This is a computer generated image from a medical Computed Tomography X-ray (CT) data set of the abdomen. Generating such an image involves in-house software implementing technology spanning ten years of research. The 3D bone surface is extracted from the original volumetric data and formed out of several hundred thousand triangles with similar sizes and aspect ratios. This surface is used to guide an algorithm which looks at the original data and attempts to estimate the thickness of the denser outer layer (cortex) of the bone. This is a difficult operation since this layer is often much thinner than the resolution of the CT data. Cortical thickness may well be an important parameter in analysing fracture risk, which is currently assessed by the average density of the entire bone. The original CT data was freely available, with no restrictions, from pubimage.hcuge.ch:8080/. The cortical thickness mapping technique is being developed in conjunction with Andrew Gee (Dept. Engineering), and Ken Poole and Paul Mayhew (Dept. Medicine).
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