Hi Jordi,

I think you are looking for the information contained on the wiki:
http://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats

TotalGray - total gray matter volume. This is simply the sum of SubCortGray + lhCortex + rhCortex + CerebellumGM. As such, it includes both surface-based volume calculations and voxel counts.

To get a  volume.mgz for the GM, you can use matlab and the aseg.mgz, or mri_extract_label, both with the number-IDs of the corresponding labels, as found in FreeSurferColorLUT.txt

Cheers,
Gabriel.

El 22/03/13, Jordi Delgado <jordidem@pic.es> escribió:

Dear FS experts,

I have a double question about the gray matter calculations in FS:

- Revising the aseg.stats, I noticed that there is a Total Gray Volume calculation. Is there a mgz volume with the gray matter? I cannot find it on the output mri folder...

- How this total Gray Volume is calculated? Which structures are taken into account? Is there any file with this information

Kind Regards,

--
Jordi

--
--------------------------
PhD. student Gabriel González-Escamilla
Laboratory of Functional Neuroscience
Department of Physiology, Anatomy, and Cell Biology
University Pablo de Olavide
Ctra. de Utrera, Km.1
41013 - Seville
- Spain -

Email: ggonesc@upo.es
http://www.upo.es/neuroaging/es/