摘要
目的:探讨低电压、低碘对比剂剂量(双低)头颈CTA的可行性。方法:30例患者行双低头颈CTA检查,对比剂剂量为0.3mL/kg,管电压100kVp。30例作为对照组行常规CTA检查,对比剂剂量为60mL,管电压120kVp。采用独立样本t检验比较两组的对比剂剂量、剂量长度乘积(DLP)、体型特异性剂量估计值(SSDE);采用Mann-Whitney U检验比较两组图像质量等级、头颈动脉各段的CT值等级。结果:双低组对比剂剂量均值为(28.13±2.76)mL,对照组为60mL,两组差异有统计学意义(P<0.05)。双低组SSDE均值为(24.29±0.98)mGy,对照组为(31.77±2.27)mGy,差异有统计学意义(P<0.05)。双低组DLP均值为(889.24±62.00)mGy.cm,对照组为(1185.04±140.05)mGy.cm,两组差异有统计学意义(P<0.05)。两组图像质量主观评分差异无统计学意义(P>0.05),头颈部血管CT值等级评分中大脑中动脉两组差异有统计学意义(P<0.05),其它血管两组差异无统计学意义(P>0.05)。结论:100kVp、低对比剂剂量头颈CTA检查所得图像能够满足诊断需求,同时降低了辐射剂量和对比剂用量。
Objective：To evaluate image quality and radiation dose of multidetector computed tomography （MDCT） for carotid CT angiography （CTA） with low kVp and low dose contrast media. Methods：Carotid CTA was performed in 30 patients （group A） with 100kVp and low dose contrast media （0.3mL/kgbw）. Carotid CTA was performed in another 30 patients （group B） with 120kVp and 60mL contrast media. Radiation exposure parameters （SSDE and DLP） were compared with independent samples t tests. Image quality was assessed and CT attenuation was measured. Results： Both the mean values of SSDE and DLP of group A were significantly lower than those of group B（24.29±0.98）mGy vs（31.77±2.27）mGy （t=-16.60,P〈0.01） ;（889.24±62.00）mGy.cm vs （1185.04±140.05）mGy.cm（t=-10.58,P〈0.01）. There was no significant difference between the overall image qualities of the two groups. Conclusion：Carotid CTA with 100kVp and low dose contrast media can provide satisfactory images with significant reduction of radiation exposure and iodine administration simultaneously.
出处
《放射学实践》
2013年第5期482-485,共4页
Radiologic Practice
