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Fig. 13B. —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 A at 80 kVp, 120 mAs (150 mA and 0.8 sec),
4 x 5 mm detector configuration, 1.5 pitch. Beam-hardening artifacts
(arrowheads) were considered sufficiently severe to remove this
option from our pediatric protocol chart. This study was acquired with
approximately 9 mGy, which is 70% reduction in dose relative to image shown in
A.
