It looks like you are doing the right thing. You indicated not to use a
contrast matrix. If you want to test a contrast, I think the matrix
would be [0 1] (I think it adds an offset regressor)
On 2/10/2023 4:50 PM, Finn, Quentin wrote:
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Freesurfer experts,
I have some surface data that I'd like to correlate with some other
data, although a linear regression would also be fine if I could get
something like a t-stat out of it.
This data came from two different PET tracers -- voxelwise data was
resampled via vol2surf onto each subjects cortical surface:
So I have, say, data like this:
tracer1_subj1_lh.mgh
tracer1_subj2_lh.mgh
.
.
.
.
tracer1_subjn_lh.mgh
And then I have another set:
tracer2_subj1_lh.mgh
tracer2_subj2_lh.mgh
.
.
.
.
tracer2_subjn_lh.mgh
I'd really like to just stack them all up with mris_preproc, something
like this:
mris_preproc --is tracer1_subj1_lh.mgh --istracer1_subj2_lh.mgh [etc]
--istracer1_subjn_lh.mgh--out tracer1_lh.mgh --hemi lh --fsgd tracer1.fsgd
mris_preproc --is tracer2_subj1_lh.mgh --istracer2_subj2_lh.mgh [etc]
--istracer2_subjn_lh.mgh--out tracer2_lh.mgh --hemi lh --fsgd tracer1.fsgd
The FSGD's are the same because the subjects are the same.
and then run something like...
mri_glmfit --glmdir tracer1_tracer2_left --y tracer1_lh.mgh --fsgd
tracer1.fsgd --pvr tracer2.mgh --no-contrasts-ok --surface fsaverage lh
This doesn't have an output that's really what I'm looking for as far
as I can tell though, there's no fit statistics type overlay in the
output folder, probably because I'm doing something wrong.
Any help on this would be just wonderful!
-quentin finn
Houston Methodist. Leading Medicine.
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