You probably want something like BrainSegNotVent/Sum(CSF and Ventricles)
Is that what you mean?
doug


On 10/26/14 11:45 PM, Mahmoud wrote:
Dear all,

I used the the 3 steps of longitudinal analysis explained in freesurfer longitudinal tutorial and need to compute the ratio Parenchyma/CSF for each of time points. Is this equivalent to compute the  (total gray matter volume + total cortical matter volume)/CSF from aseg.stats file ?

Thank you,
Mahmoud


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