Hi Eli,
the eTIV is estimated from the talairach_with_skull.lta linear transform, so you might visually verify that it is correct on our subjects.
chers, Bruce
On Tue, 21 Mar 2006, Eli Diamond wrote:
Hello,
I'm writing because I am trying out some structure-function analyses and I would like to normalize my label volume measurements with the total intracranial volume. I was informed that this value is in <subject>/stats/aseg.stats.
I was surprised at the range of TIVs that I saw in my 29 subjects (from 1400cm^3 to 2500cm^3). so I looked up what the normative values are for TIV, and it appears that the TIVs estimated for my group are irregular given the standard mean TIV and normal variance. (from one paper that I looked at it seems like the avereage TIV is around 1500cm^3 and that typical variation is measured in the 10-100cm^3 range, not an order of magnitude more than that.)
Does anyone have any experience with the estimated TIV and what to expect as a normal range / how to know when something is wrong?
Thanks so much!
Best, Eli Diamond _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer