【摘要】 目的 探讨CT冠状动脉造影(CTCA)不同浓度对比剂对冠状动脉管腔内CT值、冠状动脉显示图像质量的影响。方法前瞻性选取进行CTCA检查者93例,随机分为3组应用不同对比剂浓度,即320 mgⅠ/mL组30例,350 mgⅠ/mL组35例,370mgⅠ/mL组28例。比较3组冠状动脉管腔CT值、冠状动脉显示图像质量的差异。结果 3组左冠状动脉、右冠状动脉、升主动脉根部管腔CT值以及冠状动脉显示质量比较均无统计学差异(P>0.05)。320 mgⅠ/mL组容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP)、有效剂量(ED)均低于350 mgⅠ/mL组、370 mgⅠ/mL组,差异有统计学意义(P<0.05)。结论 采用低浓度对比剂进行CTCA检查,可获得较好的图像质量,并能降低辐射剂量,320 mgⅠ/mL对比剂浓度可用于CTCA。更多还原

【Abstract】 Objective To investigate the effects of different concentrations of contrast medium on CT value in coronary artery lumen and the image quality of coronary artery display in computed tomography coronary a ngiography(CTCA).Methods A total of93 CTCA examiners were prospectively selected and randomly divided into three groups with different contrast medium concentrations:30 cases in the 320 mg I/mL group,35 cases in the 350 mg I/mL group,and 28 cases in the 370 mg I/mL group.The CT value of the coronary artery lumen and the image quality of the coronary artery display were compared among the three groups.Results There was no significant difference in CT value of the left coronary artery,right coronary artery,ascending aorta root lumen,and coronary artery display quality among the three groups(P>0.05).The volume CT dose index(CTDlvol),dose length product(DLP),and effective dose(ED) of the 320 mg I/mL group were lower than those of the 350 mg I/mL and 370 mg I/mL groups.The difference was statistically significant(P<0.05).Conclusion Using a low-concentration contrast medium for CTCA examination can obtain better image quality and reduce radiation dose.320 mg I/mL of contrast medium concentration can be used for CTCA.更多还原