Re: [Freesurfer] Question about global mean cortical thickness

Hi Zhiliang

the thickness is the average of the min distance from gray-to-white and white-to-gray at each vertex. The surface area is the average area of the triangles attached to a vertex (divided by 3 I think).

cheers Bruce

On Sun, 13 Aug 2017, Zhiliang Long wrote:

Dear FS experts:      I am writting to ask for help about the computation of global mean thickness. On the FAQ page, one suggestion is that the global mean thickness is equal to the (lh.thickness*lh.surfarea + rh.thickness.rh.surfarea) / (lh.surfarea+rh.surfarea). I am wondering how the ?h.thickness and ?h.surfarea are calculated.      Any suggestions are appreciated.     Thanks for your time.

Best Zhiliang Long