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Related Concept Videos

Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
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Related Experiment Video

Updated: May 8, 2026

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Photon counting detector CT contrast agent-reduced transcatheter aortic valve reconstruction planning: a comparative

Yannik C Layer1, Alexander Isaak2, Narine Mesropyan2

  • 1Department of Diagnostic and Interventional Radiology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany. yannik.layer@ukbonn.de.

European Radiology
|May 6, 2026
PubMed
Summary

Photon counting detector CT (PCDCT) allows for reduced contrast media in transcatheter aortic valve reconstruction (TAVR) planning. Virtual monoenergetic reconstructions maintain diagnostic image quality while conserving contrast agents.

Keywords:
Contrast mediaDose reductionIodine signalPhoton-counting detector computed tomographyTAVR planning

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Published on: December 9, 2021

Area of Science:

  • Medical Imaging
  • Radiology
  • Cardiovascular Imaging

Background:

  • Reducing contrast media is crucial for patient safety, environmental impact, and mitigating supply chain issues.
  • Transcatheter aortic valve reconstruction (TAVR) planning requires high-quality imaging, often necessitating significant contrast agent volumes.
  • Photon counting detector CT (PCDCT) offers advanced imaging capabilities that may allow for contrast dose optimization.

Purpose of the Study:

  • To evaluate the efficacy of contrast agent-reduced CT protocols for TAVR planning using PCDCT.
  • To assess if reduced contrast media volumes can be used while maintaining diagnostic image quality.
  • To investigate the role of virtual monoenergetic reconstructions (VMI) in optimizing image quality with reduced contrast.

Main Methods:

  • A retrospective study included 162 BMI-matched TAVR planning examinations on PCDCT.
  • Examinations were divided into standard contrast media dose (SCD; 80 mL) and reduced contrast media dose (RCD; 50 mL).
  • Virtual monoenergetic reconstructions (VMI) at 70, 60, and 50 keV were generated for RCD datasets and compared to polyenergetic images. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were quantitatively assessed, alongside qualitative diagnostic quality.

Main Results:

  • Reduced contrast dose (RCD) on PCDCT led to a decrease in averaged SNR (8.71%) and CNR (16.78%) compared to SCD (p < 0.001).
  • VMI at 50 keV (VMI50keV) significantly increased SNR by 44.10% and CNR by 52.73% (p < 0.001) compared to SCD.
  • In the ascending aorta, SNR and CNR were significantly improved with RCDVMI50keV compared to SCD. Median contrast intensity was preserved with RCDVMI50keV.

Conclusions:

  • Contrast agent-reduced CT protocols for TAVR planning using PCDCT maintain diagnostic efficacy.
  • The use of low-keV VMI reconstructions effectively compensates for reduced iodine concentration, preserving image quality.
  • This approach offers a practical method for conserving contrast media, benefiting patients and the environment.