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Image Quality and Dose Reduction by Dual Source Computed Tomography Coronary Angiography: Protocol Comparison

Ernesto Forte1, Serena Monti1, Chiara Anna Parente1

  • 1IRCCS SDN, Naples, Italy.

Dose-Response : a Publication of International Hormesis Society
|October 24, 2018
PubMed

Insights

Optimizing dual-source CT coronary angiography (DSCT-CTCA) protocols based on heart rate significantly reduces radiation dose. This approach also enhances image quality, improving signal to noise ratio (SNR) and contrast to noise ratio (CNR) for better diagnostic accuracy.

Area of Science:

  • Cardiovascular Imaging
  • Radiology
  • Medical Imaging Technology

Background:

  • 128-slice dual-source computed tomography coronary angiography (DSCT-CTCA) is a key diagnostic tool.
  • Optimizing scan protocols is crucial for balancing image quality and radiation exposure.
  • Heart rate variability impacts image acquisition and diagnostic yield in CTCA.

Purpose of the Study:

  • To compare image quality and radiation dose across different DSCT-CTCA protocols.
  • To evaluate the impact of heart rate on protocol selection and outcomes.
  • To identify optimal DSCT-CTCA protocols for improved patient care.

Main Methods:

  • Retrospective analysis of 90 patients undergoing DSCT-CTCA.
  • Patients grouped by heart rate (HR) and assigned specific acquisition modes (FLASH, step-and-shoot, retrospective ECG-gating).
  • Measurement of signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and effective radiation dose.

Main Results:

  • Higher SNR and CNR observed in the stable, low HR group (Group A) compared to the high HR group (Group C).
  • Significantly lower effective radiation doses in low HR groups (A and B) versus the high HR group (C).
  • Group A (stable HR ≤60 bpm, FLASH mode) demonstrated superior image quality and lowest radiation dose.

Conclusions:

  • Tailoring DSCT-CTCA protocols to patient heart rate is essential for dose reduction.
  • HR-matched protocols improve image quality metrics (SNR, CNR).
  • Selecting appropriate low-dose, HR-matched protocols on DSCT scanners enhances diagnostic efficacy and patient safety.
Abstract

Keywords:
computed tomography coronary angiographycoronary artery diseasedual source computed tomographyimage qualityradiation dose

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