not really, since they contain both gyral and sulcal regions. Better than the whole surface I guess, but spatial standard deviations don't mean a whole lot - it's the cross subject ones you care about
Bruce On Thu, 24 Aug 2006, Sasha Wolosin wrote:
I understand that thickness may vary greatly across the entire surface, but shouldn't we expect some stability within smaller regions (e.g. those in the Desikan/Killany atlas)?
Bruce Fischl fischl@nmr.mgh.harvard.edu 8/24/2006 4:40 pm >>>
Hi Sasha,
the standard deviation across the surface isn't a very meaningful number, since the thickness isn't spatially stationary.
cheers, Bruce
On Thu, 24 Aug 2006, Sasha Wolosin wrote:
Dear all, I am interested in measuring mean thickness within ROI in MPRAGEs
of
children. My mean thickness values tend to be around 3.3 mm, with a standard deviation of about 1mm. I am concerned that these standard deviations are somewhat high. What typical values should I be
expecting
for standard deviation? Thanks, Sasha
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