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Fig. 2A. —Images show cross sections (top) and graphs show CT attenuation profiles (bottom) of models. Circles on cross sections correspond 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 1 mm. Models that have 0.8-mm-thick wall and are filled with contrast medium of intermediate density (270 H) are shown in 20-cm (A), 15-cm (B), and 10-cm (C) display fields of view.