You can extract a binary mask for any structure with
mri_binarize --i aseg.mgz --match XX --o yourmask.mgh
where XX is a number from $FREESURFER_HOME/FreeSurferColorLUT.txt (eg, 
17 = left hippo)
It is possible to generate hippo surfaces, but we cannot guarantee 
accuracy. Let me know if you want to know how.
doug

Jie Shi wrote:
> Hi, experts. We need to use FreeSurfer to process some analyze image 
> data. More specifically, we want to extract the hippocampus surfaces. 
> We know that FreeSurfer has done subcortical segmentation during 
> -autorecon2 stage in recon-all. We have checked the resulting aseg.mgz 
> file and found that it contains all substructures. So we wonder if 
> there is a way to get the separated .mgz files for each substructure 
> or could FreeSurfer generate the subcortical surfaces? Thanks a lot.
>
> Best,
> Jie
> ------------------------------------------------------------------------
>
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> Freesurfer@nmr.mgh.harvard.edu
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-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358 
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html

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