Dear Doug,

The problem is that I'm not sure what those terms exactly mean ! i.e. what is exactly CSF ? ventricles contain CSF right ? Is CSF counts for subdural CSF too ? I have a the aseg.stats with all terms inside but not sure which one to pick up, that's why I'm asked here.

Thank you,

Mahmoud

On Mon, Oct 27, 2014 at 9:35 AM, Douglas Greve <greve@nmr.mgh.harvard.edu> wrote:

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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