Comparison of Time-Efficient CT Colonography with Two-and Three-Dimensional Colonic Evaluation for Detecting Colorectal Polyps

OBJECTIVE. We compared the findings of time-efficient CT colonography with complete two-dimensional (2D) and three-dimensional (3D) CT colonography and conventional colonoscopy in detecting colorectal polyps.SUBJECTS AND METHODS. Forty-two patients undergoing colonoscopy screening were examined with CT colonography before endoscopy. Data were examined following one of two methods. In method 1, axial 2D data sets were examined in a cine mode. If findings were suggestive of abnormality, focal areas were examined with 3D CT colonography. In method 2, data sets were examined exactly as in method 1, and subsequent to that review, data sets were examined with simultaneous 3D “fly-through” CT colonography (surface-rendered images) and multiplanar reformatted images.The time required to examine CT colonography using each technique was recorded and abnormal findings were documented. Results of methods 1 and 2 were compared with findings on colonoscopy.RESULTS. Colonoscopy detected 16 polyps in 13 patients (polyp s...