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