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Fig. 1A —Transverse CT images in patients with three different body sizes (small, medium, and large) in whom different degrees of aortic and hepatic attenuations were seen. (Image display window width, 300 HU; center, 30 HU.) 6-year-old girl who weighed 20 kg (small body size) and received 40 mL of contrast medium (contrast medium iodine mass per body weight index, 0.70) had 195 HU of aortic and 134.5 HU of hepatic attenuation.