Hi Sierra, the hippocampal subfield segmentation is computed using a separate model, so it doesn't agree perfectly with the hippocampal mask in aseg.mgz. In fact, the volume estimates tend to be a bit smaller (but highly correlated). Cheers, /Eugenio
On 09/30/2013 10:42 AM, Germeyan, Sierra (NIH/NINDS) [F] wrote: > Hi everyone, > > After running -hippo-subfields, I converted the voxel output of > -hippo-subfields to mm^3 based on the instructions given here: > https://mail.nmr.mgh.harvard.edu/pipermail/freesurfer/2013-June/031188.html. > Then I summed the volumes for all of the subfields (assuming that this would > give me the total hippocampal volume), and compared the sum to the > hippocampal volume that FreeSurfer gave after running recon-all -all on the > same scan. They weren't the same! Why would these differ? Or, is there > something I am doing wrong in my comparison of the two hippocampal outputs? > > Thanks for your help! > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- ------------------------------------------------------------------------------------- Juan Eugenio Iglesias, PhD http://www.jeiglesias.com igles...@nmr.mgh.harvard.edu Athinoula A. Martinos Center for Biomedical Imaging 149 Thirteenth Street, Suite 2301 Charlestown, Massachusetts 2129 U.S.A. _______________________________________________ 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.
