CT Colonography Predictably Overestimates Colonic Length and Distance to Polyps Compared With Optical Colonoscopy
2009
OBJECTIVE. The purpose of this study was to determine the discrepancy between CT colonography (CTC) and optical colonoscopy (OC) measurements for both anus-to-cecum length and anus-to-polyps distance and then determine whether a conversion factor could be generated to equate these CTC and OC distances.MATERIALS AND METHODS. We retrospectively reviewed CTC and OC reports from patients who had undergone both procedures as part of an established protocol. The anus-to-cecum measurement recorded on a single proprietary CTC workstation was compared with the OC cecal length for each patient. Likewise, anus-to-polyp distances were compared as measured by the radiologist and endoscopist.RESULTS. Three hundred thirty-eight patients and 437 polyps were identified with complete data from both CTC and same-day OC. The average anus-to-cecum distance measured at CTC was 189 cm (range, 75–257 cm) and at OC, 108 cm (range, 65–150 cm). For polyps proximal to the splenic flexure (n = 145), the CTC anus-to-polyp measurement ...
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