Which Iodine concentration in chest CT?--a prospective study in 300 patients

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Georg Mühlenbruch1, Florian F Behrendt, Mohammed A Eddahabi

  • 1Department of Diagnostic and Interventional Radiology, RWTH Aachen University Hospital, Aachen, Germany. gmuehlen@rad.rwth-aachen.de

European Radiology
|July 25, 2008
PubMed

Insights

This study found no significant difference in chest CT contrast enhancement using 300, 370, or 400 mg iodine/ml contrast media. However, higher iodine concentrations may reduce patient discomfort after injection.

Area of Science:

  • Radiology
  • Medical Imaging
  • Contrast Media

Background:

  • Computed tomography (CT) utilizes various contrast media with differing iodine concentrations.
  • Optimizing contrast media selection is crucial for diagnostic accuracy in chest CT examinations.

Purpose of the Study:

  • To prospectively compare the efficacy and safety of iodinated contrast media with concentrations of 300, 370, and 400 mg iodine/ml for chest CT.
  • To evaluate intravascular enhancement, image quality, and patient-reported discomfort across different contrast concentrations.

Main Methods:

  • A prospective study involving 300 patients undergoing chest CT.
  • Patients received contrast media with 300, 370, or 400 mg iodine/ml, with adapted injection protocols for identical iodine delivery rate (1.3 mg/s) and total iodine load (33 g).
  • Intravascular attenuation was measured in the pulmonary trunk and ascending aorta; subjective image quality and patient discomfort were assessed.

Main Results:

  • No statistically significant differences in contrast enhancement were observed in the pulmonary trunk (p = 0.3198) or ascending aorta (p = 0.0840) among the three contrast media groups.
  • Subjective image quality (p = 0.0176) and discomfort during injection (p = 0.7034) were comparable across all groups.
  • General discomfort after injection was significantly higher for the 300 mg iodine/ml group compared to the 370 mg iodine/ml group (p = 0.00019).

Conclusions:

  • Contrast media concentrations of 300, 370, and 400 mg iodine/ml yield comparable intravascular enhancement in chest CT when iodine delivery rates and loads are identical.
  • Higher iodine concentrations (e.g., 370 mg/ml) may be associated with reduced post-injection patient discomfort.
  • The choice of contrast media concentration in chest CT can be guided by both diagnostic efficacy and patient tolerance.

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