The answer is close to what Shashwath suggested, except that the "Hippocampus" segmentation is really computed at the same time as all the other subfields. For unfortunate reasons, the tail of the hippocampus that is not further subdivided in our manual training segmentations was called "Hippocampus" for lack of other good names - it really should have been "Part of the Hippocampus Tail that We Didn't Subdivide Manually".
If you want to compute the total volume of the hippocampus, you'll need to add the volume of this part, though.. Hope this helps, Koen On Wed, Nov 16, 2011 at 2:10 PM, Alan Francis <alandarkene...@gmail.com> wrote: > Thanks Shashwath. > > On Wed, Nov 16, 2011 at 2:04 PM, Shashwath <shashwath...@gmail.com> wrote: >> >> Alan- I believe the label "hippocampus" here refers to the remaining hippo >> segment after the algorithm has completed labelling of all subfields. In >> essence this would not be a measure that conveys very meaningful info. >> >> Sent from my iPhone >> >> On Nov 16, 2011, at 1:01 PM, Alan Francis <alandarkene...@gmail.com> >> wrote: >> >> > Hi Koen and FreeSurfers: >> > >> > I have a 3T dataset that has undergone processing using 5.1. I have also >> > run the Hippo sub fields command. Here are my results: >> > >> > [root@NeuroImage-Gamma mri]# kvlQuantifyPosteriorProbabilityImages >> > $FREESURFER_HOME/data/GEMS/compressionLookupTable.txt posterior_right_* >> > posterior_Right-Hippocampus.mgz >> > >> > volumeInVoxels: >> > right_CA1: 2473.34 >> > right_CA2-3: 7530.08 >> > right_CA4-DG: 4160.99 >> > right_fimbria: 520.14 >> > right_hippocampal_fissure: 376.772 >> > right_presubiculum: 2780.65 >> > right_subiculum: 4230.04 >> > Right-Hippocampus: 2277.69 >> > >> > My question is : Since these are "subfields" of the Hippocampus, should >> > not the sum of all subregions be equal the volume of the Right >> > Hippocampus? >> > >> > Thanks so much! >> > >> > Alan Francis >> > >> > Beth Israel Deaconess Medical Center, BOSTON >> > >> > _______________________________________________ >> > 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. > > > _______________________________________________ > 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. > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
