They are computed from the ?h.white surface. The ?h.curv is the
spatially smoothed mean curvature, and the ?h.curv is the integrated dot
product of the movement vector with the surface normal during inflation.
Therefore the curv is a local differential measure that will highlight
small scale structure, while the sulc is insensitive to small local
geometry and highlights larger scale structure (e.g. was the point deep
even though it was folded out)
On
Tue, 7 Feb 2012, Jing Ming wrote:
Hi surfers:
I have a two questions.
1) how does freesurfer calculate ?h.sulc file and ?h.curv. Are they
calculated after gray/white/csf segmentation? Are they calculate based on
gray/white boundary?
So, difference between ?h.sulc or ?h.curv will directly come from white matter
change, right?
2) what's the difference between ?h.sulc and ?h.curv? In terms of sulcal
structure, does ?h.sulc indicate sulcal depth and ?h.curv somehow indicate
sulcal width?
To me, from the display, ?h.sulc seems a smoothed version of ?h.curv. From some
reference, I know .sulc is also called average convexity, so is the convexity
for
each vertex averaged within a small region or is it averaged through the whole
hemisphere brain surface?
Thanks much for your help!
Best
Jing
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