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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Coronary Plaque Quantification with Ultrahigh-Spatial-Resolution Photon-counting Detector CT: Intraindividual

Milán Vecsey-Nagy1,2, Giuseppe Tremamunno1,3, U Joseph Schoepf1

  • 1Department of Radiology and Radiological Science, Medical University of South Carolina, Ashley River Tower, 25 Courtenay Dr, Charleston, SC 29425.

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|March 4, 2025
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Photon-counting detector (PCD) CT significantly reduces coronary plaque volume and improves the measurement of low-attenuation plaque compared to energy-integrating detector (EID) CT. This advanced imaging technique enhances plaque characterization and reproducibility in coronary CT angiography.

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Area of Science:

  • Cardiovascular Imaging
  • Radiology
  • Medical Physics

Background:

  • Photon-counting detector (PCD) CT offers improved spatial resolution beyond enhanced stenosis measurements.
  • PCD CT may impact quantitative plaque assessment in coronary CT angiography (CCTA).

Purpose of the Study:

  • To evaluate the effect of PCD CT on coronary plaque quantification and characterization.
  • To compare PCD CT plaque assessment with energy-integrating detector (EID) CT.

Main Methods:

  • Consecutive patients underwent CCTA using EID CT and ultrahigh-spatial-resolution (UHR) PCD CT within 30 days.
  • PCD CT utilized equivalent or lower dose and contrast volume compared to EID CT.
  • Total, calcified, fibrotic, and low-attenuation plaque volumes were quantified; reproducibility was assessed.

Main Results:

  • PCD CT showed a nearly one-third reduction in total plaque volume compared to EID CT (723.5 mm³ vs 1084.7 mm³).
  • Fibrotic plaque volume was lower, and low-attenuation plaque volume was higher with PCD CT.
  • PCD CT demonstrated superior intra- and interreader reproducibility for low-attenuation plaque measurements compared to EID CT.

Conclusions:

  • PCD CT UHR imaging significantly reduces segmented coronary plaque volume compared to EID CT.
  • PCD CT improves the reproducibility of low-attenuation plaque measurements, aiding in more accurate plaque characterization.
  • These findings highlight PCD CT's potential to advance quantitative plaque assessment in CCTA.