Hi Freesurfer experts, I would like to determine brain parenchymal fraction (ie brain tissue volume/estimated ICV) as an estimate of global atrophy. In previous versions of FS, I used the BrianVolNotVent/ICV. Is this correct?
I am now using freesurfer version 5.0.0 and BrainVolNotVent is not longer available. My understanding is that the total gray matter and total cortical white matter volumes are determined from the pial and white surfaces (thickness *surface area). Do these volumes include or exclude the ventricular volumes? Can the total brain volume be calculated as the sum of the total GM, total cortical WM, brain stem, cerebellar GM and WM minus the CSF. Or do the volumes of the ventricles need to be subtracted as well? Thanks for your help. Cheryl -- Cheryl McCreary Seaman Family MR Research Centre Foothills Medical Centre 1403 29th Street NW Calgary, AB T2N 2T9 _______________________________________________ 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.
