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PURPOSE: To compare respiratory artifacts, colonic distention, and polyp detection at computed tomographic (CT) colonography by using single– and multi–detector row helical CT systems.

MATERIALS AND METHODS: A total of 237 consecutive patients received subcutaneously administered glucagon and underwent prone and supine CT colonography with single–detector row CT (n = 77) and multi–detector row CT (n = 160), followed by colonoscopy. Examination results were graded for colonic distention, respiratory artifacts, and polyp depiction by two radiologists working independently.

RESULTS: Suboptimal colonic distention was significantly more common with single–detector row CT and was present in at least one segment in 52% (40 of 77 patients) of examinations versus only 19% (30 of 160 patients) with multi–detector row CT (P < .001). Mild respiratory artifacts were present in 61% (47 of 77 …