You can look in this extended LUT.

https://gate.nmr.mgh.harvard.edu/safelinks/greve/gtmseg.ctab

The last number in the column is the tissue type as indicated in the header. Note that there may be some that are ambiguous, like brainstem which is classified as WM.

Sorry i meant brain parcellation ( aseg.mgz )

On Tue, Oct 3, 2017 at 5:33 PM Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:

Hi Fereshte

all cortical parcels are gray matter. Maybe I'm not understanding your
question?
Bruce


On Tue, 3 Oct 2017, Fereshte wrote:

> Dear Experts,How to figure out if a cortical parcellation is Considered as a part of gray matter or
> white matter ? 
> Thank you! 
>
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