title: Diagnosis of acute gastrointestinal bleeding: comparison of the arterial, the portal, and the combined set using 64-section computed tomography.
abstract: OBJECTIVE
  To compare the respective capabilities of the arterial, the portal, and the combined set in the detection and localization of acute gastrointestinal (GI) bleeding with 64-section computed tomography (CT).
  
  
  METHODS
  A total of 46 patients with acute GI bleeding and who had undergone both 64-section CT and digital subtraction angiography were included in this study. The results of angiography were used as a reference standard. Two radiologists independently reviewed the 3 sets of CT images (arterial set, the unenhanced and arterial-phase images; portal set, the unenhanced and portal venous-phase images; combined set, the unenhanced and arterial-phase and portal venous-phase images). The diagnostic accuracy was assessed by a receiver operating characteristic analysis.
  
  
  RESULTS
  For each observer, the Az values were 0.915 and 0.931 for the arterial set, 0.903 and 0.933 for the portal set, and 0.919 and 0.911 for the combined set, respectively. The differences were not statistically significant among the 3 data sets for each observer (P > 0.05). Both observers correctly detected the bleeding site in 81.3% and 84.4% on the arterial set, in 81.3% and 84.4% on the portal set, and in 84.4% and 84.4% on the combined set, respectively.
  
  
  CONCLUSIONS
  Using 64-section CT, the diagnostic performance was not different among the arterial, the portal, and the combined set for the detection and localization of acute GI bleeding.
authors.affiliation: Department of Radiology, Chonnam National, University Medical School, 8 Hack-dong, Dong-gu, Gwangju, 501-757, South Korea.
authors.forename: Jin Woong
authors.initials: JW
authors.lastname: Kim
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Shin
authors.forename: Woong
authors.initials: W
authors.lastname: Yoon
authors.forename: Nam Kyu
authors.initials: NK
authors.lastname: Chang
authors.forename: Suk Hee
authors.initials: SH
authors.lastname: Heo
authors.forename: Yong Yeon
authors.initials: YY
authors.lastname: Jeong
authors.forename: Heoung Keun
authors.initials: HK
authors.lastname: Kang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015901:Angiography, Digital Subtraction / Q000379:methods*; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult