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Uploading the data would be great, thanks, Matthew > On 13.09.2007, at 17:39, Matthew Webster wrote: > >> We've now fixed this bug in fast4 - the corrected version will be >> in the next patch - coming soon! > > We've now retried the fast4 T1/T2/prior-probabilities segmentation > with FSL-4.0.2, and while there are no crashes any more, things > still do not work right: The whole brain gets classified as tissue > one, like in a brain mask. > > The only hint are a lot of NaN values in the log messages: > >> Beginning prior-based initialisation >> Tanaka Iteration 0 bias field 4 >> CHANNEL 1 CLASS 1 MEAN 1 STDDEV nan CLASS 2 MEAN 1 STDDEV nan >> CLASS 3 MEAN inf STDDEV nan >> CHANNEL 2 CLASS 1 MEAN 1 STDDEV nan CLASS 2 MEAN 1 STDDEV nan >> CLASS 3 MEAN 1 STDDEV nan >> Tanaka Iteration 1 bias field 4 >> CHANNEL 1 CLASS 1 MEAN nan STDDEV nan CLASS 2 MEAN nan STDDEV nan >> CLASS 3 MEAN nan STDDEV nan > > The command we used was >> fast4 --verbose -o fast4mmpp/AKYY_1_seg --outbias -a identity.mat >> --segments -S 2 AKYY_1_t1_brain_std AKYY_1_t2_brain_std > > Should I upload the data for you to have a look? > > > Regards, > Timm Wetzel