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Fig. 3A. —Aortic image noise of CT. Scatterplots show aortic image
noise of CT obtained by fixed tube current–second milliampere-seconds
(mAs) (A), by mAs modulation based on body weight (B), and by
mAs modulation based on scout image data (C). SDs of aortic image noise
were 2.03 (A), 1.61 (B), and 1.06 (C), respectively. SD
of image noise was minimized with statistically significant differences when
mAs was modulated on basis of scout image data (C) (p <
0.022, F test). Coefficients of determination (R2) were
0.644 (A), 0.047 (B), and 0.03 (C).
