Jared,

In general, as Bruce pointed out, we generally highly recommend not mixing output from different versions, as it is difficult to track and guarantee 'no changes' between sub-minor release versions. But in looking at the ReleaseNotes wiki page, there were no bug fixes between v4.0.0, v4.0.2, and v4.0.5 that affected the subcortical segmentation algorithms, so the aseg.mgz files could be mixed in your case (if you just dont have the horsepower or time to rerun them with the same version).

Nick

On Thu, 2008-11-20 at 14:58 -0500, Jared Price wrote:

Hi freesurfer gurus, I just noticed that version 4.1.0 is out. We have a relatively large amount of data already processed through various freesurfer versions such as 4.0.0 4.0.2 4.0.5. Is it valid to compare volumetric measurements from the subcortical segmentation file aseg.mgz across these versions? Must we do reruns? Cheers Jared _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer