RV: Re: [Freesurfer] Spherical ROIs areas in the fsaverage

Ok, but my automatic procedure constructed the ROI masks on the lh.sphere (not on lh.sphere.reg)of the fsaverage subject.

Is it wrong to compute the area of a ROI in the fsaverage spherical surface by adding the areas of the triangular faces inside this region? (The area of each triangular face being computed using the spherical coordinates of its vertices and the Heron formula for the triangle area)

Thank you for your useful help Jorge

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