Hi John

they are guaranteed to have the same # of vertices, so the answer is kind of "yes", but the thickness is not the distance between them, but rather the distance from the closest point (which might or might not be the "same" vertex).

You can use mri_surf2vol to sample back into the volume if you want.

cheers Bruce

On Fri, 29 Jun 2012, John Papaioannou wrote:

Hi, In regard to the surface files, is it correct to say that the wm and pial vertices correspond to each other (e.g., wm vertex # 12345 corresponds to pial vertex # 12345 as the minimum distance between the two surfaces), and so have the same number of vertices?

Also, I would like to "colorize" voxels, but not for segmentation.  Instead, colored voxels would represent various metric "anomalies".  It's rather easy with curv files for 3D display (positive or negative values at vertex), but I want to show this on tkmedit in 2D.  Could you explain what is the easiest way to do this?

Thanks, John

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John Papaioannou Medical Imaging Sciences Digital Mammography, CAD Mammography Department of Radiology Biological Sciences Division The University of Chicago 5841 South Maryland Avenue Chicago, Illinois 60637 773.834.5104 voice        773.702.0371 fax