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Fig. 4. —Cross section (top) and CT attenuation profile (bottom) of 6-mm inner diameter model filled with contrast medium of low density (210 H). Circle on cross section corresponds to contour recognized by automated software. Straight lines inside circle correspond to minimal and maximal diameters in cross section. Increments of attenuation profile curve are 2 mm. A = soft, B = standard, C = detail, D = bone, and E = lung convolution kernels.