Hi,
I found the reference to D. Van Essen's paper:
Van Essen, D and Drury, H (1997) "Structural and functional analyses
of human cerebral cortex using a surface-based atlas" J Neurosci 17
(18):7079-7102
and the folding index is defined (from that paper) as "the integral
of the product of the maximum principal curvature and the difference
between maximum and minimum curvature, divided by 4*pi", ie,
FI= (1/4pi) \int \int |kmax|(|kmax|-|kmin|) dA
is this what freesurfer is using?
thanks,
roberto
On 8 Feb 2006, at 16:39, Bruce Fischl wrote:
the Gaussian and mean curvature are differential geometric measures
and you can find them in any standard textbook (e.g. do Carmo). The
folding indices come from one of David Van Essen's papers - sorry,
I don't have the reference offhand, but it shouldn't be too hard to
find.
Bruce
On Wed, 8 Feb 2006, Goradia, Dhruman D wrote:
Hi,
The output of function "mris_anatomical_stats" contains the following
measurements: integrated rectified mean curvature, integrated
rectified
Gaussian curvature, folding index and intrinsic curvature index. Can
someone please give me a brief explanation of what these measurements
are or suggest some reading material.
-Dhruman
Dhruman D. Goradia (M.S.)
Research Specialist.
Western Psychiatric Institute and Clinic.
3811 O'Hara St. Suite 431
Pittsburgh, PA 15213
Phone: 412-586-9017
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