Hi Dongyue
 
A couple of things. I’m not sure which column you mean in the aparc.stats, but the default values are usually for the white surface not the pial. But more importantly, what are you trying to achieve by computing the mean area? That will be a function of the tessellation I think, not of the surface. Don’t you want the mean across subjects, not across vertices within a subject?
 
Cheers
Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Dongyue Zhou
Sent: Saturday, March 26, 2022 1:02 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] Question about calculation of pial area in DKatlas

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Dear FreeSurfer experts:
        I want to calculate mean pial surface area in DKatlas in individual space.And I know the function read_annotation.m in $FREESURFER_HOME/matlab for loading this atlas.
And if I can load sub/surf/?h.area.pial as the area in each vertice and calculate mean pial area by dividing sum PSA of all vertices in one ROI by the number of vertices in this ROI?
But why my result is not the same as result in sub/stats/?h.aparc.stats ?  Does the column named surface area represent mean PSA in each ROI?
 
Bests,
Dongyue