Multi-detector row CT of the small bowel: Peak enhancement temporal window - Initial experience

Academic Article

Abstract

  • Purpose: To prospectively determine quantitatively and qualitatively the timing of maximal enhancement of the normal small-bowel wall by using contrast material-enhanced multidetector row computed tomography (CT). Materials and Methods: This HIPAA-compliant study was approved by the institutional review board. After information on radiation risk was given, written informed consent was obtained from 25 participants with no history of small-bowel disease (mean age, 58 years; 19 men) who had undergone single-level dynamic CT. Thirty seconds after the intravenous administration of contrast material, a serial dynamic acquisition, consisting of 10 images obtained 5 seconds apart, was performed. Enhancement measurements were obtained over time from the small-bowel wall and the aorta. Three independent readers qualitatively assessed small-bowel conspicuity. Quantitative and qualitative data were analyzed during the arterial phase, the enteric phase (which represented peak small-bowel mural enhancement), and the venous phase. Statistical analysis included paired Student t test and Wilcoxon signed rank test with Bonferroni correction. A P value less than .05 was used to indicate a significant difference. Results: The mean time to peak enhancement of the small-bowel wall wtis 49.3 seconds ± 7.7 (standard deviation) and 13.5 seconds ± 7.6 after peak aortic enhancement. Enhancement values were highest during the enteric phase (P < .05). Regarding small-bowel conspicuity, images obtained during the enteric phase were most preferred qualitatively; there was a significant difference between the enteric and arterial phases (P < .001) but not between the enteric and venous phases (P = .18). Conclusion: At multi-detector row CT, peak mural enhancement of the normal small bowel occurs on average about 50 seconds after intravenous administration of contrast material or 14 seconds after peak aortic enhancement. © RSNA, 2007.
  • Authors

    Published In

  • Radiology  Journal
  • Digital Object Identifier (doi)

    Pubmed Id

  • 6674147
  • Author List

  • Schindera ST; Nelson RC; DeLong DM; Jaffe TA; Merkle EM; Paulson EK; Thomas J
  • Start Page

  • 438
  • End Page

  • 444
  • Volume

  • 243
  • Issue

  • 2