Mithra, We highly recommend using the same version of freesurfer to perform recon-all processing on a group of subjects. Processing with different versions introduces an extra level of variability in your study.
However, in looking at the ReleaseNotes page: https://surfer.nmr.mgh.harvard.edu/fswiki/ReleaseNotes The fixes from v4.0.0 to v4.0.1 were made to gui apps, and to fix some segfault problems unrelated to aseg processing, plus the versions are less than a month apart, so in your case, i think it ok to mix versions 4.0.0 and 4.0.1 (unless you have the cpu resources to redo them, then that is safest). Nick On Mon, 2008-02-11 at 10:55 -0600, Mithra wrote: > Hello, > > We used Freesurfer version 4.0.0 for a many of our subjects and > version 4.0.1 for the other subjects. > > Will there be a difference between both the versions. We are comparing > individual subjects brain (aseg stats) at 2 different instances. It so > happens we are comparing the same subject's brain done with version > 4.0.0 with his later structural scan analyzed with version 4.0.1. > > We are looking at the Hippocampus and Amygdala volumes. > > Thanks. > > > -- > Regards, > Mithra > > Imaging Research Center > University of Texas, Austin > 3925-B W Braker Lane > Austin. TX - 78759 > Tel: (512) 232-5725 > Fax: (512) 232-4202 > > www.irc.utexas.edu > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer