aseg.stats is created by counting the number of voxels in the aseg.mgz. Actually, it includes partial volume correction, so it won't be exactly the same as the voxel count. The ICV is an estimate only based on the talairach transform. It's hard to say why two subjects would have the same ICV. Maybe they have the same ICV or it might be an artifact of the transform. Try checking the transforms on both of them to make sure they are accurate.
doug Rebecca Dautoff wrote: > Hi all > I am relatively unfamiliar with the structural side of analysis and am > curious about how aseg.stats is created during recon. I have 2 subjects > with the same ICV but volumes for other structures are different. What are > the chances that this is just a coincidence and not an issue with the > data? Assuming there is a mistake, how is it possible for there to be a > mistake with ICV but not other structures? > > Thanks, > Becca > _______________________________________________ > 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: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
