one is usually fine, although it depends on the intrinsic SNR.

cheers,
Bruce
On Sat, 14 Jun 2008 [EMAIL PROTECTED] wrote:


Hi,

I'm starting to use Freesurfer to analyze SPGRs images and my question is: Do I 
have to use the average of two images (invol1 +
invol2) or I just can use one SPGRs?
Thanks
Valentina
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