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Hi Tim,

I think this is possible with mris_left_right_register, e.g.

mris_left_right_register -dist 1 lh.sphere rh.sphere lh.sphere.d1.left_right rh.sphere.d1.left_right

-Paul

On Fri, Jun 11, 2021 at 10:02 AM Tim Schäfer ts+ml@rcmd.org wrote:

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Dear FreeSurfer experts,

for the 'fsaverage_sym' template that comes with FreeSurfer, I would like to find a mapping between equivalent vertices (i.e., vertices in the same anatomical position) between the left and right hemispheres.

By "equivalent" I mean identical anatomical positions. I noticed, for example, that vertex 500 in the file fsaverage_sym/surf/lh.white and vertex 500 in the file fsaverage_sym/surf/rh.white are not at equivalent anatomical points.

I feel this mapping must be documented somewhere or there is an obvious way to get it that I am currently overlooking, so I thought I'd ask here.

Thanks in advance,

Tim

-- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany

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Why do you want to find the correspondence? The tool was not made to be used this way, though I understand it is a little confusing. You are supposed to register both left and right of your subject to the left fsaverage_sym and do your processing there. The only reason to go to the right of fsaverage_sym is for testing that you are getting roughly the same answer (ie, the software is working and unbiased).

On 6/11/2021 10:01 AM, Tim Schäfer wrote:

     External Email - Use Caution

Dear FreeSurfer experts,

for the 'fsaverage_sym' template that comes with FreeSurfer, I would like to find a mapping between equivalent vertices (i.e., vertices in the same anatomical position) between the left and right hemispheres.

By "equivalent" I mean identical anatomical positions. I noticed, for example, that vertex 500 in the file fsaverage_sym/surf/lh.white and vertex 500 in the file fsaverage_sym/surf/rh.white are not at equivalent anatomical points.

I feel this mapping must be documented somewhere or there is an obvious way to get it that I am currently overlooking, so I thought I'd ask here.

Thanks in advance,

Tim

-- Dr. Tim Schäfer Postdoc Computational Neuroimaging Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy University Hospital Frankfurt, Goethe University Frankfurt am Main, Germany

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