Hi Jordi,<br /><br />I think you are looking for the information contained on the wiki:<br />http://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats<br /><br /><strong>TotalGray</strong> - total gray matter volume. This is simply the sum of <span class="anchor" id="line-65"></span>SubCortGray + lhCortex + rhCortex + CerebellumGM. As such, it includes <span class="anchor" id="line-66"></span>both surface-based volume calculations and voxel counts. <br /><br />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<br /><br />Cheers,<br />Gabriel. <br type="_moz" /><div style="font-family: 'Times New Roman'; font-size: 16px;"><br /><br /><span>El 22/03/13, <b class="name">Jordi Delgado </b> &lt;jordidem@pic.es&gt; escribió:</span><blockquote cite="mid:CA+URb4DNtjmztqPYQb=wMjgvr1u-aBkYz7hr4mnqF5AgMbRO0A@mail.gmail.com" class="iwcQuote" style="border-left: 1px solid #00F; padding-left: 13px; margin-left: 0;" type="cite"><div class="mimepart text html"><div dir="ltr"><div>Dear FS experts,<br /><br /></div><div>I have a double question about the gray matter calculations in FS:<br /><br /></div><div>- 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...<br />
<br /></div><div>- How this total Gray Volume is calculated? Which structures are taken into account? Is there any file with this information<br /></div><div><br /></div>Kind Regards,<br clear="all" /><div>
<div><br />-- <br />Jordi
</div></div></div>
</div></blockquote></div><br />-- <br /><font size="3">--------------------------<br />PhD. student Gabriel González-Escamilla<br />Laboratory of Functional Neuroscience<br />Department of Physiology, Anatomy, and Cell Biology<br />University Pablo de Olavide<br />Ctra. de Utrera, Km.1<br />41013 - Seville<br />- Spain -<br /><br />Email: ggonesc@upo.es<br />http://www.upo.es/neuroaging/es/</font>