ABSTRACT
CT colonography is a relatively new technique for imaging the entire colon using thin-section computed tomography (CT). First introduced in 1994 (1), it was immediately popularized as a form of ‘‘virtual colonoscopy’’ because of its capability to reconstruct the acquired images into threedimensional (3D) views of the colonic lumen, allowing dynamic navigation through the colon in a manner simulating a ‘‘real’’ colonoscopy. Initial reports of diagnostic accuracies of CT colonography exceeding those of barium enema and approaching those of conventional colonoscopy generated intense excitement among radiologists and gastroenterologists alike (2^7). Further experience with the technique has led to widespread debate about the nature of colon cancer and revised thinking on the aims of colon surveillance. As CT colonography continues to undergo worldwide assessment and rapid re¢nement, it is increasingly being accepted as a routine tool for colon examination. This review of the performance of CT colonography to date will focus on the practical applications of the technique, pitfalls in image interpretation, and will attempt to discuss both consensus and controversial viewpoints on the role of CT colonography in colorectal cancer detection.
