Thank you so much! ________________________________ From: Douglas N. Greve dgreve@mgh.harvard.edu Sent: Tuesday, June 3, 2025 10:55 AM To: freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] Re: register from fsaverage_sym back to native rh

Almost! When mapping to the right, you still use the left hemi fsaverage_sym/surf/lh.sphere.reg I took your solution (with this fix) and added it to the xhemi page https://surfer.nmr.mgh.harvard.edu/fswiki/Xhemi

On 6/3/2025 12:27 AM, Zahnert, Felix wrote: Hi, I think I have solved it myself, here's how:

Right:

mris_apply_reg --src data_on_fsavgsym_hemi-R.gii \ --trg data_native_rh.mgh \ --streg \ /usr/local/freesurfer/8.0.0/subjects/fsaverage_sym/surf/rh.sphere.reg \ ${freesurfer_dir}/xhemi/surf/lh.fsaverage_sym.sphere.reg

Left:

mris_apply_reg --src data_on_fsavgsym_hemi-L.gii \ --trg data_native_lh.mgh \ --streg \ /usr/local/freesurfer/8.0.0/subjects/fsaverage_sym/surf/lh.sphere.reg \ ${freesurfer_dir}/surf/lh.fsaverage_sym.sphere.reg

Thanks, Best, Felix

________________________________ From: Zahnert, Felix fzahnert@mgh.harvard.edumailto:fzahnert@mgh.harvard.edu Sent: Monday, June 2, 2025 12:31 PM To: freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] register from fsaverage_sym back to native rh

Dear Freesurfer experts, I would like to register surface data (an 'overlay' file) from fsaverage_sym space back to the subject's native rh.white surface. This seemed to work fine for the lh data using: mri_surf2surf --srcsubject fsaverage_sym --trgsubject fs8 --hemi lh --sval mysurfacedata_lh.gii --tval mysurfacedata_lh_native.mgh However, I am struggling to do this for the right hemisphere. Do you have any recommendations? Thank you in advance, Best, Felix

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