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[Intestinal contrasting in abdominal computed tomography].

K Schunk1, J Wiessner, S Schadmand

  • 1Institut für Klinische Strahlenkunde, Johannes Gutenberg-Universität Mainz.

Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|May 1, 1992
PubMed
Summary

This study explored using mannitol solution as a negative contrast agent for abdominal CT scans, finding it comparable to positive contrast agents for gastrointestinal tract visualization.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Gastroenterology

Background:

  • Conventional abdominal CT scans utilize positive contrast agents for gastrointestinal tract visualization.
  • Iodine-containing contrast media are typically employed, which can sometimes lead to artifacts.

Purpose of the Study:

  • To evaluate the efficacy of a negative contrast agent, specifically a 2 1/2% mannitol solution, for defining the gastrointestinal tract in abdominal CT.
  • To compare the diagnostic quality and potential drawbacks of negative contrast imaging versus positive contrast imaging.

Main Methods:

  • Fifty-six patients undergoing abdominal CT were included in the study.
  • The gastrointestinal tract was filled with a 2 1/2% mannitol solution as a negative contrast agent.
  • Image quality and diagnostic capabilities were assessed and compared to conventional positive contrast methods.

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Main Results:

  • The mannitol solution provided similar gastrointestinal tract filling quality compared to positive contrast media.
  • Differentiation between the gastrointestinal tract and other abdominal organs was comparable between both methods.
  • The negative contrast method showed a slight increase in artifacts at high contrast boundaries but was superior for evaluating the gastrointestinal tract wall.
  • Diagnostic performance for cystic tumors was poorer with the negative contrast method.

Conclusions:

  • Negative contrast imaging with mannitol solution is a viable alternative to positive contrast agents for abdominal CT.
  • While it has limitations in diagnosing cystic tumors, it offers advantages in assessing gastrointestinal wall integrity.
  • Further research may optimize negative contrast techniques for broader gastrointestinal imaging applications.