Hi Bruce,

Our subjects don't have this label (?h.cortex) in their label directories. Was this introduced with a recent version? What is the best approximation of this cortical gray matter volume measure for people who have older recons?

Cheers,

-Morgan

Hi Mike,

you need to exclude non-cortical regions (e.g. hippocampus) from the pial volume. I think mris_anatomical_stats -l $subject/label/$hemi.cortex should be the right measure.

cheers, Bruce

On Fri, 20 Apr 2007, Michael Harms wrote:

Hello FS-list,

Could you please confirm the recommended current approach for calculating the total cortical gray matter volume.

Based on the following Wiki page http://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats? action=highlight&value=mris_volume I presume that the recommended calculation (illustrated using tcsh syntax) is:

@ total_cort_gm_vol = `mris_volume ?h.pial` - `mris_volume ?h.white`

My only hesitation is that I noticed the resulting value doesn't quite match the value of "total gray matter volume" that is output by mris_anatomical_stats. Is this because mris_anatomical_stats uses a older approach that is no longer considered quite as accurate?

thanks, Mike Harms

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