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DOI: 10.1148/radiol.2483071645
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(Radiology 2008;248:1018-1027.)
© RSNA, 2008

Technical Developments

Volume Rendering with Color Coding of Tagged Stool during Endoluminal Fly-through CT Colonography: Effect on Reading Efficiency1

Seong Ho Park, MD, Seung Soo Lee, MD, Jin Kook Kim, PhD, Min-Ju Kim, MD, Hye Jin Kim, MD, So Yeon Kim, MD, Min-Yeong Kim, MD, Ah Young Kim, MD, and Hyun Kwon Ha, MD

1 From the Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 388-1 Poongnap-Dong, Songpa-Gu, Seoul 138-040, Korea (S.H.P., S.S.L., H.J.K., S.Y.K., M.Y.K., A.Y.K., H.K.H.); Infinitt, Seoul, Korea (J.K.K.); and National Cancer Center, Gyeonggi-Do, Korea (M.J.K.). Received September 18, 2007; revision requested December 11; revision received January 13, 2008; accepted February 28; final version accepted March 13. Supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2007-331-E00156). Address correspondence to S.H.P. (e-mail: seongho@amc.seoul.kr).

Institutional review board approval and informed consent were obtained. This study was conducted to evaluate a newly developed technique for discriminative color coding of tagged stool during three-dimensional (3D) endoluminal fly-through computed tomographic (CT) colonography and to determine its effect on reading efficiency. Thirty patients, including three dropouts, were prepared with moderate cathartic preparation (20 mg bisacodyl, three doses of 200 mL of 5% wt/vol barium sulfate). Images were reviewed by two independent readers with and without color coding. Reader preference, interpretation time, and diagnostic performance were evaluated. Both reviewers preferred color coding. With color coding, interpretation time was shortened by 3 minutes (reader 1, P = .002) and 2.5 minutes (reader 2, P = .009); sensitivity for 6-mm-diameter or larger lesions remained constant at 96% (24 of 25; 95% confidence interval: 78.9%, <100%; P = >.99). This technique facilitates primary 3D interpretation of images obtained with moderate cathartic preparation.

© RSNA, 2008