[Freesurfer] FreeSurfer 6 vertex-wise cortical volume computation details?

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Dear FreeSurfer experts,

can anybody refer me to a publication that explains in detail how vertex-wise cortical volume (the data in <subject>/surf/?h.volume) is computed in FreeSurfer 6?

My understanding is the following: * area is computed as 1/3 the area of all triangles meeting at that vertex. * thickness is the shortest distance from the vertex (at white surface) to any vertex on pial, then the other way around from that pial vertex, divided by two. * volume is area * thickness

Is that true, and where can I read up on it?

Thanks,

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