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Evaluation of CT coronary artery angiography with 320-row detector CT in a high-risk population
1Department of Medical Imaging, Jinan Military General Hospital, Jinan, Shandong Province, China. cjr.sungang@vip.163.com
Insights
320-detector row dynamic volume CT (DVCT) accurately detects coronary artery disease (CAD) without heart rate control. Controlling heart rate below 70 bpm significantly reduces radiation dose, making DVCT a valuable tool for high-risk patients.
Area of Science:
- Cardiovascular Imaging
- Radiology
- Medical Diagnostics
Background:
- Coronary artery disease (CAD) poses a significant health risk, necessitating accurate diagnostic methods.
- 320-detector row dynamic volume CT (DVCT) is an advanced imaging technique for evaluating coronary arteries.
- High-risk populations require precise and safe diagnostic tools for CAD detection.
Purpose of the Study:
- To prospectively assess the diagnostic accuracy of DVCT for CAD detection in high-risk patients.
- To evaluate the radiation dose associated with DVCT in this population.
- To compare DVCT performance with invasive coronary angiography (ICA).
Main Methods:
- 60 high-risk patients underwent DVCT without heart rate control.
- Invasive coronary angiography (ICA) served as the gold standard for comparison.
- Per-segment analysis was used to determine diagnostic accuracy metrics.
Main Results:
- DVCT demonstrated high diagnostic accuracy for CAD detection (sensitivity 95.3%, specificity 97.6%).
- Diagnostic accuracy was similar across heart rate subgroups, but lower in patients with Agatston score ≥100.
- Mean effective radiation dose was 12.5 ± 9.4 mSv, significantly lower than ICA (14.1 ± 5.9 mSv).
- Radiation dose was significantly lower (5.2 ± 0.9 mSv) when heart rate was <70 bpm compared to >70 bpm (22.6 ± 5.2 mSv).
Conclusions:
- DVCT provides reliable and high diagnostic accuracy for CAD detection, even without heart rate control.
- Heart rate control (<70 bpm) is recommended to minimize radiation exposure during DVCT.
- DVCT is a valuable non-invasive tool for evaluating coronary artery stenosis in high-risk individuals.
Objectives:
The aim of this article was to prospectively evaluate the accuracy and radiation dose of 320-detector row dynamic volume CT (DVCT) for the detection of coronary artery disease (CAD) in a high-risk population.
Methods:
60 patients with a high risk of CAD underwent DVCT without preceding heart rate control and also underwent invasive coronary angiography (ICA), which served as the standard reference.
Results:
On a per segment analysis, overall sensitivity was 95.3%, specificity was 97.6%, positive predictive value was 90.6%, negative predictive value was 98.8% and Youden index was 0.93. In both heart rate subgroups, diagnostic accuracy for the assessment of coronary artery stenosis was similar. The accuracy of the subgroup with an Agatston score ≥100 was lower than that for patients with an Agatston score <100. However, the difference between DVCT and ICA results was not significant (p=0.08). The mean estimated effective dose of CT was 12.5 ± 9.4 mSv. In those patients with heart rates less than 70 beats per minute (bpm), the mean radiation exposure of DVCT was 5.2 ± 0.9 mSv. The effective radiation dose was significantly lower than that of ICA (14.1 ± 5.9 mSv) (p<0.001). When the heart rate was >70 bpm, a significantly higher dose was delivered to patients with DVCT (22.6 ± 5.2 mSv, p<0.001) than with ICA (15.0 ± 5.3 mSv, p<0.001).
Conclusion:
DVCT reliably provides high diagnostic accuracy without heart rate/rhythm control. However, from a dosimetric point of view, it is recommended that heart rate should be controlled to <70 bpm to decrease radiation dose.
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