Here is a fragment of the help text for recon-all which pointed me towards this:
WM/GM Contrast (-<no>pctsurfcon)
Computes the vertex-by-vertex percent contrast between white and gray matter.
The computation is:
100*(W-G)
pct = ---------
0.5*(W+G)
The white matter is sampled 1mm below the white surface. The gray matter is
sampled 30% the thickness into the cortex. The volume that is sampled is
rawavg.mgz. The output is stored in the surf dir of the given subject as
?h.w-g.pct.mgh. Non-cortical regions (medial wall) are zeroed.
It is this “pct” value along with the coordinates of the vertex that I am interested in.
Regards,
Don
Don Krieger, Ph.D.
Department of Neurological Surgery
(412)648-9654 Office
(412)521-4431 Cell/Text
From: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu]
On Behalf Of Douglas Greve
Sent: Wednesday, August 13, 2014 10:01 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] quick pointer: tool to extract gray/white contrast vectors from [lr]h.w-g.pct.mgh
What do you mean by contrast vectors?
On 8/13/14 9:36 AM, Krieger, Donald N. wrote:
What is the tool to extract the contrast vectors from surf/[ lr]h.w-g.pct.mgh ?
Thanks,
Don
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