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目的:评价新双源CT Flash螺旋心脏扫描技术在低心率患者低剂量冠状动脉成像中的应用价值。方法:120例心率≤70次/min且心律规整、心率波动范围10次/min以下、体质指数(BMI)20～24、行冠状动脉血管成像患者随机分成A组和B组,A组(60例)行Flash螺旋心脏扫描模式,采集一个心动周期心脏图像,预设采集期相为60%R-R间期;B组(60例)行前瞻性心电触发序列扫描模式,采集3～4个心动周期心脏图像,预设采集期相为70%R-R间期。由2名医师分别对两组冠状动脉树的13段图像质量进行分析评分,并对辐射剂量进行统计,两组差异性用独立样本t检验。结果:两组图像质量评分A组为(4.58±0.62)分,B组为(4.55±0.72)分,差异无统计学意义(t=0.271,P=0.787);A组辐射平均有效辐射剂量(0.75±0.13)mSv,B组平均有效辐射剂量(2.35±0.19)mSv,两组间差异有统计学意义(t=-52.621,P=0.000)。结论:在严格控制入选标准前提下,Flash螺旋心脏扫描模式可在保证诊断所需的图像质量的同时,又能较大程度降低辐射剂量。
Objective: To evaluate the value of new dual-source CT Flash spiral heart scanning in low-dose coronary angiography in patients with low heart rate. Methods: A total of 120 patients with heart rate ≤ 70 beats / min and regular heart rhythm, heart rate fluctuation range of 10 beats / min, and BMI of 20 to 24 were randomly divided into A group and B group. A group (60 For example, a spiral heart scan mode was performed to acquire a cardiac image of a cardiac cycle with a preset collection phase of 60% RR interval. Group B (60 patients) underwent a prospective ECG-triggered sequential scan mode to collect 3 to 4 cardiac events Periodic heart image with a pre-set acquisition phase of 70% RR interval. Two physicians analyzed the image quality of the 13 segments of the coronary arteries of two groups separately and counted the radiation dose. The differences between the two groups were analyzed by independent sample t-test. Results: The average quality of radiation in group A was (4.58 ± 0.62) in group A and (4.55 ± 0.72) in group B, with no significant difference (t = 0.271, P = 0.787) (0.75 ± 0.13) mSv, and the average effective radiation dose (2.35 ± 0.19) mSv in group B was statistically significant (t = -52.621, P = 0.000). Conclusion: Under strict control of the inclusion criteria, the Flash spiral heart scan mode can reduce the radiation dose to a great extent while ensuring the quality of images required for diagnosis.