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.
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> _______________________________________________
On Nov 16, 2011, at 1:01 PM, Alan Francis <alandarkenergy@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
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