If you want the pial volume, then you should not use mris_wm_volume as this excludes subcortical gray. Use mris_volume for both the white and pial, then do your subtraction.

doug

Mehul Sampat wrote:

Hi Folks,

I was trying to compute the total gray matter volume and I wanted to check if I was using the correct procedure.

I looked at the "Morphometry Stats" page for this issue (http://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats?highlight=%28gray%...)

The instructions say that:

gm volume = pial volume - white volume

My question is: to get the total pial volume, it is correct to use: mris_volume rh.pial and mris_volume lh.pial

For the white matter volume I am using mris_wm_volume <subject> <hemi>

Thanks Mehul _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer