Publication

Quantitative Assessment of Coronary Artery Stenosis Severity and of Atherosclerotic Plaque Composition Using 256-slice Computed Tomography

Cardiac

Eur Radiol. 2010 Aug; 20(8):1841-50. Epub 2010 Mar 20.

Authors:

G. Korosoglou, D. Mueller, S. Lehrke, H. Steen, W. Hosch, T. Heye, HU. Kauczor, E. Giannitsis, HA. Katus

Summary

The study evaluates the diagnostic accuracy and reproducibility of 256-slice CT angiography (CTA) for quantifying coronary stenosis and analyzing plaque composition, using quantitative coronary angiography (QCA) as the reference standard.

Key findings:

  • Stenosis Assessment: CTA demonstrated a strong correlation with QCA for stenosis quantification (r² = 0.79, p < 0.001). For detecting ≥50% and ≥75% diameter stenosis, CTA achieved sensitivity, specificity, and accuracy of 86%, 95%, 90% and 89%, 100%, 96%, respectively.
  • Plaque Analysis: CTA reliably differentiated plaque types (non-calcified, mixed, calcified) with high inter-observer reproducibility (kappa = 0.86). Plaque volume measurements showed low variability (inter-observer: 13%, intra-observer: 9%).
  • Composition Insights: Mixed and non-calcified plaques were strongly associated with luminal narrowing, while calcified plaques correlated with stable lesions.

The study concludes that 256-slice CTA is a robust, non-invasive tool for both stenosis quantification and comprehensive plaque evaluation in symptomatic patients, offering high diagnostic accuracy and reproducibility comparable to invasive QCA.

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