【摘要】 目的:探讨320层螺旋CT冠状动脉成像低剂量扫描方法的临床应用价值。方法:采用320层螺旋CT,选取100例临床拟诊为冠心病的患者,随机分为2组:研究组50例,采用改良法(低剂量)回顾性心电门控扫描;对照组50例,采用传统回顾性心电门控扫描。对比分析2组中冠状动脉可评估率及辐射剂量。结果:研究组血管可评估率为95.0%,对照组为95.8%。两组冠状动脉段图像质量比较差异无统计学意义(P>0.05)。实验组平均有效辐射剂量为(2.90±0.37)mSv,对照组为(10.33±1.65)mSv,两组辐射剂量比较差异有统计学意义(P<0.05)。结论:320层螺旋CT冠状动脉成像中,应用改良法回顾性心电门控技术在保证血管可评估率及图像质量的前提下可降低72%的辐射剂量。更多还原

【Abstract】 Objective:To evaluate the method of 320-slice CT with low radiation dose for CT coronary angiography.Methods:Using 320-slice CT,one hundred patients suspected of coronary artery diseases were collected and randomly divided into the study group(improved retrospective ECG-gating coronary artery imaging,50 patients) and the control group(conventional retrospective ECG-gating coronary artery imaging,50 patients).The imaging quality of coronary artery segments and radiation dose were recorded for statistics.Results:The percentage of assessable coronary artery segments was 94.03%(615/654) in the experimental group,whereas 94.68%(605/639) in the control group.There was no significant difference of imaging quality between the two groups(P>0.05).The mean effective dosage(ED) in the experimental group was(2.90±0.37)mSv and(10.33±1.65)mSv in the control group.There was significant difference between radiation dose of the study group and that of the control group(P<0.05).Conclusion:320 slice CT coronary angiography performed with improved retrospective ECG-gating imaging can substantially reduce radiation doses by 72% while preserving good diagnostic image quality.更多还原