@article {jsijbersdpootajdendekwpintjen2007, title = {Automatic estimation of the noise variance from the histogram of a magnetic resonance image}, journal = {Physics in Medicine and Biology}, volume = {52}, number = {5}, year = {2007}, month = {February}, pages = {1335-1348}, doi = {10.1088/0031-9155/52/5/009}, author = {Jan Sijbers and Dirk H J Poot and Arnold Jan den Dekker and W. Pintjens} }