Re: [Freesurfer] Gaussian Curvature Calculation

Hi Lisa,

we actually provide a discrete estimate using Gauss-Bonnet (Rudolph can give you the details), and a slightly larger-scale estimate by fitting a quadratic patch to each neighborhood (5mm on a side I think). The curvature then comes from the Hessian of the height function of that patch.

cheers, Bruce

On Fri, 26 Feb 2010, Lisa Ronan wrote:

Hi All

I wonder could you tell me how Gaussian curvature values are computed at a vertex, i.e. Gauss_Bonnet scheme? Is there any way to vary the neighborhood over which the vertex curvature values are computed?

Thanks for your help,

Lisa Ronan

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Research Associate Brain Mapping Unit Sir William Hardy Building Department of Psychiatry University of Cambridge