If you visualize the segmentation (aseg.mgz) in tkmedit you can see exactly what is labeled Cerebral-White-Matter and Cerebral-Cortex based on the volume (not the surface) segmentation.

As for the "Intracranial Volume" value in the preamble of the aseg.stats file, that is a statistical estimate of the ICV, based on the determinant of the atlas transformation. Some details can be found here: http://surfer.nmr.mgh.harvard.edu/fswiki/eTIV

cheers, Mike H.

On Thu, 2009-06-11 at 15:35 -0400, Sherri Novis wrote:

Hello - can anyone tell me where I can find details on what aseg stats include and exclude from each measurement? The ones I need in particular are: Left-Cerebral-White-Matter Left-Cerebral-Cortex and IntraCranialVol. I'd like to understand if L-Cereb-Cortex means just gray matter, and/or if it includes ventricles & subcortical structures. I'm also trying to find out if IntraCanial Volume means the space of the skull cavity, or if it means something different.

Thanks much in advance - Sherri

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