[Freesurfer] Computing measures like area for a custom surface

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Dear list,

I have created a custom surface at 50% thickness between the white and pial for my subjects (`mris_expand -thickness lh.white 0.5 lh.graymid`).

Is there a way to compute measures like curv and area for this surface using FreeSurfer tools?

An example to clarify: I would like to get a file named lh.area.midgray for my new midgray surface, just like I have lh.area and lh.area.pial for the white and pial surfaces, respectively.

I have checked the recon-all devtable [1] and it looks like `mris_make_surfaces` is used to compute these measures. But it is not clear to me whether I could use it for a custom surface as well (and if so, how).

Best,

Tim

[1] https://surfer.nmr.mgh.harvard.edu/fswiki/ReconAllTableStableV6.0

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