The surface area is the actual area of the surface. I think you may be thinking of the jacobian, which measures the amount of stretching needed to register with the surface atlas. Total cortical volume is available from the "header" of the aseg.stats file, and that is a surface-based measure. As of version 5, we stopped reporting the volume-based cortical volume measure.
doug On 9/29/10 9:57 PM, Jeff Sadino wrote: > Hello, > > As I understand it, the surface area measure is not a real surface > area measure. It is more a measure of how much the brain has to be > stretched in order to get into a common space. My question is that if > the cortical volume is calculated by multiplying the thickness and the > surface area (right?), then is it a real volume that can be compared > between subjects? > > Also, is it is more accurate to use the cortical volume measures from > the aparc files rather than the aseg files, since the aseg files > overestimate the white matter due to the manual tracing it is based > on? > > Thank you, > Jeff > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://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.
