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Fig. 1C. —Comparison of computer-simulated images and multidetedtor CT (MDCT) scans obtained with true tube currents in 25cm water phantom. Except for tube current, all parameters are identical. MDCT scans obtained with serial reductions in tube current show relatively increased noise. Corresponding images with simulated tube current reductions are identical in appearance to those obtained with actual reduced tube current. Two other simulations (not shown) were performed at 100 and 60 mA. MDCT scan was obtained at true 40 mA.

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