64排VCT XT前瞻性心电门控低剂量技术对冠状动脉成像的研究  

Study of dose reduction using prospective electrocardiography-triggered coronary scan with 64-slice VCT XT

作　　者：张维权[1] 初国新[1] 黄兴[1] 吴祥才[1] 张丹木[1] 陈志仁[1] 

机构地区：[1]吉林省人民医院放射科,吉林长春130021

出　　处：《吉林医学》2009年第21期2556-2558,共3页Jilin Medical Journal

摘　　要：目的:评价64排VCTXT前瞻性心电门控低剂量技术对冠状动脉成像的能力及图像质量分析。方法:连续选取152例行冠状动脉CTA检查的患者(A组平均体重指数25.1,心率<65次/min)行前门控扫描,根据患者的自动毫安量选择管电流及管电压。同时比较回归性心电门控螺旋扫描的30例患者(B组平均体重指数25.7,心率<72次/min)的剂量,并对两组图像质量进行评价(配对t检验,P<0.005为差异有统计学意义)。结果:A组前瞻性门控横断面扫描冠状动脉成像射线剂量平均为(2.75±0.95)mSv,所获图像质量完全达到临床诊断需要,B组回顾性心电门控螺旋扫描冠状动脉成像平均剂量为(18.2±2.9)mSv。B组与A组比较差异有统计学意义,射线剂量减少了85.2%。结论:64排VCTXT前瞻性心电门控技术横断面扫描能满足临床诊断需要,同时也非常有效的降低了辐射剂量。Objective To compare radiation dose and image quality between prospective electocardiograph-triggered axial scan and retrospective ECG-gatechelical scan in coronary 64-slice CT angiography（CTA）.Method Total 152 consecutive patients：group A：Average body mass index（BMI）：25.1,heart rate〈65 bpm underwent 64-slice CTA.Using prospective ECG-triggered axial scan protal（120kV automA preference）;group B：Average body mass index（BMI）：25.7,heart rate〈72 bpm.The image quality was blindly evaluated between group A and group ,B （paired test was used and P 〈 0. 05 as a significant difference）. Results There was significant difference （ t = 18.5, P 〈 0.01 ） between radiation dose of group A [ （ 2. 75 ±0.95 ） mSv ] and that of group B [ （ 18.2 ±2. 9 ） mSv ], decreased by 85.2%. The image quality of group A could fulfill clinical diagnosis needs. The average radiation dose of using helical scan without optimi- zation was 17.29 mSv which was similar to that of group B （ 18. 13 mSv）. Conclusion Prospetive ECG - trigered axial scan in 64 - slice coronary CTA can significantly reduce radiation exposure and the image quality can fulfill clinical diagnosis needs.

关 键 词：64排VCTXT 心电门控低剂量技术 冠状动脉成像 

分 类 号：R816.2[医药卫生—放射医学]