Hi Alexopoulos, See wiki page below for definition of morphometry stats.
https://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats
-Louis
On Thu, 13 Dec 2012, Alexopoulos, Dimitrios wrote:
Doug,
Thanks. When I add up all 49 fields in the aseg.stats I don't get the same number (actually larger) as the 'Brain Segmentation Volume'.
v4.4/aseg.stas also includes a 'Brain Segmentation Volume Without Ventricles'. I presume we can use this, and subtract out the CSF for total brain tissue?
Jim
From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Douglas N Greve [greve@nmr.mgh.harvard.edu] Sent: Thursday, December 13, 2012 11:34 AM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Total brain tissue volume
Hi Jim, in 4.4, the Brain Segmentation Volume is basically just an adding up of the volumes in aseg.stats, but it includes ventricles, so you would need to subtract those out. Newer versions of FS have a BrainSegVolNotVent which is the volume of tissue. doug
On 12/13/2012 12:32 PM, Alexopoulos, Dimitrios wrote:
Hi FS users,
We've generated surfaces using FS v4.4 and would like to determine total brain tissue volume for each of our cases. Would this correspond to the 'Brain Segmentation Volume' which is standard in the output aseg.stats file.
How is the 'Brain Segmentation Volume' determined, and is it different than adding up the 49 fields in the aseg.stas (subtracting out csf, ventricles, etc).
What value best represents the total brain tissue volume?
Jim
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