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Fig. 7. —Graph shows noise measurements from phantom chest and abdominopelvic images obtained at 200 mAs and varying peak kilovoltage. Image noise varied by as much as a factor of 3.3 among phantom images using identical scanning techniques. Black bar = 1-year-old phantom, bar with horizontal lines = 5-year-old phantom, bar with vertical lines = 10-year-old phantom, bar with cross-hatch lines = adult phantom. AbdPel = abdominopelvic image.