Hi Wan,
they haven't been normalized. Typically you would normalize by the total intracranial volume, which can be a bit tricky to get from only a T1. If you normalize by total brain volume, that should be a bit more conservative, as it would normalize out total atrophy.
cheers, Bruce
On Tue, 31 May 2005, Wan Park wrote:
Hi, I have a question. I am getting the gray volume for a standard area (G_subcallosal) in different brains (male and female) with different conditions.
If I want to compare these volumes, should I normalize them with the total brain (or hemisphere) volume or can I use these results directly? I understand that the FS fills the volume from a particular brain into a standard brain. So, are the volumes already normalized? Thanks,
Wan