Korean Journal of Radiology

The Korean Society of Radiology (대한영상의학회)
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Prospectively Electrocardiogram-Gated High-Pitch Spiral Acquisition Mode Dual-Source CT Coronary Angiography in Patients with High Heart Rates: Comparison with Retrospective Electrocardiogram-Gated Spiral Acquisition Mode

  • Sun, Kai (Department of Radiology, Baotou Central Hospital) ;
  • Han, Rui-Juan (Department of Cardiology, Baotou Central Hospital) ;
  • Ma, Li-Jun (Department of Radiology, Baotou Central Hospital) ;
  • Wang, Li-Jun (Department of Radiology, Baotou Central Hospital) ;
  • Li, Li-Gang (CT BM Clinic Marketing, Siemens Healthcare) ;
  • Chen, Jiu-Hong (CT BM Clinic Marketing, Siemens Healthcare)
  • Published : 2012.12.01
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Abstract

Objective: To assess the image quality and effective radiation dose of prospectively electrocardiogram (ECG)-gated high-pitch spiral acquisition mode (flash mode) of dual-source CT (DSCT) coronary angiography (CTCA) in patients with high heart rates (HRs) as compared with retrospectively ECG-gated spiral acquisition mode. Materials and Methods: Two hundred and sixty-eight consecutive patients (132 female, mean age: 55 ${\pm}$ 11 years) with mean HR > 65 beats per minute (bpm) were prospectively included in this study. The patients were divided into two groups. Collection was performed in group A CTCA using flash mode setting at 20-30% of the R-R interval, and retrospectively ECG-gated spiral acquisition mode in group B. The image noise, contrast-to-noise ratio (CNR), image quality scores, effective radiation dose and influencing factors on image quality between the two groups were assessed. Results: There were no significant differences in image quality scores and proportions of non-diagnostic coronary artery segments between two groups (image quality scores: 1.064 ${\pm}$ 0.306 [group A] vs. 1.084 ${\pm}$ 0.327 [group B], p = 0.063; proportion of non-diagnostic coronary artery segments: segment-based analysis 1.52% (group A) vs. 1.74% (group B), p = 0.345; patient-based analysis 7.5% (group A) vs. 6.7% (group B), p = 0.812). The estimated radiation dose was 1.0 ${\pm}$ 0.16 mSv in group A and 7.1 ${\pm}$ 1.05 mSv in group B (p = 0.001). Conclusion: In conclusion, in patients with HRs > 65 bpm without cardiac arrhythmia, the prospectively high-pitch spiral-acquisition mode with image-acquired timing set at 20-30% of the R-R interval provides a similar image quality and low rate of non-diagnostic coronary segments to the retrospectively ECG-gated low-pitch spiral acquisition mode, with significant reduction of radiation exposure.

Keywords

References

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