaging techniques such as functional MRI and diffusion weighted imaging fiber tracking are currently employed. However, taking into account this information is often still insufficient, as the complex non-linear dynamics of the brain impede straightforward prediction of functional outcome after surgical intervention. Large-scale brain network modeling carries the potential to bridge this gap by integrating neuroimaging data with biophysically based models to predict collective brain dynamics. As a first step in this direction, an appropriate computational model has to be selected, after which suitable model parameter values have to be determined. To this end, we simulated large-scale brain dynamics in 25 brain tumor patients and 11 control subjects using The Virtual Brain, an open-source neuroinformatics platform. Local and global model parameters of the Reduced Wong-Wang model were individually optimized and compared between brain tumor patients and control subjects. In addition, the relationship between model parameters and structural network topology and cognitive performance was assessed. Results showed (1) significantly improved prediction accuracy of individual functional connectivity when using individually optimized model parameters; (2) local model parameters can differentiate between regions directly affected by a tumor, regions distant from a tumor, and regions in a healthy brain; and (3) interesting associations between individually optimized model parameters and structural network topology and cognitive performance.}, doi = {10.1101/265637}, url = {https://www.biorxiv.org/content/early/2018/05/07/265637}, author = {Aerts, Hannelore and Schirner, Michael and Ben Jeurissen and Van Roost, Dirk and Eric Achten and Ritter, Petra and Marinazzo, Daniele} } @article {1786, title = {The role of whole-brain diffusion MRI as a tool for studying human in vivo cortical segregation based on a measure of neurite density}, journal = {Magnetic Resonance in Medicine}, volume = {79}, year = {2018}, pages = {2738{\textendash}2744}, keywords = {Brain, cortex, Diffusion MRI, fiber orientation distribution, myeloarchitecture, parcellation}, issn = {1522-2594}, doi = {10.1002/mrm.26917}, url = {http://dx.doi.org/10.1002/mrm.26917}, author = {Fernando Calamante and Ben Jeurissen and Robert Elton Smith and Tournier, Jacques-Donald and Connelly, Alan} } @conference {Jeurissen2018-af, title = {Spherical deconvolution of diffusion MRI data with tensor-valued encodings}, year = {2018}, pages = {1559}, author = {Ben Jeurissen and Szczepankiewicz, Filip} } @conference {Dhondt2018-hg, title = {Structural alterations of cognitive emotional brain regions are linked to the presence of spinal sensitization in low back pain}, year = {2018}, author = {Dhondt, Evy and Ben Jeurissen and Danneels, Lieven and Van Oosterwijck, Jessica} } @conference {Jeurissen2018-zz, title = {Super-resolution for spherical deconvolution of multi-shell diffusion MRI data}, year = {2018}, pages = {36}, author = {Ben Jeurissen and Ramos-Llord{\'e}n, Gabriel and Vanhevel, Floris and Paul M Parizel and Jan Sijbers} } @conference {Van_Dyck2018-st, title = {Super-resolution Reconstruction of Knee MRI}, year = {2018}, pages = {5184}, author = {Pieter Van Dyck and Vanhevel, F and De Smet, E and Paul M Parizel and Jan Sijbers and Ben Jeurissen} } @article {1865, title = {A three-dimensional digital neurological atlas of the mustached bat (Pteronotus parnellii)}, journal = {NeuroImage}, volume = {183}, year = {2018}, pages = {300-313}, issn = {10538119}, doi = {10.1016/j.neuroimage.2018.08.013}, url = {https://linkinghub.elsevier.com/retrieve/pii/S1053811918307110https://api.elsevier.com/content/article/PII:S1053811918307110?httpAccept=text/xmlhttps://api.elsevier.com/content/article/PII:S1053811918307110?httpAccept=text/plain}, author = {Washington, Stuart D. and Hamaide, Julie and Ben Jeurissen and Gwendolyn Van Steenkiste and Toon Huysmans and Jan Sijbers and Deleye, Steven and Kanwal, Jagmeet S. and De Groof, Geert and Liang, Sayuan and Johan Van Audekerke and Wenstrup, Jeffrey J. and Annemie Van Der Linden and Radtke-Schuller, Susanne and Marleen Verhoye} } @article {1824, title = {White matter microstructural organization of interhemispheric pathways predicts different stages of bimanual coordination learning in young and older adults}, journal = {European Journal of Neuroscience }, volume = {47}, year = {2018}, pages = {446{\textendash}459}, doi = {10.1111/ejn.13841}, author = {Hamed Zivari Adab and Sima Chalavi and Iseult Beets and Jolien Gooijers and Inge Leunissen and Boris Cheval and Quinten Collier and Jan Sijbers and Ben Jeurissen and S. P. Swinnen and Matthieu Boisgontier} } @article {1752, title = {Altered functional brain connectivity in patients with visually induced dizziness}, journal = {NeuroImage: Clinical}, volume = {14}, year = {2017}, pages = {538{\textendash}545}, doi = {http://dx.doi.org/10.1016/j.nicl.2017.02.020}, author = {Angelique Van Ombergen and Lizette Heine and Steven Jillings and Edward Roberts and Ben Jeurissen and V. Van Rompaey and Viviana Mucci and Stefanie Vanhecke and Jan Sijbers and Floris Vanhevel and Stefan Sunaert and Mohamed Ali Bahri and Paul M Parizel and Paul H Van de Heyning and Steven S L Laureys and Floris L Wuyts} } @article {1915, title = {The arcuate fasciculus network and verbal deficits in psychosis}, journal = {Translational Neuroscience}, volume = {8}, year = {2017}, month = {Feb-11-2017}, pages = {117-126}, doi = {10.1515/tnsci-2017-0018}, author = {Kenney, Joanne P.M. and McPhilemy, Genevieve and Scanlon, Cathy and Najt, Pablo and McInerney, Shane and Arndt, Sophia and Scherz, Elisabeth and Byrne, Fintan and Alexander Leemans and Ben Jeurissen and Hallahan, Brian and McDonald, Colm and Cannon, Dara M.} } @conference {Adnan2017-uz, title = {The chronification of pain: are peripheral muscle dysfunction linked to central alteration in the brain}, year = {2017}, author = {Adnan, Rahmat and Dhondt, Evy and Danneels, Lieven and Hodges, Paul and Ben Jeurissen and Van Oosterwijck, Jessica} } @conference {Adnan2017-sq, title = {The chronification of pain : are peripheral muscle dysfunctions linked to central alteration in the brain?}, year = {2017}, author = {Adnan, Rahmat and Dhondt, Evy and Danneels, Lieven and Hodges, Paul and Ben Jeurissen and Van Oosterwijck, Jessica} } @conference {Van_Dyck2017-jo, title = {Diffusion Tensor Imaging of the Anterior Cruciate Ligament Graft}, year = {2017}, pages = {377}, author = {Pieter Van Dyck and De Smet, Eline and Froeling, Martijn and Verdonk, Peter and Torfs, Micha{\"e}l and Pim Pullens and Jan Sijbers and Paul M Parizel and Ben Jeurissen} } @article {1744, title = {Diffusion Tensor Imaging of the Anterior Cruciate Ligament Graft}, journal = {Journal of Magnetic Resonance Imaging}, volume = {46}, year = {2017}, pages = {1423{\textendash}1432}, doi = {10.1002/jmri.25666}, author = {Pieter Van Dyck and Martijn Froeling and Eline De Smet and Pim Pullens and Micha{\"e}l Torfs and Peter Verdonck and Jan Sijbers and Paul M Parizel and Ben Jeurissen} } @article {1756, title = {The effect of spaceflight and microgravity on the human brain}, journal = {Journal of Neurology}, volume = {246}, year = {2017}, pages = {18-22}, doi = {10.1007/s00415-017-8427-x}, author = {Angelique Van Ombergen and Athena Demertzi and Elena Tomilovskaya and Ben Jeurissen and Jan Sijbers and Inessa B. Kozlovskaya and Paul M Parizel and Paul H Van de Heyning and Stefan Sunaert and Steven S L Laureys and Floris L Wuyts} } @article {1766, title = { Exploring sex differences in the adult zebra finch brain: In vivo diffusion tensor imaging and ex vivo super-resolution track density imaging}, journal = {NeuroImage}, volume = {146}, year = {2017}, pages = {789-803}, doi = {10.1016/j.neuroimage.2016.09.067}, author = {Hamaide, Julie and G. De Groof and Gwendolyn Van Steenkiste and Ben Jeurissen and Johan Van Audekerke and Maarten Naeyaert and Van Ruijssevelt, Lisbeth and Cornil, Charlotte and Jan Sijbers and Marleen Verhoye and Annemie Van Der Linden} } @conference {Giraldo2017-nq, title = {Fixel-Based Analysis of Alzheimer{\textquoteright}s Disease Using Multi-Tissue Constrained Spherical Deconvolution of Multi-Shell Diffusion MRI}, year = {2017}, pages = {400}, author = {Giraldo, Diana and Struyfs, Hanne and Raffelt, David and Paul M Parizel and Sebastiaan Engelborghs and Romero, Eduardo and Jan Sijbers and Ben Jeurissen} } @mastersthesis {1777, title = {Improved reliability of fiber orientation estimation and graph theoretical analysis of structural brain networks with diffusion MRI}, volume = {Doctor of Science}, year = {2017}, school = {University of Antwerp}, type = {PhD thesis}, author = {Timo Roine} } @article {1762, title = {Intrinsic connectivity reduces in vestibular-related regions after first-time exposure to short-term gravitational alterations}, journal = {Scientific Reports}, volume = {7}, year = {2017}, doi = {10.1038/s41598-017-03170-5}, author = {Angelique Van Ombergen and Floris L Wuyts and Ben Jeurissen and Jan Sijbers and Floris Vanhevel and Steven Jillings and Paul M Parizel and Stefan Sunaert and Paul H Van de Heyning and Vincent Dousset and Steven S L Laureys and Athena Demertzi} } @conference {1794, title = {Spherical Deconvolution of Non-Spherically Sampled Diffusion MRI Data}, year = {2017}, author = {Jan Morez and Jan Sijbers and Ben Jeurissen} } @conference {Morez2017-he, title = {Spherical Deconvolution of Non-Spherically Sampled Diffusion MRI Data}, year = {2017}, pages = {66}, author = {Jan Morez and Jan Sijbers and Ben Jeurissen} } @conference {1826, title = {Super-resolution multi-PLD PCASL: a simulation study}, volume = {30 (Suppl. 1)}, number = {S396}, year = {2017}, publisher = {Magn Reson Mater Phy}, abstract = {Cerebral blood flow (CBF) can be estimated non-invasively with arterial spin labeling (ASL). Multi-post-labeling-delay (PLD) pseudo-continuous ASL (PCASL) allows for accurate CBF estimation by sampling the dynamic perfusion signal at different PLDs and fitting a model to the perfusion data. Unfortunately, ASL difference images have a low SNR. Therefore, CBF estimation in multi-PLD PCASL is imprecise, unless a large number of images is acquired (long scan time) or spatial resolution is lowered significantly. It has been shown that model-based super-resolution reconstruction (SRR) techniques can improve the trade-off between SNR, spatial resolution and acquisition time. The results presented in this work show the promising potential of SRR ASL to outperform conventional ASL readout schemes in terms of achievable precision of HR perfusion measurements in a given acquisition time.}, doi = {10.1007/s10334-017-0634-z}, author = {Piet Bladt and Quinten Beirinckx and Gwendolyn Van Steenkiste and Ben Jeurissen and Eric Achten and Arnold Jan den Dekker and Jan Sijbers} } @article {1668, title = {Super-resolution T1 estimation: quantitative high resolution T1 mapping from a set of low resolution T1 weighted images with different slice orientations}, journal = {Magnetic Resonance in Medicine}, volume = {77}, year = {2017}, pages = {1818{\textendash}1830}, doi = {10.1002/mrm.26262}, author = {Gwendolyn Van Steenkiste and Dirk H J Poot and Ben Jeurissen and Arnold Jan den Dekker and Floris Vanhevel and Paul M Parizel and Jan Sijbers} } @article {1706, title = {A unified Maximum Likelihood framework for simultaneous motion and T1 estimation in quantitative MR T1 mapping}, journal = {IEEE Transactions on Medical Imaging}, volume = {36}, year = {2017}, pages = {433 - 446}, doi = {10.1109/TMI.2016.2611653}, author = {Gabriel Ramos-Llord{\'e}n and Arnold Jan den Dekker and Gwendolyn Van Steenkiste and Ben Jeurissen and Floris Vanhevel and Johan Van Audekerke and Marleen Verhoye and Jan Sijbers} } @article {1584, title = {Cortical reorganization in an astronaut{\textquoteright}s brain after long-duration spaceflight}, journal = {Brain Structure and Function}, volume = {221}, year = {2016}, pages = {2873{\textendash}2876}, doi = {10.1007/s00429-015-1054-3}, author = {Athena Demertzi and Angelique Van Ombergen and Elena Tomilovskaya and Ben Jeurissen and Ekaterina V. Pechenkova and Carol Di Perri and Liudmila Litvinova and Enrico Amico and Alena Rumshiskaya and Ilya Rukavishnikov and Jan Sijbers and Valentin Sinitsyn and Inessa B. Kozlovskaya and Stefan Sunaert and Paul M Parizel and Paul H Van de Heyning and Steven S L Laureys and Floris L Wuyts} } @article {1651, title = {D-BRAIN: Anatomically Accurate Simulated Diffusion MRI Brain Data}, journal = {PlosOne}, volume = {11}, number = {3}, year = {2016}, pages = {1-23}, doi = {10.1371/journal.pone.0149778}, author = {Daniele Perrone and Ben Jeurissen and Jan Aelterman and Timo Roine and Jan Sijbers and Aleksandra Pizurica and Alexander Leemans and Wilfried Philips} } @conference {Van_Steenkiste2016-fy, title = {High Resolution Diffusion Tensor Reconstruction from Simultaneous Multi-Slice Acquisitions in a Clinically Feasible Scan Time}, year = {2016}, pages = {2}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Baete, Steven and Arnold Jan den Dekker and Dirk H J Poot and Boada, Fernando and Jan Sijbers} } @conference {1642, title = {In vivo high resolution diffusion tensor imaging in a clinically acceptable scan time by combining super resolution reconstruction with simultaneous multi-slice acquisition}, volume = {8}, number = {P-036}, year = {2016}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Steven Baete and Arnold Jan den Dekker and Dirk H J Poot and Fernando Boada and Jan Sijbers} } @conference {Kenney2016-ju, title = {Lateralisation of the arcuate fasciculus in psychosis \& the role in verbal learning \& auditory verbal hallucinations}, volume = {26}, year = {2016}, pages = {S76{\textendash}S77}, publisher = {Elsevier Science Bv}, address = {Po Box 211, 1000 Ae Amsterdam, Netherlands}, author = {Kenney, J and McInerney, S and McPhilemy, G and Najt, P and Scanlon, C and Arndt, S and Scherz, E and Byrne, F and Leemans, A and Ben Jeurissen and Donohoe, G and Hallahan, B and McDonald, C and Cannon, D} } @conference {Roine2016-je, title = {Methodological Considerations on Graph Theoretical Analysis of Structural Brain Networks}, year = {2016}, pages = {3437}, author = {Roine, Timo and Ben Jeurissen and Perrone, Daniele and Jan Aelterman and Philips, Wilfried and Jan Sijbers and Leemans, Alexander} } @article {kenney2016p, title = {P. 3.033 Lateralisation of the arcuate fasciculus in psychosis \& the role in verbal learning \& auditory verbal hallucinations}, journal = {European Neuropsychopharmacology}, volume = {26}, year = {2016}, pages = {S76{\textendash}S77}, author = {Kenney, J and McInerney, S and McPhilemy, G and Najt, P and Scanlon, C and Arndt, S and Scherz, E and Byrne, F and Alexander Leemans and Ben Jeurissen and G Donohoe and B Hallahan and C McDonald and D Cannon} } @conference {1672, title = {Robust DKI parameter estimation in case of CSF partial volume effects}, year = {2016}, abstract = {Diffusion kurtosis imaging (DKI) suffers from partial volume effects caused by cerebrospinal fluid (CSF). We propose a DKI+CSF model combined with a framework to robustly estimate the DKI parameters. Since the estimation problem is ill-conditioned, a Bayesian estimation approach with a shrinkage prior is incorporated. Both simulation and real data experiments suggest that the use of this prior leads to a more accurate, precise and robust estimation of the DKI+CSF model parameters. Finally, we show that not correcting for the CSF compartment can lead to severe biases in the parameter estimations.}, author = {Quinten Collier and Arnold Jan den Dekker and Ben Jeurissen and Jan Sijbers} } @conference {Collier2016-tu, title = {Robust DKI Parameter Estimation in Case of CSF Partial Volume Effects}, year = {2016}, pages = {1044}, author = {Collier, Quinten and Arnold Jan den Dekker and Ben Jeurissen and Jan Sijbers} } @conference {1671, title = {A robust framework for combined estimation of DKI and CSF partial volume fraction parameters}, year = {2016}, abstract = {Diffusion kurtosis imaging (DKI) suffers from partial volume effects caused by cerebrospinal fluid (CSF). We propose a DKI+CSF model combined with a framework to robustly estimate the DKI parameters. Since the estimation problem is ill-conditioned, a Bayesian estimation approach with a shrinkage prior is incorporated. Both simulation and real data experiments suggest that the use of this prior leads to a more accurate, precise and robust estimation of the DKI+CSF model parameters. Finally, we show that not correcting for the CSF compartment can lead to severe biases in the parameter estimations.}, author = {Quinten Collier and Arnold Jan den Dekker and Ben Jeurissen and Jan Sijbers} } @mastersthesis {1713, title = {Super-resolution estimation of quantitative MRI parameters}, volume = {Doctor of Science}, year = {2016}, school = {University of Antwerp}, type = {PhD thesis}, author = {Gwendolyn Van Steenkiste} } @article {1536, title = {Super-resolution reconstruction of diffusion parameters from diffusion-weighted images with different slice orientations}, journal = {Magnetic Resonance in Medicine}, volume = {75}, year = {2016}, pages = {181-195}, doi = {10.1002/mrm.25597}, url = {http://onlinelibrary.wiley.com/doi/10.1002/mrm.25597/abstract}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Jelle Veraart and Arnold Jan den Dekker and Paul M Parizel and Dirk H J Poot and Jan Sijbers} } @article {1690, title = {T1 relaxometry of crossing fibres in the human brain.}, journal = {NeuroImage}, year = {2016}, month = {07/2016}, abstract = {A comprehensive tract-based characterisation of white matter should include the ability to quantify myelin and axonal attributes irrespective of the complexity of fibre organisation within the voxel. Recently, a new experimental framework that combines inversion recovery and diffusion MRI, called inversion recovery diffusion tensor imaging (IR-DTI), was introduced and applied in an animal study. IR-DTI provides the ability to assign to each unique fibre population within a voxel a specific value of the longitudinal relaxation time, T1, which is a proxy for myelin content. Here, we apply the IR-DTI approach to the human brain in vivo on 7 healthy subjects for the first time. We demonstrate that the approach is able to measure differential tract properties in crossing fibre areas, reflecting the different myelination of tracts. We also show that tract-specific T1 has less inter-subject variability compared to conventional T1 in areas of crossing fibres, suggesting increased specificity to distinct fibre populations. Finally we show in simulations that changes in myelination selectively affecting one fibre bundle in crossing fibre areas can potentially be detected earlier using IR-DTI.}, issn = {1095-9572}, doi = {10.1016/j.neuroimage.2016.07.037}, author = {Silvia De Santis and Yaniv Assaf and Ben Jeurissen and Derek K. Jones and Roebroeck, Alard} } @conference {1599, title = {Assessing inter-subject variability of white matter response functions used for constrained spherical deconvolution}, volume = {23}, year = {2015}, pages = {2834}, author = {Ben Jeurissen and Jan Sijbers and Jacques-Donald Tournier} } @conference {Van_Steenkiste2015-va, title = {Combination of super-resolution reconstruction diffusion tensor imaging and track density imaging reveals song control system connectivity in zebra finches}, year = {2015}, pages = {2861}, author = {Gwendolyn Van Steenkiste and Hamaide, Julie and Ben Jeurissen and Dirk H J Poot and Johan Van Audekerke and Jan Sijbers and Verhoye, Marleen} } @conference {1598, title = {Combination of super-resolution reconstruction diffusion tensor imaging and track density imaging reveals song control system connectivity in zebra finches}, volume = {23}, year = {2015}, pages = {2861}, author = {Gwendolyn Van Steenkiste and Hamaide, Julie and Ben Jeurissen and Dirk H J Poot and Johan Van Audekerke and Jan Sijbers and Marleen Verhoye} } @conference {1624, title = {CSF partial volume modeling in diffusion kurtosis imaging: a comparative parameter estimation study}, year = {2015}, month = {11/2015}, doi = {10.3389/conf.fninf.2015.19.00039}, url = {http://www.frontiersin.org/myfrontiers/events/abstractdetails.aspx?abs_doi=10.3389/conf.fninf.2015.19.00039}, author = {Quinten Collier and Jelle Veraart and Arnold Jan den Dekker and Ben Jeurissen and Jan Sijbers} } @article {perrone2015effect, title = {The effect of Gibbs ringing artifacts on measures derived from diffusion MRI}, journal = {NeuroImage}, volume = {120}, year = {2015}, pages = {441{\textendash}455}, publisher = {Academic Press}, author = {Daniele Perrone and Jan Aelterman and Pi{\.z}urica, Aleksandra and Ben Jeurissen and Wilfried Philips and Alexander Leemans} } @conference {Van_Ombergen2015-nk, title = {A first insight in regional brain changes after parabolic flight: a voxel-based morphometry study}, year = {2015}, pages = {1258}, author = {Angelique Van Ombergen and Ben Jeurissen and Vanhevel, Floris and Loeckx, Dirk and Dousset, Vincent and Paul M Parizel and Floris L Wuyts} } @conference {1633, title = {High resolution diffusion tensor imaging in a clinically feasible scan time}, year = {2015}, doi = {10.3389/conf.fninf.2015.19.00016}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Steven Baete and Arnold Jan den Dekker and Dirk H J Poot and Fernando Boada and Jan Sijbers} } @inproceedings {1548, title = {High resolution T1 estimation from multiple low resolution magnetic resonance images}, booktitle = {IEEE International Symposium on Biomedical Imaging (ISBI): From nano to macro}, volume = {12}, year = {2015}, pages = {1036-1039}, doi = {10.1109/ISBI.2015.7164048}, author = {Gwendolyn Van Steenkiste and Dirk H J Poot and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @conference {1660, title = {Human In Vivo Myeloarchitecture Using Whole-Brain Diffusion MRI}, year = {2015}, pages = {1679}, address = {Toronto, Ontario, Canada}, author = {Fernando Calamante and Ben Jeurissen and Robert Elton Smith and Jacques-Donald Tournier and Alan Connelly} } @article {1519, title = {Informed constrained spherical deconvolution (iCSD)}, journal = {Medical Image Analysis}, volume = {24}, year = {2015}, pages = {269{\textendash}281}, type = {Original research}, chapter = {269}, abstract = {Diffusion-weighted (DW) magnetic resonance imaging (MRI) is a noninvasive imaging method, which can be used to investigate neural tracts in the white matter (WM) of the brain. However, the voxel sizes used in DW-MRI are relatively large, making DW-MRI prone to significant partial volume effects (PVE). These PVEs can be caused both by complex (e.g. crossing) WM fiber configurations and non-WM tissue, such as gray matter (GM) and cerebrospinal fluid. High angular resolution diffusion imaging methods have been developed to correctly characterize complex WM fiber configurations, but significant non-WM PVEs are also present in a large proportion of WM voxels. In constrained spherical deconvolution (CSD), the full fiber orientation distribution function (fODF) is deconvolved from clinically feasible DW data using a response function (RF) representing the signal of a single coherently oriented population of fibers. Non-WM PVEs cause a loss of precision in the detected fiber orientations and an emergence of false peaks in CSD, more prominently in voxels with GM PVEs. We propose a method, informed CSD (iCSD), to improve the estimation of fODFs under non-WM PVEs by modifying the RF to account for non-WM PVEs locally. In practice, the RF is modified based on tissue fractions estimated from high-resolution anatomical data. Results from simulation and in-vivo bootstrapping experiments demonstrate a significant improvement in the precision of the identified fiber orientations and in the number of false peaks detected under GM PVEs. Probabilistic whole brain tractography shows fiber density is increased in the major WM tracts and decreased in subcortical GM regions. The iCSD method significantly improves the fiber orientation estimation at the WM-GM interface, which is especially important in connectomics, where the connectivity between GM regions is analyzed.}, keywords = {Connectomics, constrained spherical deconvolution, Diffusion MRI, fiber orientation, gray matter, partial volume effect, Response function, Tractography}, doi = {10.1016/j.media.2015.01.001}, url = {http://www.sciencedirect.com/science/article/pii/S1361841515000080}, author = {Timo Roine and Ben Jeurissen and Daniele Perrone and Jan Aelterman and Wilfried Philips and Alexander Leemans and Jan Sijbers} } @conference {1661, title = {Inversion Recovery DTI In Vivo at 7T in the Human Brain}, year = {2015}, pages = {567}, address = {Toronto, Ontario, Canada}, author = {Silvia De Santis and Ben Jeurissen and Derek K. Jones and Yaniv Assaf and Alard Roebroek} } @article {roine2015isotropic, title = {Isotropic non-white matter partial volume effects in constrained spherical deconvolution}, journal = {Information-based methods for neuroimaging: analyzing structure, function and dynamics}, year = {2015}, pages = {112}, publisher = {Frontiers Media SA}, author = {Timo Roine and Ben Jeurissen and Daniele Perrone and Jan Aelterman and Alexander Leemans and Wilfried Philips and Jan Sijbers} } @article {1492, title = {Iterative Reweighted Linear Least Squares for Accurate, Fast, and Robust Estimation of Diffusion Magnetic Resonance Parameters}, journal = {Magnetic Resonance in Medicine}, volume = {73}, year = {2015}, pages = {2174{\textendash}2184}, abstract = {Purpose: Diffusion-weighted magnetic resonance imaging suffers from physiological noise, such as artifacts caused by motion or system instabilities. Therefore, there is a need for robust diffusion parameter estimation techniques. In the past, several techniques have been proposed, including RESTORE and iRESTORE. However, these techniques are based on nonlinear estimators and are consequently computationally intensive. Method: In this work, we present a new, robust, iteratively reweighted linear least squares (IRLLS) estimator. IRLLS performs a voxel-wise identification of outliers in diffusion-weighted magnetic resonance images, where it exploits the natural skewness of the data distribution to become more sensitive to both signal hyperintensities and signal dropouts. Results: Both simulations and real data experiments were conducted to compare IRLLS with other state-of-the-art techniques. While IRLLS showed no significant loss in accuracy or precision, it proved to be substantially faster than both RESTORE and iRESTORE. In addition, IRLLS proved to be even more robust when considering the overestimation of the noise level or when the signal-to-noise ratio is low. Conclusion: The substantially shortened calculation time in combination with the increased robustness and accuracy, make IRLLS a practical and reliable alternative to current state-of-theart techniques for the robust estimation of diffusion-weighted magnetic resonance parameters.}, keywords = {diffusion tensor imaging, MRI, outlier detection, robust, weighted linear least squares}, doi = {10.1002/mrm.25351}, author = {Quinten Collier and Jelle Veraart and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @conference {Jeurissen2015-ge, title = {Processing multi-shell diffusion MRI data using MRtrix3}, year = {2015}, publisher = {Frontiers in Neuroinformatics}, author = {Ben Jeurissen} } @conference {jeurissen2015processing, title = {Processing multi-shell diffusion MRI data using MRtrix3}, year = {2015}, author = {Ben Jeurissen} } @article {forde2015structural, title = {Structural brain network analysis in families multiply affected with bipolar I disorder}, journal = {Psychiatry Research: Neuroimaging}, volume = {234}, number = {1}, year = {2015}, pages = {44{\textendash}51}, publisher = {Elsevier}, author = {Forde, Natalie J and O{\textquoteright}Donoghue, Stefani and Scanlon, Cathy and Louise Emsell and Chaddock, Chris and Alexander Leemans and Ben Jeurissen and Gareth J. Barker and Dara M. Cannon and Murray, Robin M and others} } @conference {1520, title = {Super-resolution structural connectivity and anatomy of the zebra finch brain }, year = {2015}, author = {Gwendolyn Van Steenkiste and Hamaide, Julie and Ben Jeurissen and Dirk H J Poot and Johan Van Audekerke and Jan Sijbers and Marleen Verhoye} } @conference {1596, title = {Super-resolution T1 mapping: a simulation study}, volume = {23}, year = {2015}, pages = {1679}, author = {Gwendolyn Van Steenkiste and Dirk H J Poot and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @conference {Collier2015-pa, title = {Theoretical study of the free water elimination model}, volume = {15}, year = {2015}, pages = {2757}, author = {Collier, Quinten and Veraart, Jelle and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @conference {1544, title = {Theoretical study of the free water elimination model}, year = {2015}, pages = {78}, abstract = {Partial volume effects caused by cerebrospinal fluid are an important issue in diffusion MRI. In this work, we study the free water elimination model by analyzing the Cram{\'e}r-Rao lower bound (CRLB) of its parameters. We show that through optimizing the acquisition protocol by minimizing the trace of the CRLB, a significant gain in the precision of the parameter estimation can be achieved. Moreover, further analysis indicates that regularization and/or constraints are necessary for parameter estimation from voxels with large CSF fractions and/or low FA values. These theoretical findings are confirmed by both simulation and real data experiments.}, author = {Quinten Collier and Jelle Veraart and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @conference {1545, title = {Theoretical study of the free water elimination model}, volume = {23}, year = {2015}, pages = {2757}, abstract = {Partial volume effects caused by cerebrospinal fluid are an important issue in diffusion MRI. In this work, we study the free water elimination model by analyzing the Cram{\'e}r-Rao lower bound (CRLB) of its parameters. We show that through optimizing the acquisition protocol by minimizing the trace of the CRLB, a significant gain in the precision of the parameter estimation can be achieved. Moreover, further analysis indicates that regularization and/or constraints are necessary for parameter estimation from voxels with large CSF fractions and/or low FA values. These theoretical findings are confirmed by both simulation and real data experiments.}, author = {Quinten Collier and Jelle Veraart and Ben Jeurissen and Arnold Jan den Dekker and Jan Sijbers} } @conference {1662, title = {Time to Move On: An FOD-Based DEC Map to Replace DTI{\textquoteright}s Trademark DEC FA}, year = {2015}, pages = {1027}, author = {Thijs Dhollander and Robert Elton Smith and Jacques-Donald Tournier and Ben Jeurissen and Alan Connelly} } @conference {1595, title = {Tissue-type segmentation using non-negative matrix factorization of multi-shell diffusion-weighted MRI images}, volume = {23}, year = {2015}, pages = {349}, author = {Ben Jeurissen and Jacques-Donald Tournier and Jan Sijbers} } @article {1484, title = {Automated correction of improperly rotated diffusion gradient orientations in diffusion-weighted MRI}, journal = {Medical Image Analysis}, volume = {18}, number = {7}, year = {2014}, pages = {953-962}, doi = { 10.1016/j.media.2014.05.012}, author = {Ben Jeurissen and Alexander Leemans and Jan Sijbers} } @conference {1474, title = {Brain Tissue Types Resolved Using Spherical Deconvolution of Multi-Shell Diffusion MRI Data}, year = {2014}, month = {May}, pages = {973}, address = {Milan, Italy}, author = {Ben Jeurissen and Jacques-Donald Tournier and Thijs Dhollander and Alan Connelly and Jan Sijbers} } @conference {roine2014ismrm, title = {Improving fiber orientation estimation in constrained spherical deconvolution under non-white matter partial volume effects}, year = {2014}, month = {05/2014}, pages = {4492}, author = {Timo Roine and Ben Jeurissen and Wilfried Philips and Alexander Leemans and Jan Sijbers} } @conference {1443, title = {Isotropic non-white matter partial volume effects in constrained spherical deconvolution}, year = {2014}, author = {Timo Roine and Ben Jeurissen and Wilfried Philips and Alexander Leemans and Jan Sijbers} } @article {roine2014frontiers, title = {Isotropic non-white matter partial volume effects in constrained spherical deconvolution}, journal = {Frontiers in Neuroinformatics}, volume = {8}, number = {28}, year = {2014}, month = {03/2014}, pages = {1-9}, publisher = {Frontiers}, type = {Original Research}, abstract = {Diffusion-weighted (DW) magnetic resonance imaging (MRI) is a noninvasive imaging method, which can be used to investigate neural tracts in the white matter (WM) of the brain. Significant partial volume effects (PVE) are present in the DW signal due to relatively large voxel sizes. These PVEs can be caused by both non-WM tissue, such as gray matter (GM) and cerebrospinal fluid (CSF), and by multiple nonparallel WM fiber populations. High angular resolution diffusion imaging (HARDI) methods have been developed to correctly characterize complex WM fiber configurations, but to date, many of the HARDI methods do not account for non-WM PVEs. In this work, we investigated the isotropic PVEs caused by non-WM tissue in WM voxels on fiber orientations extracted with constrained spherical deconvolution (CSD). Experiments were performed on simulated and real DW-MRI data. In particular, simulations were performed to demonstrate the effects of varying the diffusion weightings, signal-to-noise ratios (SNR), fiber configurations, and tissue fractions. Our results show that the presence of non-WM tissue signal causes a decrease in the precision of the detected fiber orientations and an increase in the detection of false peaks in CSD. We estimated 35-50 \% of WM voxels to be affected by non-WM PVEs. For HARDI sequences, which typically have a relatively high degree of diffusion weighting, these adverse effects are most pronounced in voxels with GM PVEs. The non-WM PVEs become severe with 50 \% GM volume for maximum spherical harmonics orders of 8 and below, and already with 25 \% GM volume for higher orders. In addition, a low diffusion weighting or SNR increases the effects. The non-WM PVEs may cause problems in connectomics, where reliable fiber tracking at the WM-GM interface is especially important. We suggest acquiring data with high diffusion-weighting 2500-3000 s/mm2, reasonable SNR (~30) and using lower SH orders in GM contaminated regions to minimize the non-WM PVEs in CSD. }, keywords = {constrained spherical deconvolution, Diffusion MRI, fiber orientation, gray matter, partial volume effect}, doi = {10.3389/fninf.2014.00028}, url = {http://journal.frontiersin.org/Journal/10.3389/fninf.2014.00028/abstract}, author = {Timo Roine and Ben Jeurissen and Daniele Perrone and Jan Aelterman and Alexander Leemans and Wilfried Philips and Jan Sijbers} } @article {1494, title = {Multi-tissue constrained spherical deconvolution for improved analysis of multi-shell diffusion MRI data}, journal = {NeuroImage}, volume = {103}, year = {2014}, pages = {411{\textendash}426}, abstract = {Constrained spherical deconvolution (CSD) has become one of the most widely used methods to extract white matter (WM) fibre orientation information from diffusion-weighted MRI (DW-MRI) data, overcoming the crossing fibre limitations inherent in the diffusion tensor model. It is routinely used to obtain high quality fibre orientation distribution function (fODF) estimates and fibre tractograms and is increasingly used to obtain apparent fibre density (AFD) measures. Unfortunately, CSD typically only supports data acquired on a single shell in q-space. With multi-shell data becoming more and more prevalent, there is a growing need for CSD to fully support such data. Furthermore, CSD can only provide high quality fODF estimates in voxels containing WM only. In voxels containing other tissue types such as grey matter (GM) and cerebrospinal fluid (CSF), the WM response function may no longer be appropriate and spherical deconvolution produces unreliable, noisy fODF estimates. The aim of this study is to incorporate support for multi-shell data into the CSD approach as well as to exploit the unique b-value dependencies of the different tissue types to estimate a multi-tissue ODF. The resulting approach is dubbed multi-shell, multi-tissue CSD (MSMT-CSD) and is compared to the state-of-the-art single-shell, single-tissue CSD (SSST-CSD) approach. Using both simulations and real data, we show that MSMT-CSD can produce reliable WM/GM/CSF volume fraction maps, directly from the DW data, whereas SSST-CSD has a tendency to overestimate the WM volume in voxels containing GM and/or CSF. In addition, compared to SSST-CSD, MSMT-CSD can substantially increase the precision of the fODF fibre orientations and reduce the presence of spurious fODF peaks in voxels containing GM and/or CSF. Both effects translate into more reliable AFD measures and tractography results with MSMT-CSD compared to SSST-CSD.}, doi = {10.1016/j.neuroimage.2014.07.061}, author = {Ben Jeurissen and Jacques-Donald Tournier and Thijs Dhollander and Alan Connelly and Jan Sijbers} } @conference {1559, title = {A Novel Method for Realistic DWI Data Generation}, volume = {22}, year = {2014}, pages = {4427}, address = {Milan, Italy}, author = {Daniele Perrone and Jan Aelterman and Ben Jeurissen and Aleksandra Pizurica and Wilfried Philips and Jan Sijbers} } @article {1547, title = {Recursive calibration of the fiber response function for spherical deconvolution of diffusion MRI data.}, journal = {NeuroImage}, volume = {86}, year = {2014}, month = {2014 Feb 1}, pages = {67-80}, abstract = {There is accumulating evidence that at current acquisition resolutions for diffusion-weighted (DW) MRI, the vast majority of white matter voxels contains "crossing fibers", referring to complex fiber configurations in which multiple and distinctly differently oriented fiber populations exist. Spherical deconvolution based techniques are appealing to characterize this DW intra-voxel signal heterogeneity, as they provide a balanced trade-off between constraints on the required hardware performance and acquisition time on the one hand, and the reliability of the reconstructed fiber orientation distribution function (fODF) on the other hand. Recent findings, however, suggest that an inaccurate calibration of the response function (RF), which represents the DW signal profile of a single fiber orientation, can lead to the detection of spurious fODF peaks which, in turn, can have a severe impact on tractography results. Currently, the computation of this RF is either model-based or estimated from selected voxels that have a fractional anisotropy (FA) value above a predefined threshold. For both approaches, however, there are user-defined settings that affect the RF and, consequently, fODF estimation and tractography. Moreover, these settings still rely on the second-rank diffusion tensor, which may not be the appropriate model, especially at high b-values. In this work, we circumvent these issues for RF calibration by excluding "crossing fibers" voxels in a recursive framework. Our approach is evaluated with simulations and applied to in vivo and ex vivo data sets with different acquisition settings. The results demonstrate that with the proposed method the RF can be calibrated in a robust and automated way without needing to define ad-hoc FA threshold settings. Our framework facilitates the use of spherical deconvolution approaches in data sets in which it is not straightforward to define RF settings a priori.}, keywords = {Adult, Algorithms, Brain, Calibration, diffusion tensor imaging, Humans, Image Enhancement, Image Interpretation, Computer-Assisted, Imaging, Three-Dimensional, Male, Nerve Fibers, Myelinated, Pattern Recognition, Automated, Reproducibility of Results, Sensitivity and Specificity}, issn = {1095-9572}, doi = {10.1016/j.neuroimage.2013.07.067}, author = {Chantal M W Tax and Ben Jeurissen and Vos, Sjoerd B. and Viergever, Max A. and Alexander Leemans} } @conference {1554, title = {Structural brain network analysis in families multiply affected with bipolar 1 disorder}, year = {2014}, address = {Athens, Greece}, author = {Forde, Natalie J and Scanlon, Cathy and Louise Emsell and O{\textquoteright}Donoghue, S and Chaddock, Chris and Alexander Leemans and Ben Jeurissen and Dara M. Cannon and Murray, R M and Colm McDonald} } @article {1546, title = {Structural neuroimaging correlates of allelic variation of the BDNF val66met polymorphism.}, journal = {NeuroImage}, volume = {90}, year = {2014}, month = {2014 Apr 15}, pages = {280-9}, abstract = {BACKGROUND: The brain-derived neurotrophic factor (BDNF) val66met polymorphism is associated with altered activity dependent secretion of BDNF and a variable influence on brain morphology and cognition. Although a met-dose effect is generally assumed, to date the paucity of met-homozygotes have limited our understanding of the role of the met-allele on brain structure. METHODS: To investigate this phenomenon, we recruited sixty normal healthy subjects, twenty in each genotypic group (val/val, val/met and met/met). Global and local morphology were assessed using voxel based morphometry and surface reconstruction methods. White matter organisation was also investigated using tract-based spatial statistics and constrained spherical deconvolution tractography. RESULTS: Morphological analysis revealed an "inverted-U" shaped profile of cortical changes, with val/met heterozygotes most different relative to the two homozygous groups. These results were evident at a global and local level as well as in tractography analysis of white matter fibre bundles. CONCLUSION: In contrast to our expectations, we found no evidence of a linear met-dose effect on brain structure, rather our results support the view that the heterozygotic BDNF val66met genotype is associated with cortical morphology that is more distinct from the BDNF val66met homozygotes. These results may prove significant in furthering our understanding of the role of the BDNF met-allele in disorders such as Alzheimer{\textquoteright}s disease and depression.}, keywords = {Adolescent, Adult, Alleles, Brain, Brain-Derived Neurotrophic Factor, diffusion tensor imaging, Female, Genotype, Heterozygote, Homozygote, Humans, Image Processing, Computer-Assisted, Male, Middle Aged, Polymorphism, Single Nucleotide, Young Adult}, issn = {1095-9572}, doi = {10.1016/j.neuroimage.2013.12.050}, author = {Forde, Natalie J and Ronan, Lisa and Suckling, John and Scanlon, Cathy and Neary, Simon and Holleran, Laurena and Alexander Leemans and Tait, Roger and Rua, Catarina and Fletcher, Paul C and Ben Jeurissen and Dodds, Chris M and Miller, Sam R and Bullmore, Edward T and Colm McDonald and Nathan, Pradeep J and Dara M. Cannon} } @conference {1483, title = {Super-resolution reconstruction of diffusion parameters from multi-oriented diffusion weighted images}, year = {2014}, month = {May}, address = {Milan, Italy}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Paul M Parizel and Dirk H J Poot and Jan Sijbers} } @conference {1482, title = {Super-resolution reconstruction of diffusion parameters from multi-oriented diffusion weighted images}, year = {2014}, month = {january}, address = {Maastricht, The Netherlands}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Dirk H J Poot and Paul M Parizel and Jan Sijbers} } @conference {1433, title = {Analysis and modeling of isotropic partial volume effects in diffusion MRI}, volume = {7}, year = {2013}, month = {2013}, doi = {10.3389/conf.fninf.2013.10.00027}, author = {Timo Roine and Ben Jeurissen and Alexander Leemans and Wilfried Philips and Jan Sijbers} } @conference {1389, title = {How to make sure you are using the correct gradient orientations in your diffusion MRI study?}, year = {2013}, month = {April}, pages = {2047}, address = {Salt Lake City, USA}, author = {Ben Jeurissen and Alexander Leemans and Jan Sijbers} } @article {1348, title = {Investigating the prevalence of complex fiber configurations in white matter tissue with diffusion magnetic resonance imaging.}, journal = {Human Brain Mapping}, volume = {34}, number = {11}, year = {2013}, pages = {2747-66}, abstract = {It has long been recognized that the diffusion tensor model is inappropriate to characterize complex fiber architecture, causing tensor-derived measures such as the primary eigenvector and fractional anisotropy to be unreliable or misleading in these regions. There is however still debate about the impact of this problem in practice. A recent study using a Bayesian automatic relevance detection (ARD) multicompartment model suggested that a third of white matter (WM) voxels contain crossing fibers, a value that, whilst already significant, is likely to be an underestimate. The aim of this study is to provide more robust estimates of the proportion of affected voxels, the number of fiber orientations within each WM voxel, and the impact on tensor-derived analyses, using large, high-quality diffusion-weighted data sets, with reconstruction parameters optimized specifically for this task. Two reconstruction algorithms were used: constrained spherical deconvolution (CSD), and the ARD method used in the previous study. We estimate the proportion of WM voxels containing crossing fibers to be \~{}90\% (using CSD) and 63\% (using ARD). Both these values are much higher than previously reported, strongly suggesting that the diffusion tensor model is inadequate in the vast majority of WM regions. This has serious implications for downstream processing applications that depend on this model, particularly tractography, and the interpretation of anisotropy and radial/axial diffusivity measures.}, issn = {1097-0193}, doi = {10.1002/hbm.22099}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Derek K. Jones and Jan Sijbers} } @article {1368, title = {Limbic and callosal white matter changes in euthymic bipolar I disorder: an advanced diffusion MRI tractography study}, journal = {Biologicial Psychiatry}, volume = {73}, year = {2013}, pages = {194-201}, doi = {http://dx.doi.org/10.1016/j.biopsych.2012.09.023}, author = {Louise Emsell and Alexander Leemans and Camilla Langan and Wim Van Hecke and Gareth J. Barker and Peter McCarthy and Ben Jeurissen and Jan Sijbers and Stefan Sunaert and Dara M. Cannon and Colm McDonald} } @conference {1557, title = {Recursive calibration of the fiber response function for spherical deconvolution diffusion ODF sharpening}, year = {2013}, address = {Podstrana, Croatia}, author = {Chantal M W Tax and Ben Jeurissen and Vos, Sjoerd B. and Viergever, Max A. and Alexander Leemans} } @conference {1556, title = {Robust fiber response function estimation for deconvolution based diffusion MRI methods}, volume = {21}, year = {2013}, pages = {3149}, address = {Salt Lake City, Utah}, author = {Chantal M W Tax and Ben Jeurissen and Viergever, Max A. and Alexander Leemans} } @conference {1555, title = {Robust fiber response function estimation for deconvolution based diffusion MRI methods}, volume = {5}, year = {2013}, pages = {55}, address = {Rotterdam, The Netherlands}, author = {Chantal M W Tax and Ben Jeurissen and Viergever, Max A. and Alexander Leemans} } @conference {1384, title = {Super resolution reconstruction from differently oriented diffusion tensor data sets}, year = {2013}, month = {January}, address = {Rotterdam, The Netherlands}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Jan Sijbers and Dirk H J Poot} } @conference {1385, title = {Super resolution reconstruction from differently oriented diffusion tensor data sets}, year = {2013}, month = {April}, pages = {3186}, address = {Salt Lake City, USA}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Jan Sijbers and Dirk H J Poot} } @conference {1425, title = {Super resolution reconstruction of diffusion tensor parameters from multi-oriented diffusion weighted images}, year = {2013}, author = {Gwendolyn Van Steenkiste and Ben Jeurissen and Dirk H J Poot and Jan Sijbers} } @article {1328, title = {Super-Resolution for Multislice Diffusion Tensor Imaging}, journal = {Magnetic Resonance in Medicine}, volume = {69}, year = {2013}, pages = {103{\textendash}113}, abstract = {Diffusion weighted (DW) magnetic resonance images are often recorded with single shot multislice imaging sequences, because of their short scanning times and robustness to motion. To minimize noise and acquisition time, images are generally acquired with either anisotropic or isotropic low resolution voxels, which impedes subsequent posterior image processing and visualization. In this paper, we propose a super-resolution method for diffusion weighted imaging that combines anisotropic multislice images to enhance the spatial resolution of diffusion tensor (DT) data. Each DW image is reconstructed from a set of arbitrarily oriented images with a low through-plane resolution. The quality of the reconstructed DW images was evaluated by DT metrics and tractography. Experiments with simulated data, a hardware DTI phantom, as well as in vivo human brain data were conducted. Our results show a significant increase in spatial resolution of the DT data while preserving high signal to noise ratio.}, doi = {10.1002/mrm.24233}, author = {Dirk H J Poot and Ben Jeurissen and Yannick Bastiaensen and Jelle Veraart and Wim Van Hecke and Paul M Parizel and Jan Sijbers} } @article {1397, title = {Weighted linear least squares estimation of diffusion MRI parameters: Strengths, limitations, and pitfalls.}, journal = {NeuroImage}, volume = {81}, year = {2013}, month = {2013 May 16}, pages = {335-346}, abstract = {PURPOSE: Linear least squares estimators are widely used in diffusion MRI for the estimation of diffusion parameters. Although adding proper weights is necessary to increase the precision of these linear estimators, there is no consensus on how to practically define them. In this study, the impact of the commonly used weighting strategies on the accuracy and precision of linear diffusion parameter estimators is evaluated and compared with the nonlinear least squares estimation approach. METHODS: Simulation and real data experiments were done to study the performance of the weighted linear least squares estimators with weights defined by (a) the squares of the respective noisy diffusion-weighted signals; and (b) the squares of the predicted signals, which are reconstructed from a previous estimate of the diffusion model parameters. RESULTS: The negative effect of weighting strategy (a) on the accuracy of the estimator was surprisingly high. Multi-step weighting strategies yield better performance and, in some cases, even outperformed the nonlinear least squares estimator. CONCLUSION: If proper weighting strategies are applied, the weighted linear least squares approach shows high performance characteristics in terms of accuracy/precision and may even be preferred over nonlinear estimation methods.}, issn = {1095-9572}, doi = {10.1016/j.neuroimage.2013.05.028}, author = {Jelle Veraart and Jan Sijbers and Stefan Sunaert and Alexander Leemans and Ben Jeurissen} } @conference {1558, title = {{\textquotedblleft}The weighted linear least squares for estimating diffusion (kurtosis) tensors: Revisited}, year = {2013}, address = {Podstrana, Croatia}, author = {Jelle Veraart and Jan Sijbers and Stefan Sunaert and Alexander Leemans and Ben Jeurissen} } @conference {1341, title = {Assessing the implications of complex fiber configurations for DTI metrics in real data sets}, year = {2012}, month = {May}, pages = {3584}, address = {Melbourne, Australia}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Derek K. Jones and Jan Sijbers} } @conference {1340, title = {HARDI-based methods for fiber orientation estimation}, year = {2012}, note = {Received the Summa Cum Laude Merit Award for the 20th Annual ISMRM meeting.}, month = {May}, pages = {3585}, address = {Melbourne, Australia}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Jan Sijbers} } @article {1349, title = {Identification and characterization of Huntington related pathology: an in vivo DKI imaging study}, journal = {NeuroImage}, volume = {63}, year = {2012}, month = {09/2012}, pages = {653-662}, doi = {http://dx.doi.org/10.1016/j.neuroimage.2012.06.032}, author = {Ines Blockx and Marleen Verhoye and Johan Van Audekerke and Irene Bergwerf and Jack X Kane and Rafael Delgado Y Palacios and Jelle Veraart and Ben Jeurissen and Kerstin Raber and Von H{\"o}rsten, Stephan and Peter Ponsaerts and Jan Sijbers and Trygve B Leergaard and Annemie Van Der Linden} } @mastersthesis {1337, title = {Improved analysis of brain connectivity using high angular resolution diffusion MRI}, volume = {PhD in Sciences}, year = {2012}, month = {03/2012}, pages = {208}, school = {University of Antwerp}, type = {PhD thesis}, keywords = {complex WM architecture, constrained spherical deconvolution, crossing fibers, CSD, Diffusion MRI, diffusion tensor imaging, DTI, HARDI, high angular resolution diffusion imaging, Magnetic Resonance Imaging, MRI, probabilistic tractography, Spherical deconvolution, Tractography, white matter, WM}, author = {Ben Jeurissen} } @article {1516, title = {Improved sensitivity to cerebral white matter abnormalities in Alzheimer{\textquoteright}s disease with spherical deconvolution based tractography.}, journal = {PloS one}, volume = {7}, year = {2012}, month = {2012}, pages = {e44074}, abstract = {Diffusion tensor imaging (DTI) based fiber tractography (FT) is the most popular approach for investigating white matter tracts in vivo, despite its inability to reconstruct fiber pathways in regions with "crossing fibers." Recently, constrained spherical deconvolution (CSD) has been developed to mitigate the adverse effects of "crossing fibers" on DTI based FT. Notwithstanding the methodological benefit, the clinical relevance of CSD based FT for the assessment of white matter abnormalities remains unclear. In this work, we evaluated the applicability of a hybrid framework, in which CSD based FT is combined with conventional DTI metrics to assess white matter abnormalities in 25 patients with early Alzheimer{\textquoteright}s disease. Both CSD and DTI based FT were used to reconstruct two white matter tracts: one with regions of "crossing fibers," i.e., the superior longitudinal fasciculus (SLF) and one which contains only one fiber orientation, i.e. the midsagittal section of the corpus callosum (CC). The DTI metrics, fractional anisotropy (FA) and mean diffusivity (MD), obtained from these tracts were related to memory function. Our results show that in the tract with "crossing fibers" the relation between FA/MD and memory was stronger with CSD than with DTI based FT. By contrast, in the fiber bundle where one fiber population predominates, the relation between FA/MD and memory was comparable between both tractography methods. Importantly, these associations were most pronounced after adjustment for the planar diffusion coefficient, a measure reflecting the degree of fiber organization complexity. These findings indicate that compared to conventionally applied DTI based FT, CSD based FT combined with DTI metrics can increase the sensitivity to detect functionally significant white matter abnormalities in tracts with complex white matter architecture.}, keywords = {Aged, 80 and over, Alzheimer Disease, Cerebrum, Cognition, Corpus Callosum, diffusion tensor imaging, Female, Humans, Male, Memory, Nerve Fibers, Myelinated}, issn = {1932-6203}, doi = {10.1371/journal.pone.0044074}, author = {Reijmer, Yael D and Alexander Leemans and Heringa, Sophie M and Wielaard, Ilse and Ben Jeurissen and Koek, Huiberdina L and Biessels, Geert Jan} } @article {1336, title = {The influence of complex white matter architecture on the mean diffusivity in diffusion tensor MRI of the human brain}, journal = {NeuroImage}, volume = {59}, year = {2012}, month = {2/2012}, pages = {2208 - 2216}, issn = {10538119}, doi = {10.1016/j.neuroimage.2011.09.086}, author = {Vos, Sjoerd B. and Derek K. Jones and Ben Jeurissen and Viergever, Max A. and Alexander Leemans} } @conference {1552, title = {Constrained spherical deconvolution based tractography and cognition in Alzheimer{\textquoteright}s disease}, year = {2011}, address = {Paris, France}, author = {Reijmer, Yael D and Alexander Leemans and Heringa, Sophie M and Wielaard, Ilse and Ben Jeurissen and Koek, Huiberdina L and Biessels, Geert Jan} } @conference {1549, title = {Constrained spherical deconvolution based tractography and cognition in Alzheimer{\textquoteright}s disease}, volume = {5}, year = {2011}, address = {Lille, France}, author = {Reijmer, Yael D and Alexander Leemans and Heringa, Sophie M and Wielaard, Ilse and Ben Jeurissen and Koek, Huiberdina L and Biessels, Geert Jan} } @conference {1551, title = {Constrained spherical deconvolution based tractography and cognition in Alzheimer{\textquoteright}s disease}, year = {2011}, address = {Qu{\'e}bec, Canada}, author = {Reijmer, Yael D and Alexander Leemans and Heringa, Sophie M and Wielaard, Ilse and Ben Jeurissen and Koek, Huiberdina L and Biessels, Geert Jan} } @conference {bjeurissM.aleemansjsijbers2011, title = {Correction of DWI gradient orientations using registration techniques}, year = {2011}, month = {January}, author = {Ben Jeurissen and Maarten Naeyaert and Alexander Leemans and Jan Sijbers} } @conference {1550, title = {Diffusion tensor imaging and cognition in Alzheimer{\textquoteright}s disease: the influence of crossing fibers}, year = {2011}, address = {Lunteren, The Netherlands}, author = {Wielaard, Ilse and Reijmer, Yael D and Alexander Leemans and Heringa, Sophie M and Ben Jeurissen and Koek, Huiberdina L and Biessels, Geert Jan} } @conference {M.J.bjeurissP.J.K.J.aleemans2011, title = {Fiber architecture of the female pelvic floor: An exploratory investigation using different diffusion MRI tractography algorithms}, year = {2011}, month = {May}, address = {Montreal, Canada}, author = {Martijn Froeling and Strijkers G. J. and Ben Jeurissen and van der Paardt M. P. and J. Stoker and K. Nicolay and A. J. Nederveen and Alexander Leemans} } @article {jrajanbjeurissmverhoyeJ.jsijbers2011, title = {Maximum likelihood estimation based denoising of magnetic resonance images using restricted local neighborhoods}, journal = {Physics in Medicine and Biology}, volume = {56}, number = {16}, year = {2011}, pages = {5221-5234}, doi = {doi:10.1088/0031-9155/56/16/009}, author = {Jeny Rajan and Ben Jeurissen and Marleen Verhoye and Johan Van Audekerke and Jan Sijbers} } @article {jveraartB.T.wvheckeI.bjeurissY.avdlindeA.mverhoyejsijbers2011, title = {Population-averaged diffusion tensor imaging atlas of the Sprague Dawley rat brain}, journal = {NeuroImage}, volume = {58}, year = {2011}, pages = {975-983}, doi = {10.1016/j.neuroimage.2011.06.063}, author = {Jelle Veraart and Trygve B Leergaard and Antonsen, Bj{\o}rnar T and Wim Van Hecke and Ines Blockx and Ben Jeurissen and Yi Jiang and Annemie Van Der Linden and Allan G Johnson and Marleen Verhoye and Jan Sijbers} } @article {1258, title = {Probabilistic fiber tracking using the residual bootstrap with constrained spherical deconvolution}, journal = {Human Brain Mapping}, volume = {32}, year = {2011}, month = {March, 2011}, pages = {461 - 479}, keywords = {Diffusion MRI, Spherical deconvolution, Tractography}, doi = {10.1002/hbm.21032}, author = {Ben Jeurissen and Alexander Leemans and Derek K. Jones and Jacques-Donald Tournier and Jan Sijbers} } @article {P.M.A.S.bjeurissJ.A.M.K.F.T.J.-F.C.2011, title = {Quantitative Evaluation of 10 Tractography Algorithms on a Realistic Diffusion MR Phantom}, journal = {NeuroImage}, volume = {56}, number = {1}, year = {2011}, month = {May}, pages = {220-234}, author = {Pierre Fillard and Maxime Descoteaux and Alvina Goh and Sylvain Gouttard and Ben Jeurissen and James Malcolm and Alonso Ramirez-Manzanares and Marco Reisert and Ken Sakaie and Fatima Tensaouti and Ting-Shou Yo and Jean-Fran{\c c}ois Mangin and Cyril Poupon} } @conference {bjeurissM.aleemansjsijbers2011, title = {Registration based correction of DWI gradient orientations}, year = {2011}, month = {May}, address = {Montreal, Canada}, author = {Ben Jeurissen and Maarten Naeyaert and Alexander Leemans and Jan Sijbers} } @conference {1553, title = {White Matter Tract Deficits in Schizophrenia}, volume = {7}, year = {2011}, address = {Dublin, Ireland}, author = {Forde, Natalie J and Ellison-Wright, I and Nathan, Pradeep J and Zaman, R and Dudas, R and Agius, M and Fernandez-Egea, E and Alexander Leemans and Ben Jeurissen and Scanlon, Cathy and Colm McDonald and Dara M. Cannon} } @article {wvheckeAleemanssdbackerBjeurisspmparizejsijbers2010, title = {Comparing isotropic and anisotropic smoothing for voxel-based DTI analyses: A simulation study}, journal = {Human Brain Mapping}, volume = {31}, number = {1}, year = {2010}, pages = {98-114}, author = {Wim Van Hecke and Alexander Leemans and Steve De Backer and Ben Jeurissen and Paul M Parizel and Jan Sijbers} } @conference {bjeurissaleemansdkjonesjdtournierjsijbers2010, title = {Counting the number of fiber orientations in diffusion MRI voxels using constrained spherical deconvolution}, year = {2010}, month = {January}, address = {Utrecht, The Netherlands}, author = {Ben Jeurissen and Alexander Leemans and Derek K. Jones and Jacques-Donald Tournier and Jan Sijbers} } @conference {bjeurissaleemansdkjonesjdtournierjsijbers2010, title = {Estimating the number of fiber orientations in diffusion MRI voxels: a constrained spherical deconvolution study}, year = {2010}, month = {May}, address = {Stockholm, Sweden}, author = {Ben Jeurissen and Alexander Leemans and Derek K. Jones and Jacques-Donald Tournier and Jan Sijbers} } @inproceedings {jrajanbjeurissjsijbersK.2009, title = {Denoising Magnetic Resonance Images using Fourth Order Complex Diffusion}, booktitle = {13th International Machine Vision and Image Processing Conference}, year = {2009}, pages = {123-127}, address = {Dublin, Ireland}, author = {Jeny Rajan and Ben Jeurissen and Jan Sijbers and Keizer Kannan} } @conference {aleemansbjeurissjsijbersdkjones2009, title = {ExploreDTI: A Graphical Toolbox for Processing, Analyzing, and Visualizing Diffusion MR Data}, year = {2009}, month = {April}, address = {Honolulu, USA}, author = {Alexander Leemans and Ben Jeurissen and Jan Sijbers and Derek K. Jones} } @inproceedings {bjeurissaleemansjdtournierjsijbers2009, title = {Fiber Tracking on the {\textquoteright}Fiber Cup Phantom{\textquoteright} using Constrained Spherical Deconvolution}, booktitle = {MICCAI workshop on Diffusion Modelling and the Fiber Cup (DMFC{\textquoteright}09)}, year = {2009}, address = {London, United Kingdom}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Jan Sijbers} } @conference {bjeurissaleemansjdtournierjsijbers2009, title = {Probabilistic Fiber Tracking using the Residual Bootstrap with Constrained Spherical Deconvolution MRI}, year = {2009}, month = {April}, address = {Honolulu, USA}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Jan Sijbers} } @conference {bjeurissaleemansjdtournierjsijbers2008, title = {Bootstrap methods for estimating uncertainty in Constrained Spherical Deconvolution fiber orientations}, year = {2008}, month = {May}, pages = {3324}, address = {Toronto, Canada}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Jan Sijbers} } @conference {bjeurissaleemansjdtournierjsijbers2008, title = {Can residual bootstrap reliably estimate uncertainty in fiber orientation obtained by spherical deconvolution from diffusion-weighted MRI?}, volume = {41}, year = {2008}, month = {June}, address = {Melbourne, Australia}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Jan Sijbers} } @inproceedings {bjeurissaleemansjdtournierjsijbers2008, title = {Estimation of Uncertainty in Constrained Spherical Deconvolution Fiber Orientations}, booktitle = {5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro}, year = {2008}, pages = {907-910}, address = {Paris, France}, author = {Ben Jeurissen and Alexander Leemans and Jacques-Donald Tournier and Jan Sijbers} } @conference {bjeurissaleemansefieremajsijbers2008, title = {Fiber Tractography on a Crossing Fiber Phantom using Constrained Spherical Deconvolution MRI}, year = {2008}, address = {Li{\`e}ge, Belgium}, author = {Ben Jeurissen and Alexander Leemans and Els Fieremans and Jan Sijbers} }