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Fig. 5A —Supine scout films in 52-year-old man undergoing CT colonography (CTC) screening. Patient volunteered to space out supine and prone scanning to allow distention with both carbon dioxide (CO₂) and room air (RA), with additional scout films 15 min after each. Supine scout films using CO₂ for distention immediately before supine CTC (A) and 15 min later (B) show significant resorption of colonic gas.