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 -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
