320排CT冠状动脉造影调整临界心率采集方案的初步应用  

Preliminary Application of Modified Critical Heart Rate Acquistion Scheme for 320 Row CT Coronary Angiography

作　　者：叶国伟[1] 邹建勋[1] 陈旭高[1] 姜敏霞[1] 季中[1] 

机构地区：[1]浙江省丽水市人民医院放射科

出　　处：《中国医学计算机成像杂志》2015年第6期587-590,共4页Chinese Computed Medical Imaging

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（P〈0.001）。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。Purpose： To analyze the image quality and radiation dose of 320 row CT coronary artery angiography with modified acquisition scheme for critical heart rate. Methods： Forty patients with heart rate of 66-68 bpm and 10 patients with heart rate of 80-82 bpm after breath training were enrolled.The automatic system acquisition scheme setting for the patients with 66-68 bpm was two beat,30%-80% RR interval （control gruop B1）, and the modified acquisition scheme setting was one beat,70%-80% RR interval （study gruop A1）. The automatic system acquisiton scheme setting for the patients with 80-82 bpm was three beat,30%-80% RR interval （control group B2）, and the modified acquisition scheme setting was two beat,30%-80% RR interval （study group A2）.The radiation dose of group A1 and A2 was automatically generated on the CT scanner.While the radiation dose of group B 1 and B2 was obtained by simulating the same CT scanning protocol of group A1,A2. The image quality and radiation dose of A1,A2 and B 1,B2 gruop were analyzed and compared.Results：The percent of coronary artery segments that can be assessed and can not be assessed in group A1,A2 were 96.47% （579/600）, 3.53% （21/600）, and 95.36%（ 143/150）, 4.31% （17/150）. The percent of the coronary arteries in group A1 with the image quality of grade 1-grade 4 was 98.82% （572/579） , 0.9%（5/579）, 0.28%（2/579） and 0, respectively.And that in group A2 was 96.86%（137/143）,1.2%（2/143）, 1.94%（3/143） and 0, respectively.The average radiation dose of A1 and A2 group was （2.36±0.21） mSv and （4.36±0.81） mSv. The average radiation dose of B 1 and B2 group was （4.31±0.5） mSv and （6.35±1.81） mSv. There were significant differences of the average radiation dose between group A and gruop B （P 〈 0.001）. Conclnsion： Modified 320 row CT coronary artery angiography acquisition scheme for patients with critical heart rate may ensure the requirement of diagnosis, and the absorbed doses of patients can be

关 键 词：冠状动脉成像:体层摄影术 X线计算机 血管造影术 心率 

分 类 号：R816.2[医药卫生—放射医学]