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|== Gray Matter and White Matter Volume ==|
Gray Matter and White Matter Volume
Estimation of the gray matter and white matter volumes should be taken from the surfaces, and not from the aseg. The program mris_volume will compute the volume inside a surface. It should be run from within the <subjid>/surf directory with the following command:
where ?h.surface is replaced with the specific surface you are looking for the volume of.
To get the gray matter and white matter volumes you should use the following formulas:
gm volume = pial volume - white volume wm volume = white volume - (ventricles+caudate+putamen+pallidum+thalamus)*
* the subcortical volumes can be taken from the aseg.stats file.