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[Influence of heart rate on image quality and detection of coronary stenoses with multislice spiral CT]

M Mennicke1, T Giesler, D Ropers

  • 1Medizinische Klinik II, Universität Erlangen-Nürnberg, Deutschland. maria_mennicke@web.de

Biomedizinische Technik. Biomedical Engineering
|December 6, 2002
PubMed

Insights

Multi-slice spiral CT effectively detects coronary artery stenosis. However, higher heart rates increase motion artifacts, reducing detection accuracy and making arteries unevaluable.

Area of Science:

  • Cardiovascular Imaging
  • Medical Diagnostics

Background:

  • Multi-slice spiral CT (MSCT) is a key tool for diagnosing coronary artery disease.
  • Patient heart rate (HR) is a known factor influencing image quality in cardiac CT.

Purpose of the Study:

  • To evaluate the impact of patient heart rate during MSCT on the detection of coronary stenoses.
  • To assess the relationship between heart rate and the occurrence of motion artifacts in MSCT scans.

Main Methods:

  • Retrospective ECG-gated image reconstruction was performed on 100 patients who underwent MSCT.
  • Coronary arteries were analyzed for stenosis detection and presence of motion artifacts.
  • Correlation between heart rate and image quality/stenosis detection rates was examined.

Main Results:

  • 29% of coronary arteries were unevaluable, primarily due to motion artifacts (84/115).
  • In evaluable arteries, MSCT demonstrated high sensitivity (91%) and specificity (89%) for stenosis detection.
  • Increasing HR significantly increased unevaluable arteries and decreased overall sensitivity from 62% (HR ≤ 70 bpm) to 33% (HR > 70 bpm).

Conclusions:

  • MSCT is capable of detecting coronary stenoses.
  • Image quality, evaluability, and diagnostic accuracy of MSCT for coronary stenosis are significantly compromised by elevated heart rates.

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