Hi
What is a typical example of when the intensity normalization process fails? Does the over-all image seem brighter? What is a good indicator of success or failure?
Thanks,
Tracy
Tracy Wang
Research Assistant
Cognitive Neuroscience Laboratory
Washington University
Department of Psycholo
if it succeeds then the intensity in the wm should be exactly 110 over
much of the brain, and 90
Bruce
On Wed, 14 Sep
2005, Tracy Wang wrote:
Hi
What is a typical example of when the intensity normalization process fails?
Does the over-all image seem brighter? What is a good indicator of
Just a cuoriosity:
which kind of volumes are you using?
I had lots of troubles with 3T SPGRs and saw the center of the images just
brighter.
francesca
_
From: Tracy Wang [mailto:[EMAIL PROTECTED]
Sent: Wed 9/14/2005 1:23 PM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] intensit
I'm using 1.5T MPRAGEs. and the skull stripped T1 overall looks very bright. However the intensity for WM is between 90 and 120.
Tracy
On Sep 14, 2005, at 12:40 PM, Bagnato, Francesca (NIH/NINDS) wrote:
Just a cuoriosity:
which kind of volumes are you using?
I had lots of troubles with 3T SPG
Is it possible to obtain and intensity histogram of the wm voxels, or
descriptive stats (eg., Mean, SD) as a quick check?
-Original Message-
From: Bruce Fischl [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 15, 2005 3:33 AM
To: Tracy Wang
Cc: freesurfer@nmr.mgh.harvard.edu
Subject:
should be easy enough to do in matlab. Just load the wm volume, then find
all the T1 voxels that are nonzero in it.
Bruce
On Thu, 15 Sep 2005, Fornito,
Alexander wrote:
Is it possible to obtain and intensity histogram of the wm voxels, or
descriptive stats (eg., Mean, SD) as a quick check?
You should be able to use mri_segstats somehow. You'll need a
segmentation, though. You could tell it to report
on the aseg wm values. You could also use the fill volume (127 and
255?). Check out the --help
doug
On Wed, 14 Sep 2005, Bruce Fischl wrote:
should be easy enough to do in matlab. J
