I have not studied the issue, but I think that BrainVolNotVent is
probably a good way to go.
On 8/24/2020 1:00 PM, Harkey, Thomas Jarrott wrote:
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Ok thank you!
If we conducted a study measuring brain to intracranial volume ratio,
do you think that BrainVolNotVent and Etiv-only ratio would provide
accurate measures? Is there another more robust way to make this
calculation using FreeSurfer?
We are studying brain atrophy in MCA stroke patients. I have seen
studies indicating there is some bias regarding etiv but that the
correlation with manual segmentations is roughly R =.8.
Is the BrainVolNotVent to Etiv-only ratio a valid estimation of
atrophy or are there statistical normalizations or corrections that
complicate that procedure?
Thank you so much for your time.
--
*Thomas Harkey **
University of Arkansas for Medical Sciences***
*College of Medicine, Class of 2022
501-553-6318*
*tjhar...@uams.edu <mailto:tjhar...@uams.edu>*
*From: *<freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of "Douglas
N. Greve" <dgr...@mgh.harvard.edu>
*Reply-To: *Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
*Date: *Monday, August 24, 2020 at 9:14 AM
*To: *"freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
*Subject: *Re: [Freesurfer] BrainSegNotVent {Disarmed}
No, you need a segmentation
On 8/23/2020 8:18 PM, Harkey, Thomas Jarrott wrote:
* External Email - Use Caution *
Will this work on the brainmask.auto.mgz if I use the
--brain-vol-from-seg command?
--
*Thomas Harkey **
University of Arkansas for Medical Sciences*
*College of Medicine, Class of 2022
501-553-6318*
*tjhar...@uams.edu <mailto:tjhar...@uams.edu>*
*From: *<freesurfer-boun...@nmr.mgh.harvard.edu>
<mailto:freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of
"Douglas N. Greve" <dgr...@mgh.harvard.edu>
<mailto:dgr...@mgh.harvard.edu>
*Reply-To: *Freesurfer support list
<freesurfer@nmr.mgh.harvard.edu>
<mailto:freesurfer@nmr.mgh.harvard.edu>
*Date: *Sunday, August 23, 2020 at 2:03 PM
*To: *"freesurfer@nmr.mgh.harvard.edu"
<mailto:freesurfer@nmr.mgh.harvard.edu>
<freesurfer@nmr.mgh.harvard.edu>
<mailto:freesurfer@nmr.mgh.harvard.edu>
*Subject: *Re: [Freesurfer] BrainSegNotVent
Actually, that file won't be there either because it does not get
created until all processing is done (not just autorecon1). You
can run mri_segststats like
mri_segstats --seg subject/mri/aseg.presurf.mgz --ctab-default
--sum subject/stats/aseg.presurf.stats
Then add up all the segmentations you want to get BrainSegNotVent
On 8/23/2020 11:42 AM, Douglas N. Greve wrote:
Are you using v7? If so, look in subject/stats/brainvol.stats
On 8/22/2020 5:39 PM, Harkey, Thomas Jarrott wrote:
* External Email - Use Caution *
Hello,
I am a student learning free surfer. I was able to obtain
intracranial volume by running
recon-all –i file.dcm –subject bert –autorecon1
and then
mri_segstats --subject bert --etiv-only
How can I obtain the BrainSegNotVent volume? I have tried
mri_segstats --subject bert --brain-vol-from-seg
however, “ERROR: must specify a segmentation volume”
Can this be calculated using the data from autorecon1, or
do I need to run -all? Which segmentation do I need to
specify?
My contact information is below,
Thank you!
--
*Thomas Harkey **
University of Arkansas for Medical Sciences*
*College of Medicine, Class of 2022
501-553-6318*
*tjhar...@uams.edu <mailto:tjhar...@uams.edu>*
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