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Fig. 2G. —Comparison of computer-simulated images and multidetector CT (MDCT) scan obtained with true tube current. For evaluation of renal cysts seen on sonography, 2-year-old girl underwent IV contrast-enhanced MDCT of upper abdomen. Increased noise in simulated images at level of mid kidneys obscures several intraparenchymal vessels that are well depicted on original 120-mA MDCT scan. In original scan (F), adjacent common bile duct is also easier to identify next to ampulla of Vater. Note that two renal cysts (small arrows, H) in right kidney are identified even in 40-mA simulation (H).

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