The area is just the sum of the area of the triangles in an ROI. For volume, we use Anderson Winkler's method of dividing each obliquely truncated trilateral pyramid into three tetrahedra. I don't know of a reference, but I've cc'ed Anderson.

On 3/17/2020 11:06 AM, Ting Li wrote:

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Dear Freesurfer Experts,

Where I can find any document that explaining how the cortical area and volume were calculated? or Could you give me an introduction about it.

Thank you so much!

Best regards, Ting

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