Hi Jessica,
I don't think this is normal. Is this a single subject? Of course in a
single subject lots of stuff can go wrong. Are the surfaces correct? And
the hippo label? Are there motion artifacts in the image etc.
Anyway, you should process this with the longitudinal stream:
http://freesurfer.net/fswiki/LongitudinalProcessing
which should increase repeatability.
Best, Martin
> _______________________________________________
On Wed, 2011-07-27 at 09:01 -0700, Jessica Liu wrote:
> Hi,
>
> We found 20% differences in temporal lobe brain volume and ca. 5%
> difference in the hippocampus volume between two data sets of a young
> normal volunteer scanned 2 days apart.
>
> We use the one-step 19 hours recon-all -all procedure and directly sum
> select values taken from the lh.aparc.stats, rh.aparc.stats, and
> wmparc.stats. The values summed were based on information given from
> https://mail.nmr.mgh.harvard.edu/pipermail/freesurfer/2007-April/005000.html
>
> My question is, are these observations normal for Freesurfer? Any
> comments are greatly appreciated. Thanks!
> --
> Pom & Jessica
>
>
>
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