Hi Mehul
the entorhinal label in the aparc was drawn by Rahul based on gyral
landmarks. The one in the _exvivo.stats is based on being able to see the
layer II islands in ex vivo MRI and hence we believe it is more accurate.
Not sure why you need to integrate the ex vivo one back into the
aparc+aseg, can you clarify?
cheers
Bruce
On Tue, 29 Jan 2013, Mehul Sampat wrote:
Hi Folks,
I have a question about entorhinal cortex volume. The entorhinal cortex is
listed in ?h.aparc.stats and ?h.entorhinal_exvivo.stats. In a previous post on
the mailing list, it was mentioned that we should use the volume measurement
from ?h.entorhinal_exvivo.stats.
We would like to make manual corrections to the entorhinal cortex segmentation
(when required). For this task I can create a entorhinal volume from
?h.entorhinal_exvivo.label
using mri_label2vol
This entorhinal volume will be different from the one in aparc+aseg.mgz
My question is:
Has anyone published any protocols to somehow combine the two entorhinal
volumes ?
Or is recommend to take the take the entorhinal volume created from
?h.entorhinal_exvivo.stats.
and overlay it on norm.mgz and edit manually (when required).
One limitation of this approach is that it would be hard to integrate this
entorhinal volume back into
aparc+aseg.mgz...
Thanks
Mehul
On Wed, Dec 7, 2011 at 10:50 AM, Bruce Fischl <fis...@nmr.mgh.harvard.edu>
wrote:
Hi Catherine
I guess I would recommend the ex vivo one since it is based explicitly on
architecontics and not on guessing locations from folds.
cheers
Bruce
On Wed, 7 Dec 2011, Cat Chong wrote:
Hello experts,
I am very new to freesurfer so please excuse my basic question:
We want to get measurements of entorhinal cortex volumes on a group
of
people. I found these results listed in ?h.aparc.stats.
I also noticed another ?h.entorhinal_exvivo.stats, with different
results.
Which should I use for a group analysis of entorhinal volume and
surface
area, and why are the results very different?
very best regards,
catherine
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