应用心电脉冲技术降低64层螺旋CT冠状动脉成像的辐射剂量  

Reducing radiation dose with electrocardiogram-pulsing technique in 64-row multi-slice spiral CT coronary angiography

作　　者：吴旻[1] 杨明[1] 靳激扬[1] 仲纲才[1] 秦智[1] 范洁[2] 黎玲玲[1] 滕皋军[1] 

机构地区：[1]东南大学附属中大医院放射科,南京210009 [2]江苏省中医院放射科

出　　处：《中华放射学杂志》2009年第7期693-696,共4页Chinese Journal of Radiology

摘　　要：目的评价心电脉冲（ECG-pulsing）技术对降低CT冠状动脉成像射线剂量的价值及其对图像质量的影响。方法2007年10月26日到2008年3月12日期间，配合良好，心率控制在80次／min以下，且心律齐的连续受检者59例，采用完全随机化分组方法分为2组，组1（29例）使用传统方法进行CT冠状动脉成像检查，组2（30例）使用ECG—pulsing技术，通过CT机自动得到平均容积cT剂量指数（CT dose index volume，CTDIvol）和剂量长度乘积（dose length product，DLP），计算出相应的有效剂量（effective dose，ED）。获得的图像通过双盲法进行质量评分，对两组CTDIvol值、ED值及图像质量评分用t检验进行比较。结果（1）组1和组2的CTDIvol值分别为（70．0±1．1）和（39．0±2．7）mGy，ED值分别为（16．8±2．0）和（9．5±1．7）mSv，两者之间差异均有统计学意义（t值分别为57．675、15．346，P值均〈0．01）。（2）组1和组2冠状动脉各段图像质量平均评分分别为：组1（3．8±0．2）分，组2（3．8±0．1）分，差异无统计学意义（t=-0．222，P〉0．05）。结论64层螺旋CT冠状动脉造影检查时合理运用ECG—pulsing技术可大幅度降低辐射剂量且不影响图像质量。Objective To evaluate the value of reducing radiation dose with ECG-pulsing and image quality in 64-row multi-slice CT coronary angiography. Methods Fifty-nine consecutive patients whose heart rates were less than 80 beat per minute and cardiac rhythm was regular were randomly divided into two groups from October 26, 2007 to March 12, 2008. Conventional technique of CT coronary angiography was employed in group 1, while ECG-pulsing technique was applied in group 2. CT dose index volume （CTDIvol） and dose length product （DLP） were obtained automatically, and then the corresponding effective dose （ED） were calculated. The quality scores were performed on obtained imaging by using double blind method. Student t-test was applied in the comparison of value of CTDIvol, value of ED and quality of imaging between two groups. Results The value of CTDIvol was （ 70. 0 ± 1.1 ） and （39. 0± 2. 7） mGy, the value of ED was （16.8 ±2.0） and （9.5±1.7） mSv in group 1 and group 2, respectively, which reached statistically significant differences between the groups （t = 57. 675,15. 346, P 〈0. 01, respectively）. The quality scores of coronary images were 3.8 ± 0. 2 and 3.8 ± 0. 1 in the groups, which did not reach the statistical significance （ t = - 0. 222, P 〉 0. 05 ）. Conclusions The proper application of ECG-Pulsing technology in 64-slice spiral CT coronary angiography can reduce radiation dose significantly while having no influence on the quality of the imaging.

关 键 词：体层摄影术 X线计算机 冠状动脉疾病 辐射剂量 辐射防护 

分 类 号：R686[医药卫生—骨科学]