Hi FreeSurfer Experts,
I am trying to use mri_label_volume to correct for head size differences
in volumetric outputs. I know that this command needs a scale factor.
Where do I find this scale factor? Is this scale factor different for
each participant? I read through the eTIV wiki information
Hi Mike,
I think that's still correct, but it's been a long time since I messed
with it.
Bruce
On Tue, 13 Apr 2010, Michael Waskom wrote:
> Hi Bruce,
>
> I found some comments from your deep in the archive on converting
> distance measured on the sphere to distance on the folded surface:
> http
Hi Bruce,
I found some comments from your deep in the archive on converting
distance measured on the sphere to distance on the folded surface:
http://www.mail-archive.com/freesur...@surfer.nmr.mgh.harvard.edu/msg00251.html
Is this still the case? And, will loading the ?h.area file in matlab
and
Dear Doug and Nick,
In my matlab code when I sum the area stored in ?h.white.avg.area.mgh
I obtain an area of 82219 mm.
Are these area values affected by the problem explained in
http://surfer.nmr.mgh.harvard.edu/fswiki/GroupAverageSurface?
Have I to multiply the values for 1.2?
Nick, thank you fo
Rafa,
Not sure if this will help, but Bruce recently created a utility to
generate a parcellation based on which icosahedral face each vertex maps
to. Its called mris_make_face_parcellation, and you can get it here:
ftp://surfer.nmr.mgh.harvard.edu/pub/dist/freesurfer/misc/
ex.:
cd /surf
mr
The value at each vertex of ?h.white.avg.area.mgh is the average area at that
vertex averaged over all the input subjects. Note that the area of a vertex in
the average subject will likely be much less and is not particularly
meaningful. I'm not sure if this answers your question or not..
doug
Dear FS team,
I'm writing matlab code to obtain smaller parcellated regions of equal
size starting from the freesurfer parcellation performed on the
average subject. Should I apply a scale factor If I wanted to use the
areas stored in ?h.white.avg.area.mgh for the new parcellation? My
Freesurfer r
Cindy, the brains are not stretched in any way. All computations are
done in native anatomical space. The talairach reg is only there for
reporting purposes (or to create average subjects).
doug
Cindy Eckart wrote:
Dear freesurfers,
I am new in the list and will start with a hopefully not to
Hi Cindy,
the values in the various stats files are always in the subject's native
space. You may want to include eTIV as a regressor in your modeling, but we
don't do normalization by default.
cheers,
Bruce
On Tue, 10 Feb 2009, Cindy Eckart wrote:
Dear freesurfers,
I am new in the list
Dear freesurfers,
I am new in the list and will start with a hopefully not too stupid question...
besides a planned cortical thickness analysis I would like to compare the
volumes for some cortical parcellation areas between three groups. As far as I
understood the freesurfer-procedures the bra
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