Great! Thanks!
My subjects were ran in stable3, so they didn't have the BrainSegVolNotVent
measure in the aseg.stats. Rerunning segstats though..
Thanks again!
On Wed, 28 Nov 2007, Nick Schmansky wrote:
this wiki page has just been created to hold this info:
http://surfer.nmr.mgh.harvard.edu/fswiki/BrainVolume
On Wed, 2007-11-28 at 14:14 -0500, Doug Greve wrote:
This is from mri_segstats --help
MEASURES OF BRAIN VOLUME
There will be four measures of brain volume in the output summary file:
(1) BrainSegNotVent - sum of the volume of the structures identified in
the aseg.mgz volume this will include cerebellum but not ventricles,
CSF and dura. Includes partial volume compensation with --pv.
This is probably the number you want to report.
(2) BrainMask - total volume of non-zero voxels in brainmask.mgz. This
will
include cerebellum, ventricles, and possibly dura. This is
probably not
what you want to report.
(3) BrainSeg - sum of the volume of the structures identified in the
aseg.mgz
volume. This will include cerebellum and ventricles but should
exclude
dura. This does not include partial volume compensation, so
this number might be different than the sum of the segmentation
volumes.
(4) IntraCranialVol (ICV) - estimate of the intracranial volume based
on the
talairach transform. See surfer.nmr.mgh.harvard.edu/fswiki/eTIV
for more
details. This is the same measure as Estimated Total Intracranial
Volume
(eTIV).
Akram Bakkour wrote:
Hi all,
I want to pull the measure of whole brain volume. In the aseg.stats
there is a BrainMaskVol and a BrainSegVol. Which one do I want?
As I understand it, BrainMaskVol is the volume of the brainmask
(including the ventricles) whereas BrainSegVol is the volume of brain
matter and not including the ventricles, so I think this is the one I
want, but I want to make sure and I couldn't find a straight answer on
the wiki.
Thanks!
Akram.
--
Akram Bakkour
Gerontology Research Unit
149 13th Street, Suite 2691
Charlestown, MA 02129
tel: 617-726-5571
fax: 617-726-5760
web: http://www.dickersonlab.org
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