On 10/24/2013 10:37 AM, Dorian P. wrote:
> Dear all,
>
> Excuse if these are simple questions but I am a bit confused on the
> significance of the volume measures.
>
> 1. Are the volumes of ROIs calculated after normalization?

No, everything is done in native space.

>
> 2. If volumes are calculated post-normalization, why is correction for
> eTIV needed?
>
> 3. What is the quickest way to correct for eTIV?

Not sure what you mean by the "quickest". Usually the ROI volumes are
divided by the eTIV or the eTIV is used as a regressor
doug
>
> Thank you.
> Dorian
> TJU
>
>
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MGH-NMR Center
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