@article {1600, title = {Easy implementation of advanced tomography algorithms using the ASTRA toolbox with Spot operators}, journal = {Numerical Algorithms}, volume = {71}, number = {3}, year = {2016}, pages = {673-697}, doi = {10.1007/s11075-015-0016-4}, author = {Folkert Bleichrodt and Tristan van Leeuwen and Willem Jan Palenstijn and Wim Van Aarle and Jan Sijbers and Kees Joost Batenburg} }