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Fig. 1A —Voxel analysis definitions. Diagram of arterial segment shows
eight radial lines at 45° intervals across artery for generation of voxel
attenuation plot. Voxels A and B are placed in epicardial fat, C at epicardial
fat-wall interface, D and E spanning wall, and F and G in lumen. Each 400-µ
voxel was sampled eight times in each cross section to obtain average density
value (in Hounsfield units) in 41 normal segments. These values were used to
determine attenuation value at interface of epicardial fat and outer wall and
inner wall-lumen interface and to establish wall thickness of 800 µ.