Hi Kai,

it was described in the Dale, et al. 1999 paper in NeuroImage, or maybe part in that and part in the 2nd part of it (Fischl et al., 1999 also NeuroImage). They are both on our wiki (surfer.nmr.mgh.harvard.edu/fswiki). We don't use marching cubes, but a custom tesselation algorithm. The surface smoothing is like a Laplacian, but the surface area of the inflated surface is constrained to be the same as the original surface.

cheers, Bruce

On Mon, 25 Jun 2007, Kai Li wrote:

Dear list, Is there a paper or any documentation describing how freesurfer tessellate and smooth cortical surfaces? In particular, does freesurfer use any specific variety of marching cube isosurface algorithm? Regular surface smoothing (like the Laplacian smoothing) may cause undesired surface shrinking. It looks that freesurfer does a good job on surface smothing. So I'm wondering what smoothing algorithm freesurfer employ.

Thanks, Kai _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer