320排CT冠状动脉造影调整临界心率采集方案的初步应用

发布时间：2018-05-08 05:55

本文选题：冠状动脉成像 + 体层摄影术　；参考：《中国医学计算机成像杂志》2015年06期

【摘要】：目的:探讨320排CT冠状动脉造影中调整临界心率采集方案后的图像质量及辐射剂量分析。方法:选取屏气训练时心率为66~68次/分患者40例,80~82次/分患者10例。66~68次/分心率系统自动设定的采集方案为2个beat,RR间期30%~80%时相(对照组B1),方案修改为1个beat,RR间期70%~80%时相(研究组A1)。80~82次/分心率方案由3个beat采集,RR间期30%~80%时相(对照组B2)修改为2个beat采集,RR间期30%~80%时相(研究组A2)。A1、A2组辐射剂量值由CT机自动计算得出,B1、B2组辐射剂量值以A1、A2组相同曝光参数输入CT机后模拟获得。分析A1、A2组图像质量及A1、A2与B1、B2组辐射剂量。结果:A1、A2组可评估和不可评估冠状动脉节段分别为96.47%(579/600)、3.53%(21/600),及95.36%(143/150)、4.31%(17/150)。在可评估冠状动脉节段中,A1组的1分、2分、3分及4分图像分别占98.82%(572/579)、0.9%(5/579)、0.28%(2/579)及0,A2组的1分、2分、3分及4分图像分别占96.86%(138/143)、1.2%(2/143)、1.94%(3/143)及0。A1、A2组平均辐射剂量为(2.36±0.21)m Sv、(4.36±0.81)m Sv。B1、B2组平均辐射剂量为(4.31±0.5)m Sv、(6.35±1.81)m Sv。A组和B组的平均辐射剂量差异有明显统计学意义(P0.001)。结论:基于320排CT冠状动脉造影扫描中,心率有不同程度下降的基础,优化临界心率采集方案,能保证冠状动脉图像的诊断需求,同时能有效降低患者吸收剂量,值得推广。
[Abstract]:Objective: to investigate the image quality and radiation dose analysis of 320-slice CT coronary angiography after adjusting critical heart rate acquisition. Methods: 40 patients with heart rate of 660.68 beats / min during breath holding training were selected. 10 patients (10 patients, 10 patients) and 10 patients with heart rate system (HRS) were automatically set up as two batter RR intervals of 30 ~ 80 hours (control group B1, modified to 1 Beat RR interval). The heart rate scheme was revised from three beat acquisition RR intervals (control group B2) to two beat acquisition RR intervals from 30 to 80 timescences (study group A _ (2) 路A _ (1) A _ (2) group radiation dose values were calculated by CT machine automatically to get the radiation of B _ (1) B _ (2) group (A _ (2) + A _ (1) A _ (2) A _ (1) A _ 2 group radiation dose values were calculated automatically by CT machine. The dose values were simulated with A _ 1 A _ 2 group after the same exposure parameters were inputted into CT machine. The image quality of A 1 A 2 group and radiation dose of A 1 A 2 and B 1 B 2 group were analyzed. Results in the 2 groups, there were 96.4747 / 600 / 579 / 300 / 3.53 and 95.3636 / 143 / 150 / 4.31 / 150, respectively, in the assessable and unassessable segments of the coronary artery (n = 96.479 / 600 / 3.53) and 95.3636 / 153 / 150 / 4.31 / 150 / 50 respectively. In the assessable coronary artery segment, the images of 1, 2, 3 and 4 points in A1 group were 98.822 / 572 / 579 / 0.9 and 0.28 / 2 / 579 in group A 2, respectively, and in group A 2, 2, 3 and 4 in 96. 8686 / 13883 / 1 / 1 / 2 / 1 / 2 / 1 / 1 / 1 / 1 / 1 / 1 / 1 of 1.94 / 143) and 0.A1A\ + A\ + 1 / A\ + A\ + 1 / A\% A\ + A\ {1}\ {1}\} 2\%? There was significant difference in average radiation dose between group B and group B (P 0.001). Conclusion: based on 320 slice CT coronary angiography, the heart rate is decreased in varying degrees. Optimizing the critical heart rate acquisition scheme can ensure the diagnostic requirements of coronary artery images, and can effectively reduce the absorbed dose of patients, which is worth popularizing.
【作者单位】：浙江省丽水市人民医院放射科;
【分类号】：R816.2

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