Thank you for your answer, Doug. Cheers, Marcos Em Qua, 2013-08-07 às 19:32 -0400, Douglas N Greve escreveu:
> Hi Marcos, we're not really set up to do this kind of thing. The > subcortical structures in fsaverage are not appropriate for > surface-based analysis. We do not generate surface for subcortical > structures from individuals. I think FSL might do this kind of thing. > doug > > > > > On 08/07/2013 04:03 PM, Marcos Martins da Silva wrote: > > Hi, FreeSurfers. > > Is it possible to use FreeSurfer's group analysis tools to investigate > > surface deformation instead of thickness? I guess it would be > > interesting for subcortical structures like putamen, amygdala or > > hippocampus. Let's say you get the putamen data from 15 subjects and > > compare it to putamen data from fsaverage, After correct registration, > > I guess we can detect regions of contraction and expansion leading to > > changes in the putamen contour. I imagined it could be done if we > > calculate the signed Euclidean distances between the corresponding > > points of for each subject's putamen and fsaverage, with positive and > > negative values indicating, for example, the presence of an outward or > > inward surface deformation. After all calculation I guess we can get a > > similar result to the pictures we can see at > > http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis > > <http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis%A0> > > but showing only a putamen and the colors meaning surface deformation > > instead of thickness. This way, you can notice morphological > > differences among subjects even if they have the same volume. > > Thanks in advance, > > Marcos > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >
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