I've checked out the wiki, and it brings up a couple of other questions. I don't seem to have the BrainSegVolNoVent measure...maybe this is an issue with versions? I ran the mri_label_volume command that Bruce provided. There was roughly a 300,000 mm^3 difference between the output of the mri_label_volume and BrainSegVol (the mri_label_volume output was the smaller value). Is this to be expected? It seems to me that they should be the same, unless I am mistaken?
-----Original Message----- From: Douglas N Greve [mailto:greve@nmr.mgh.harvard.edu] Sent: Mon 4/13/2009 11:42 AM To: Dankner, Nathan (NIH/NIMH) [F] Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] total brain volumes
Did you look at the Brain Volume wiki page? To find it, go to our wiki and type in "BrainSegVol" in the search box and hit the "Text" button.
doug
Dankner, Nathan (NIH/NIMH) [F] wrote:
I think this may have slipped through the cracks, so I am posting it again. I apologize if this has been answered already. If the information is available elsewhere and I happened to miss it, please let me know.
-----Original Message----- From: Dankner, Nathan (NIH/NIMH) [F] Sent: Thu 4/9/2009 1:55 PM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] total brain volumes
I am looking to derive total brain volume measures from the data that I have. Judging by reading previous posts, it seems that BrainSegVol in aseg.stats includes cerebellum and ventricles. Is there any way to eliminate these from the calculation? Is it kosher to subtract the cerebellum/ventricle measures found elsewhere in aseg.stats/wm.parc from BrainSegVol, or are these derived differently from BrainSegVol? Secondly, would merely adding the left-cerebral-cortex to right-cerebral-cortex measures found in aseg.stats give me total brain volume? Thank you in advance,
Nathan
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