Objective:To explore the clinical application and effect of prospective ECC-gated dual-source computed tomography coronary angiography (CTCA) with low tube voltage of 100 kV and low-iodine-concentration contrast agent to reduce radiation dosage.Methods:Totally 32 patients with coronary heart disease received dual-source computed tomography coronary angiography in the studyCTCA.Prospective ECC-gated technique with the tube voltage of 100 kV and 300 mgI/mL iodine contrast agent was used.CT value of main segments of coronary arteries was measured.The scores of image quality and radiation dosage were assessed and analyzed.Results:CT value of every studied segment of coronary arteries was over 300 HU.The score of image quality was five in 289 segments, four in 148 segments, as well as three in 34 segments.The mean CT dose index volume (CTDIvol) and effective dose (DE) were 10.48±1.90 and (1.64±0.26) mGy.Conclusions:Prospective ECG-gated dual-source CCTA with low tube voltage of 100 kV and low-iodine-concentration contrast agent can reduce the radiation dosage without reducing image quality.%目的:探讨在双源CT前门控冠状动脉CTA检查中应用100 kV低管电压结合低碘浓度对比剂降低辐射剂量的效果.方法:32例冠心病患者进行双源CT冠状动脉CTA检查,采用100 kV管电压,碘对比剂(300 mgI/mL),前门控轴扫.测量各冠状动脉主要节段的CT值,对图像质量进行评分,并分析辐射剂量变化.结果:所测得的各主干CT值均在300 HU以上.CTA图像质量均评分为5分者289个,4分148个,3分34个;平均容积CT剂量指数(CT dose index volume,CTDIvol)为10.48±1.90,有效剂量(effective dose, DE)为(1.64±0.26) mGy.结论:在双源前门控冠状动脉CTA检查中,采用100 kV低管电压结合低碘浓度对比剂能在保证图像质量的基础上降低辐射剂量.
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