标题：不同追踪触发监测频率对冠状动脉CTA图像质量及辐射剂量的影响

      作者：区贤斌，黄锦炽，梁嘉杰，徐振锋，蔡锋，黄启明    佛山市禅城区中心医院医学影像科，广东 佛山 528000

      卷次： 2019年30卷14期

      【摘要】 目的 探讨不同追踪触发监测频率对冠状动脉CTA图像质量及辐射剂量的影响。方法 选择2016年1月至2018年12月佛山市禅城区中心医院诊治的144例冠心病患者为研究对象，按随机数表法将其分为A (54例)、B (46例)、C (44例)三组，均接受冠状动脉CTA检查，A、B、C三组追踪触发监测频率分别为1.14 s、1.17 s、2.00 s，观察并比较三组冠状动脉CTA图像质量及辐射剂量的差异。结果 A组、B组和C组患者的反折现象比率分别为22.22%、17.39%和 6.82%，差异有统计学意义(P<0.05)；A组、B组和C组患者主动脉根部(AO)的CT值[(486.23±5.02) Hu vs (464.22±6.57) Hu vs (494.17±5.91) Hu]、噪声[(34.25±5.26) vs (32.11±4.25) vs (33.47±4.23)]、信噪比(SNR)[(14.455±3.20) vs (15.23±2.15) vs (14.28±1.32)]和对比信噪比(CNR) [(23.45±10.23) vs (20.23±8.78) vs (25.47±5.56)]比较差异均无统计学意义(P>0.05)；A组、B组和C组患者右冠状动脉近段(RCA)和左主干(LM)中的CT值[(472.44±64.11) Hu vs (455.27±95.21) Hu vs (455.78±62.44) Hu]和CNR [(25.44±7.23) vs (28.47±23.01) vs (28.47±5.26)]以及主观评分[(1.89±0.06)分 vs (1.86±0.04)分 vs (1.88±0.05)分]等指标比较差异均无统计学意义(P>0.05)；A组监测次数为(4.77±2.23)次，高于B组的(3.72±1.44)次和C组的(2.71±0.95)次，而B组又高于C组，差异均有统计学意义(P<0.05)；A组、B组和C组患者辐射剂量中的剂量长度乘积(DLP) [(4.10±2.23) mSv vs (2.15±0.82) mSv vs (1.51±0.53) mSv]和有效剂量(ED) [(0.057±0.031) mSv vs (0.034±0.015) mSv vs (0.023±0.008) mSv]比较，A组均高于B、C两组，B组又高于C组，差异均有统计学意义(P<0.05)。结论 不同追踪触发监测频率获得图像质量均较高，但监测频率为2.00 s时能显著降低监测次数及辐射剂量。
      【关键词】 双源CT；冠状动脉；团注；自动触发技术；冠心病；图像质量
      【中图分类号】 R445 【文献标识码】 A 【文章编号】 1003—6350（2019）14—1823—04

Effects of different tracking trigger monitoring frequencies on the image quality and radiation dose of coronaryCTA.
OU Xian-bin, HUANG Jin-chi, LIANG Jia-jie, XU Zhen-feng, CAI Feng, HUANG Qi-ming. Department of MedicalImaging, Chancheng District Central Hospital, Foshan 528000, Guangdong, CHINA
【Abstract】 Objective To investigate the effect of different tracking trigger monitoring frequencies on the im-age quality and radiation dose of coronary computed tomography angiography (CTA). Methods A total of 144 patientswith coronary heart disease, who admitted to Foshan Chancheng District Central Hospital from January 2016 to Decem-ber 2018, were selected and divided into group A (n=54), group B (n=46) and group C (n=44) according to random num-ber table method. All patients underwent coronary CTA examination, and the tracking trigger monitoring frequencies forgroup A, B and C were 1.14 s, 1.17 s and 2.00 s, respectively. The differences of image quality and radiation dose ofthree groups of coronary CTA were observed and compared. Results The ratio of reflexion in group A, B and C were