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Fig. 13A. —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 before adjustment of CT for pediatric imaging. Technique parameters were 120 kVp, 128 mAs (160 mA and 0.8 sec), 4 x 3.75 mm detector configuration, and 1.5 pitch. This examination is associated with dose of approximately 29 mGy and is considered relatively free of artifact.