This is very helpful, Doug. Then I should the value in aseg.stats. Thank you very much.
On Mon, Sep 16, 2013 at 4:20 PM, Douglas Greve <gr...@nmr.mgh.harvard.edu>wrote: > > Hi Cherry, the total gray matter volume in aseg.stats is a combination of > the two approaches. For cortical structures, it computes the volume using > surface-based methods. The subcortical structures it uses the volume-based > method. To compute total GM, you need both. > doug > > > > On 9/16/13 9:11 PM, Yizhou Ma wrote: > > Dear Freesurfer experts, > > I'm doing ROI analysis on surface area and gray matter volume using the > aparc.2009 parcellation. Now that I wanted to use corresponding whole brain > measures as covariates, I could not find whole brain gray matter volume > measures in the aparc.a2009s.stats file. However, I find one in the > aseg.stats file. Since I believe these two file use different approaches to > estimate gray matter volume, I'm stuck with what I choose for the whole > brain measure. Do I use the value in aseg.stats or do I add up the volumes > of regions in aparc.a2009s.stats? And advice is appreciated. > > Thanks, > Cherry > > > _______________________________________________ > Freesurfer mailing > listfreesur...@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > The information in this e-mail is intended only for the person to whom it > is > addressed. If you believe this e-mail was sent to you in error and the > e-mail > contains patient information, please contact the Partners Compliance > HelpLine at > http://www.partners.org/complianceline . If the e-mail was sent to you in > error > but does not contain patient information, please contact the sender and > properly > dispose of the e-mail. > >
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