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Hi Lucia, I've had a look at the images and I cannot see anything unusual about them. Also, when I run MRIcron on my mac laptop (intel) then the only non-zero values I see are 2007.0 which is correct - so I cannot replicate this problem. Not being an SPM user, I haven't checked that. Can you double-check that the most recent versions of MRIcron and SPM are in fact not working? I just cannot think of any reason why you should have a problem like this. All the best, Mark On 3 May 2008, at 10:05, Lucia Garrido wrote: > Dear FSL users, > > I used freesurfer to do cortical parcellation (which created aparc > +aseg.nii) > and now wanted to create a ROI in FSL. In FSL, I ran: > > fslmaths aparc+aseg.nii -thr 2007 -uthr 2007 rh_fusiform.nii > > in which 2007 corresponds to the fusiform in the aprc+aseg file. It > created > rh_fusiform.nii, in which the fusiform corresponds to intensity 2007 > and all > other regions are 0. However, when I open the same file in SPM (or > MRIcron), > the intensity within the fusiform vary between multiple values, ie, > stop > being all 2007. > > I'd be very grateful if someone could let me know why this happens, > and > suggest a way of dealing with this. > > Thank you very much. > > Best regards, > > Lucia > >