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Optimize scan timing in abdominal multiphase CT: Bolus tracking with an individualized post-trigger delay.

Juan Yu1, Shushen Lin2, Hao Lu1

  • 1The Department of Radiology, The First Affiliated Hospital of Zhengzhou University, No.1, Eastern Jianshe Road, Zhengzhou 450052, Henan Province, China.

European Journal of Radiology
|January 12, 2022
PubMed
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An individualized post-trigger delay in abdominal multiphase CT improves objective image quality during the arterial phase. This method optimizes contrast enhancement without negatively impacting diagnostic confidence compared to fixed delays.

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AbdomenBolus trackingComputed tomographyScan timing

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Area of Science:

  • Radiology
  • Medical Imaging
  • Computed Tomography

Background:

  • Bolus tracking in multiphase CT enhances contrast visualization.
  • Conventional fixed post-trigger delays may not be optimal for all patients.
  • Optimizing contrast delivery is crucial for accurate abdominal CT interpretation.

Purpose of the Study:

  • To compare image quality and diagnostic confidence between individualized and fixed post-trigger delays in abdominal multiphase CT.
  • To evaluate the impact of different bolus tracking strategies on quantitative and qualitative imaging parameters.

Main Methods:

  • 104 patients underwent abdominal multiphase CT using either individualized or fixed (11s) post-trigger delay.
  • Quantitative (enhancement, noise, SNR, CNR) and qualitative (image quality, diagnostic confidence) parameters were assessed.
  • Statistical analysis included Mann-Whitney U, independent t-tests, and Kappa analysis.

Main Results:

  • Individualized delays yielded higher arterial phase attenuation and significantly better liver, pancreas, and portal vein CNR.
  • Signal-to-noise ratios (SNRs) for liver, pancreas, and aorta were comparable between groups.
  • Subjective image quality and diagnostic confidence were similar for both strategies.

Conclusions:

  • Individualized post-trigger delay optimizes objective image quality in the arterial phase of abdominal multiphase CT.
  • This approach enhances contrast-to-noise ratios without compromising diagnostic confidence.
  • Individualized bolus tracking represents an advancement for abdominal CT imaging.