低管电压联合低浓度对比剂在头部CTA中的可行性研究

目的探讨用低管电压联合低浓度对比剂在头部CTA中的可行性。方法收集60例行头部CTA检查的患者,根据不同的管电压和对比剂浓度随机分为双低组和传统组。双低组采用管电压100 kV,噪声指数(NI)为10,对比剂为碘海醇(300 mgI/ml);传统组采用管电压120 kV,NI为10,对比剂为碘帕醇(370 mg I/ml)。两组均采用对比剂40 ml,注射流率4.5 ml/s,使用64层螺旋CT进行扫描。比较两组CT图像质量(包括动脉强化CT值、图像评分)及辐射剂量。使用SPSS13.0统计分析软件分别对所得的各组数据进行分析,P0.05时认为差异有统计学意义。结果两组图像质量均能满足临床诊断要求,两组CT图像质量比较差异无统计学意义。双低组有效剂量(ED)较传统组降低15.21%,两组辐射剂量比较差异有统计学意义(P=0.021)。结论低电压联合低浓度对比剂在头部CTA检查所得图像质量能满足临床诊断需求,同时降低了辐射剂量。

Feasibility of combining low tube voltage with low-concentration contrast in cerebral CTA

Objective To investigate the feasibility of combining low tube voltage with low-concentration contrast in cerebral CTA.Methods 60 patients who underwent cerebral CTA were randomly divided into two groups using the conventional method of 120 kV tube voltage and 370 mg I/mL of iopamidol or low-dose method of 100 kV tube voltage and 300 mg I/mL of iopamidol.The CTA was performed on all patients using a 64-detector-row spiral CT scanner after intravenous injection of 40 mL of contrast at the rate of 4.5 mL/s.The image quality and radiation dosage of the two methods were compared.Results All images were satisfactory without significant difference in image quality between the two groups.The effective dose of the low-dose method was significantly lower by15.21%than that of the conventional method.Conclusion Cerebral CTA using low tube voltage and low-concentration contrast is satisfactory for clinical evaluation at reduced radiation exposure.