Force CT大螺距Turbo Flash与回顾性心电门控扫描模式在冠状动脉成像图像质量及辐射剂量比较的研究

Comparison of Image Quality and Radiation Dose between CT HighPitch Turbo Flash and Retrospective Electrocardiogated Scanning Mode in Coronary Artery Imaging

目的比较第三代双源Force CT大螺距Turbo Flash与回顾性心电门控冠状动脉成像(CTCA)图像质量及辐射剂量。方法收集2023年1-3月接受CTCA检查患者136例,采用大螺距Turbo Flash P组、回顾性心电门控R组,按照心率≤65次/min分P1、R1组,心率>65次/min分P2、R2组,对冠状动脉图像质量进行主观评分,比较剂量长度乘积(DLP)、辐射剂量(ED)。结果P组95.36%、R组95.72%的节段能够满足图像质量要求(P>0.05),P组及R组的年龄、BIM、心率、心率变化值、DLP、ED差异均无统计学意义(P>0.05),P组DLP为44.100(34.8,52.32)mGy·cm,ED为0.617(0.5,0.7)mSv,R组DLP为425.500(365.0,489.1)mGy·cm,ED为5.957(5.0,6.8)mSv,差异均有统计学意义(P<0.05)。图像质量评分右冠状动脉、总体评分P1与P2、P2与R2差异均有统计学意义(P<0.05),余冠脉分段差异无统计学意义(P>0.05),结论Force CT大螺距Turbo Flash扫描模式图像质量佳、成功率高,有效辐射剂量低,可作为低心率患者的优选检查方法,高心率患者所得冠状动脉图像能够满足诊断要求。

Objective To compare the image quality and effective radiation dose of the third-generation dual-source Force CT coronary angiography(CTCA)with Turbo Flash and retrospective ECG-gated mode.Methods A total of 136 patients receiving CTCA examination from January to March 2023 were randomly assigned to large pitch Turbo Flash P group and retrospective electrocardiogated scan R group,the patients were divided into P1 group and R1 group according to heart rate≤65 beats/min,heart rate>65 times/min were divided into P2 group and R2 group.The image quality of coronary artery was subjectively scored,and the dose length product(DLP)and effective radiation dose(ED)were compared.Results 95.36%in group P and 95.72%in group R met the image quality requirements.There was no significant difference between the two groups(P>0.05).There were no significant differences in age,BIM,heart rate,heart rate variation,DLP and ED between P group and R group(P<0.05).The DLP and ED were 4.100(34.8,52.32)mGy·cm and 0.617(0.5,0.7)mSv in group P and 425.500(365.0,489.1)mGy·cm and 5.957(5.0,6.8)mSv in group R,respectively.The differences were statistically significant(P<0.05).There were significant differences in image quality score of right coronary artery,overall score of P1 and P2,P2 and R2(P<0.05).There was no significant difference in the remaining coronary artery segments(P>05).Conclusion Force CT high-pitch Turbo Flash scanning mode has high success rate,good image quality,and low effective radiation dose,which can be used as the first choice for patients with low heart rate.Coronary artery images obtained from patients with high heart rate can meet the diagnostic requirements.