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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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New horizons in cardiac CT.

A M den Harder1, M J Willemink1, P A de Jong1

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Cardiovascular CT angiography (CCTA) now uses significantly lower radiation doses. Advanced techniques like FFR-CT can assess coronary artery disease, potentially replacing invasive procedures and improving patient selection for interventions.

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Area of Science:

  • Radiology
  • Cardiovascular Imaging
  • Medical Physics

Background:

  • Cardiovascular computed tomography angiography (CCTA) historically involved high radiation doses.
  • Technological advancements have enabled significant dose reduction in CCTA.

Purpose of the Study:

  • To review recent advancements in CCTA technology and their impact on radiation dose and diagnostic capabilities.
  • To highlight the potential of non-invasive fractional flow reserve derived from CCTA (FFRCT) for guiding coronary interventions.
  • To discuss emerging CT technologies like dual-energy and photon-counting CT.

Main Methods:

  • Review of technological innovations in CCTA acquisition, including tube current modulation, automatic tube potential selection, high-pitch prospective ECG-triggering, and iterative reconstruction.
  • Discussion of computational methods for deriving fractional flow reserve from CCTA (FFRCT).
  • Overview of dual-energy CT and photon-counting CT hardware developments and their applications.

Main Results:

  • Modern CCTA techniques achieve dose reductions of approximately one order of magnitude, often below 1 mSv.
  • FFRCT shows promise as a non-invasive alternative to invasive FFR for selecting patients for coronary intervention.
  • Dual-energy CT improves imaging in challenging cases (e.g., high calcium burden) and enhances myocardial perfusion imaging.
  • Photon-counting CT offers potential for further dose reduction, improved spatial resolution, and novel contrast agents.

Conclusions:

  • CCTA has evolved into a low-dose imaging modality with enhanced diagnostic capabilities.
  • FFRCT represents a significant step towards non-invasive assessment of coronary artery disease severity.
  • Future CT technologies, particularly photon-counting CT, hold substantial promise for advancing cardiovascular imaging.