I'm new to freesurfer, so I'm hoping this question isn't too obvious. I've searched the mailing list archives and the wiki but haven't found any leads.
I'm wondering if there's a way to generate a volume representation of the cortical sheet, based on the data from the white surface and the pial surface, so that the sheet will be guaranteed to have good topology, as well as retaining the proper thickness at each point? It seems like all the information for this is there already since we have the two surfaces, but I don't know how to go about figuring out how to convert it into volume data.
Here's a small image that might help give an idea of what I need: http://brainimaging.waisman.wisc.edu/~perlman/corticalsheet.png
In case you're curious, the reason I want this is because we're trying to test the novel method for cortical thickness measurement given in "Three-Dimensional Mapping of Cortical Thickness Using Laplace's Equation", Jones, Buchbinder and Aharon, Human Brain Mapping 11:12-32(2000).
-- -dave---------------------------------------------------------------- After all, it is not *that* inexpressible. -H.H. The Dalai Lama