It will not be one surface area for all voxels, each voxel will have it's own surface area. If you have a particular voxel in mind, then you can create a volume where that voxel is 1.0 and the rest 0, then map it to the surface and to fsaverage and see how big it gets.

On 6/13/17 9:26 PM, Matthieu Vanhoutte wrote:

Dear Freesurfer's experts,

Given the well known size of a voxel I would like to know the equivalent surface area once projected on the white fsaverage cortical surface.

Could anyone give me a proper way of computing this ?

Best regards, Matthieu

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