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Fig. 2B —Graphs show image noise for anatomic levels I-IV with
different tube current modulation techniques. Level I is at portal vein; level
II, at renal hilum; level III, cephalad to iliac crest; and level IV, in
pelvis cephalad to acetabulum. Boxes include mean ± SD, and whiskers
indicate 95% CIs. Random x's indicate outliers. Tube current of 120 reference
mAs with z-axis tube current modulation.
