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Fig. 1D —Influence of tagged material on visibility. Simulated CT scans at tube charges lower than in A: 20 mAs (B), 10 mAs (C), and 5 mAs (D). White arrow indicates 6-mm polyp submerged in fecal material in descending colon proven at colonoscopy. Polyp is highly visible in A but hardly visible in D. In comparison, haustral fold in transverse colon surrounded by air (gray arrow) remains highly visible in D.