title: Diagnostic performance of CT colonography for the detection of colorectal polyps.
abstract: OBJECTIVE
  To investigate the diagnostic value of CT colonography for the detection of colorectal polyps.
  
  
  METHODS
  From December 2004 to December 2005, 399 patients underwent CT colonography and follow-up conventional colonoscopy. We excluded cases of advanced colorectal cancer. We retrospectively analyzed the CT colonography findings and follow-up conventional colonoscopy findings of 113 patients who had polyps more than 6 mm in diameter. Radiologists using 3D and 2D computer generated displays interpreted the CT colonography images. The colonoscopists were aware of the CT colonography findings before the procedure.
  
  
  RESULTS
  CT colonography detected 132 polyps in 107 of the 113 patients and conventional colonoscopy detected 114 colorectal polyps more than 6 mm in diameter in 87 of the 113 patients. The sensitivity of CT colonography analyzed per polyp was 91% (41/45) for polyps more than 10 mm in diameter and 89% (101/114) for polyps more than 6 mm in diameter. Thirteen polyps were missed by CT colonography and were detected on follow-up conventional colonoscopy.
  
  
  CONCLUSIONS
  CT colonography is a sensitive diagnostic tool for the detection of colorectal polyps and adequate bowel preparation, optimal bowel distention and clinical experience are needed to reduce the rate of missing appropriate lesions.
authors: Department of Radiology, Song-Do Hospital, Seoul, Korea. bugbearsyun@naver.com
authors: Ji-young
authors: JY
authors: Yun
authors: Hee Jeong
authors: HJ
authors: Ro
authors: Jong Beom
authors: JB
authors: Park
authors: Jung-Bin
authors: JB
authors: Choi
authors: Ji Eun
authors: JE
authors: Chung
authors: Yong Jin
authors: YJ
authors: Kim
authors: Won Hyuck
authors: WH
authors: Suh
authors: Jong Kyun
authors: JK
authors: Lee
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003111:Colonic Polyps / Q000175:diagnosis*; D023881:Colonography, Computed Tomographic / Q000379:methods*; D003113:Colonoscopy / Q000379:methods; D015179:Colorectal Neoplasms / Q000175:diagnosis*; D003287:Contrast Media / Q000008:administration & dosage; D005188:False Negative Reactions; D005189:False Positive Reactions; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D007472:Iohexol / Q000031:analogs & derivatives; D008875:Middle Aged; D015588:Observer Variation; D011237:Predictive Value of Tests; D011856:Radiographic Image Enhancement / Q000379:methods; D012189:Retrospective Studies; D012680:Sensitivity and Specificity
chemical_list: D003287:Contrast Media; D007472:Iohexol; C038192:iopromide