Many thanks for your reply.
Unfortunately the option -sval didn't work and it is still using the old sphere.reg file.
I was however wondering whether mri_surf2surf already sorts vertices and hence makes them comparable. For instance, is vertex 1 on the resampled surface the closest match to vertex 1 on the target surface? In that case, I would not even have to map data back to fsaverage6.
Best, Christine
On 20/12/2011 15:53, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:
Hi Christine
I think you do it the same way, just using -sval instead of -sval-xyz (since you are mapping a scalar field instead of the coordinates).
cheeers Bruce On Tue, 20 Dec 2011, Ecker, Christine wrote:
Dear FreeSurfer Experts,
I would like to down-sample the pial surface of individual subjects to have the same number of vertices as fsaverage6. I have done so using:
mri_surf2surf --hemi lh --srcsubject 'subjectID' --sval-xyz pial --trgsubject fsaverage6 --trgicoorder 6 --trgsurfval 'outputfilename'
This worked well and the pial output surface has 40962 vertices. I now have an overlay vector, which was computed on the down-sampled pial surface, which I would like to map back to fsaverage6 in order to perform a group comparison.
Please could you advise on how to do this as all scripts I am aware of (e.g. mris_preproc) use sphere.reg, which has ~150000 vertices.
Many thanks, Christine
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