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Fig. 3 —Plot across normal and plaque-containing arterial segments shows attenuation values in Hounsfield units. Values were obtained by measuring 2,296 voxels in 41 normal segments (56 voxels per segment) and 448 voxels in eight abnormal segments (56 voxels per segment). Each voxel represents an average of eight separate measurements. Plaque-containing segment always showed significantly lower attenuation values than its respective normal segment (p < 0.05). Attenuation values of voxel C and at epicardial fat-wall interface were not significantly different between normal and plaque-containing segments.