Hi Anthony,
For cortical gray matter volume, compute statistics using the
{lh,rh}.cortex.label file.

i.e., 
mris_anatomical_stats -l lh.cortex.label -f $subj/stats/lh.cortex.stats
$subj lh

That will be roughly similar to computing the volume difference between
the pial and white surfaces, except that the label file takes into
account that portions of the medial temporal lobe (e.g., hippocampus and
amygdala) are not cortex.

cheers,
Mike H.


On Mon, 2009-01-12 at 21:45 -0800, Anthony wrote:
> Hi all,
> 
> I'm doing some analyses which involve GM volume . It might sound
> trivial but I wonder how could GM calculation be done in freesurfer?
> Is there a way to compute it based on GM between white and pial
> surfaces, and will the result of that approach be different from using
> what is given by aseg.mgz ?
> 
> Thanks
> 
> Anthony
> 
> 
> 
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