Hi Bruce

Thanks very much for your suggestion. Just one more question that I am confused with. Is the surface area calculated based on the white matter surface or pial surface ?

Thanks for your time.

Best

Zhiliang


At 2017-08-13 22:47:07, "Bruce Fischl" <fischl@nmr.mgh.harvard.edu> wrote:
>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
>> 
>> 
>> 
>>  
>> 
>> 
>>