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, talairach.xfm, talairach.m3z....but it's is not clear which one I should use.
Thank you in advance!!