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Evaluation of coronary stents and stenoses at different heart rates with dual source spiral CT (DSCT)

Michael M Lell1, Christoph Panknin, Roya Saleh

  • 1Department of Radiological Sciences, David Geffen School of Medicine at UCLA, Los Angeles, California 90095, USA. Michael.Lell@idr.imed.uni-erlangen.de

Investigative Radiology
|June 15, 2007
PubMed

Insights

Dual-source computed tomography (DSCT) effectively visualizes coronary arteries and stents up to 120 bpm without motion artifacts. This advanced CT imaging offers superior quality for evaluating coronary artery disease, even at higher heart rates.

Area of Science:

  • Cardiovascular imaging
  • Medical physics
  • Radiology

Background:

  • Evaluating coronary arteries at high heart rates and with coronary stents is challenging with current CT technology.
  • Dual-source computed tomography (DSCT) offers high temporal resolution (83 ms), potentially overcoming heart rate limitations.

Purpose of the Study:

  • To assess the efficacy of DSCT in visualizing coronary arteries and stents under simulated high heart rates and motion.
  • To evaluate image quality and measurement accuracy of DSCT for coronary artery stenosis and in-stent evaluation.

Main Methods:

  • Simulated cardiac motion using a robotic device with vessel phantoms (2-4 mm diameter) containing 50% stenosis or stents.
  • DSCT scans performed at simulated heart rates from 50-120 bpm.
  • Analysis of motion artifacts, lumen diameter measurements, and heart rate dependence of errors.

Main Results:

  • Coronary stenoses and stents were visualized without motion artifacts up to 120 bpm.
  • Image quality was comparable between static and dynamic (50-120 bpm) scans.
  • Low errors for normal/stenotic lumen measurements (1-2%), but higher for in-stent measurements (27-32%).

Conclusions:

  • DSCT enables clear depiction of coronary stents across a wide range of simulated heart rates without motion artifacts.
  • Image quality achieved with DSCT surpasses previous CT scanner generations for coronary artery evaluation.
Abstract

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