Dear Liwen,

We rebuilt the atlas and there were also minor changes in the code, so the volume won’t be exactly the same.

Having said that, if you plot 6 vs dev volumes, they should be highly correlated.

Cheers,

/E

Juan Eugenio Iglesias

Senior research fellow

CMIC (UCL), MGH (HMS) and CSAIL (MIT)

http://www.jeiglesias.com 

From: <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Liwen Zhang <lw.zhang@yahoo.com>
Reply-To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Date: Sunday, 22 September 2019 at 10:40
To: "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] help! Hippocampal subfield segmentation with FS development version

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Hello freesurfer experts,

I previously applied hippocampal subfield segmentation using FS v.6.0. I am now trying to devide subfields into head/body where applicable using FS development version (latest version). However, I encountered the following problems/quesetions:

1) X represents certain subfield (volume)

X_head + X_body (from FS dev) ~= X (from FS v.6.0)

What possibly causes this volume discrepancy between FS dev and FS v.6.0? Is the head/body segmentation template in FS dev based on the same ex-vivo template as used in FS v.6.0?

2) Related to 1), subfield volume as obtained from FS v.6.0 generally larger than that from FS dev (not for all subfields though)

I processed T1 images with FS v.6.0 and then applied hippocampal segmentation with both FS v.6.0 and FS dev. 

Any suggestions/comments would be greatly appreicated! 

Thank you for your time and help in advance!

Best, 

Liwen