Hi all,
I've performed FS subcortical segmentation and my purpose is to use these segmentations as seeds to another method.
As FS uses GCA atlas to perform subcortical segmentation, I want to know if the
aseg.mgz output is in GCA atlas space,
or in original space except that the dimensions are 256x256x256, 1mm.
On the other hand, I also need to convert expert segmentations in native space to GCA atlas space, that is, the inverse
of the process explained in
http://surfer.nmr.mgh.harvard.edu/fswiki/FsAnat-to-NativeAnat. I don't know if there is a command to do so,
or we have to use a transformation matrix. In the latter case, FreeSurfer creates several tranformation matrices: talairach.lta,