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Fig. 7B. —Fecal tagging with orally administered barium supplement in two patients. Computer-generated electronic accented image shows high-attenuation barium-impregnated stool as blue pixels before electronic subtraction (thin arrow). Soft-tissue-attenuation adjacent polyp (thick arrow) is visible more ventrally. (Courtesy of Johnson CD, Fletcher J, Callstrom R; Rochester, MN)