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Fig. 13C. —4-year-old boy with stage V renal Wilms' tumor. All images were obtained with 23-cm display field of view. Note that although window width and window level settings on these three images are relatively consistent, the IV contrast timing is different among three image sets and results in various tissue contrast levels. Clinical abdominopelvic CT image was obtained 2 months after B using 100 kVp, 128 mAs (160 mA and 0.8 sec), 23-cm field of view, 4 x 5 mm detector configuration, and pitch of 1.5. Although beam-hardening artifacts are still present (arrow and arrowheads), their appearance is much less severe than that in 80-kVp image (B). This study was acquired with approximately 18 mGy, which is 40% reduction in dose relative to image shown in A.