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Fig. 2E. —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. Computer-simulated image at level of upper poles of kidneys was obtained at 40 mA. Note that intrahepatic course of falciform ligament in intralobar fissure (large straight arrow) and lower aspects of both adrenal glands (small straight arrows), both high-visibility structures, are evident even on 40-mA simulated image. Hepatic artery (curved arrow), considered low-visibility structure, was evident on this single image at 40 mA but was not seen at as many levels with lower tube current simulations.

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