Correlations between image quality and radiation dose in prospective and retrospective ECG-gated CT coronary angiography in patients with different heart rates(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2024年第2期
- Page:
- 185-190
- Research Field:
- 医学影像物理
- Publishing date:
Info
- Title:
- Correlations between image quality and radiation dose in prospective and retrospective ECG-gated CT coronary angiography in patients with different heart rates
- Author(s):
- ZHAO Dechun; YU Kebin; LIU Jia; YANG Luxi; ZHU Qi; PAN Zhihua
- Department of Radiology, The Second Affiliated Hospital of Chengdu Medical College (China National Nuclear Corporation 416 Hospital), Chengdu 610051, China
- Keywords:
- Keywords: coronary angiography spiral CT prospective electrocardiogram-gated retrospective electrocardiogram-gated image quality radiation dose
- PACS:
- R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2024.02.010
- Abstract:
- Abstract: Objective To explore the correlations between image quality of prospective and retrospective electrocardiogram (ECG)-gated CT coronary angiogram and radiation dose in patients with different heart rates. Methods A total of 135 patients undergoing 256-slice spiral CT coronary angiography were enrolled in the study. Among them, 66 cases received prospective ECG-gated scanning (prospective ECG-gated group) and further divided into two subgroups with heart rate ≤ 80 beats/min (prospective ECG-gated+low heart rate subgroup, n=39) and >80 beats/min (prospective ECG-gated+high heart rate subgroup, n=27). The other 69 cases underwent retrospective ECG-gated scanning (retrospective ECG-gated group), including 45 cases with heart rate ≤ 80 beats/min (retrospective ECG-gated+low heart rate subgroup) and 24 with heart rate >80 beats/min (retrospective ECG-gated+high heart rate subgroup). The baseline data, image quality ［mean CT value, image noise, signal-to-noise ratio (SNR), subjective image quality score］ and radiation dos ［CT volume dose index (CTDIvol), dose length product (DLP), effective dose (ED)］ were compared among 4 subgroups. The correlations of image quality with heart rate and radiation dose in prospective and retrospective ECG-gated groups were analyzed. Results The heart rates in prospective and retrospective ECG-gated+low heart rate subgroups were lower than those in prospective and retrospective ECG-gated+high heart rate subgroups (P<0.05). When comparing the mean CT value, image noise, SNR and subjective image quality score among 4 subgroups, no statistically significant differences were observed (P>0.05). The CTDIvol, DLP and ED in prospective ECG-gated+low heart rate subgroup were significantly lower than those in the other 3 subgroups (P<0.05), and the indicators in prospective ECG-gated+high heart rate subgroup were lower than those in retrospective ECG-gated group (including low and high heart rate subgroups) (P<0.05). Pearson correlation coefficient analysis revealed that the mean CT value, image noise, SNR, subjective image quality score had no significant correlation with heart rate, CTDIvol, DLP and ED in prospective and retrospective ECG-gated groups (P>0.05). Conclusion The subjective and objective image quality of 256-slice spiral CT coronary angiography is not correlated with radiation dose. Prospective ECG-gated scanning can reduce the radiation dose and ensure the image quality as compared with retrospective ECG-gated scanning. This holds true for eligible patients with high heart rate, and the former can effectively reduce radiation exposure. Therefore, prospective ECG-gated scanning is worthy to be promoted in clinic.
Last Update: 2024-02-27