低管电压扫描技术联合低浓度对比剂在肾动脉CTA中的研究应用  

Low dose scanning technology combined with low concentration contrast agent in the renal artery CTA: A preliminary study

作　　者：夏俊[1] 邓琦[1] 罗泽斌[1] 

机构地区：[1]广东医学院附属医院放射科,广东湛江524023

出　　处：《中国临床医学影像杂志》2014年第8期570-573,586,共5页Journal of China Clinic Medical Imaging

摘　　要：目的:探索低管电压与低浓度对比剂的"双低"扫描方案在不具备迭代算法的CT机上行肾动脉CT血管造影(Computed tomography angiography,CTA)中的可行性。方法:将136例腹部CTA受检者按管电压和对比剂浓度随机分为4组。利用原始图像及后处理重建图像测量计算肾动脉的客观指标及辐射剂量结果。以Sahani 5分法评价肾动脉及分支血管显示程度。统计对比剂不良反应发生率。结果:4组之间两两比较,图像血管强化CT值及对比噪声比(CNR)值有显著性差异(P<0.05);管电压不同时,100 kV较120 kV背景值升高、噪声增大(P<0.05);肾动脉血管信噪比(SNR)值仅C组与D组比较无显著差异(P=0.342);图像质量主观评分差异无统计学意义(P>0.05);管电压不同时,100 kV较120 kV辐射剂量降低了约39%(P<0.05);不良反应发生率270 mgI/mL对比剂组较350 mgI/mL对比剂组明显减低(P<0.05)。结论:使用低管电压、低浓度对比剂的扫描在不具备迭代算法的CT机上也可以获得满意的肾动脉CTA图像质量,同时降低了辐射剂量及对比剂不良反应发生率。Objective： To explore low tube voltage and the low density contrast agents of the ＂double low＂ scan program on the feasibility of renal artery CTA. Methods： The 136 cases of abdominal CT angiography subjects were randomly divided into four groups by tube voltage and the concentration of contrast agent. Using the original image and the reconstructed post- processing image to measure and calculate objective indicators of renal artery and radiation dose results. Evaluating renal ar- teries and branch vessels showed the degree with Sahani 5 stars. Statisticing contrast agent incidence of adverse reactions. Results： Vascular CT values and CNR values were significant differences between the four groups of two （P〈0.05）; The CT values of background would rise, but noise would increase, when 100 kV of tube voltage would be used （P〈0.05）; There were no significant difference between the SNR values of group C and group D （P=0.342） only; Four groups of subjective image quality score was no significant difference （P〉0.05）. The radiation dose decreased by about 39%, when 100 kV of tube voltage would be used （P〈0.05）; Incidence of adverse reactions of C group and D group （used 270 mgI/mL contrast agent） were lower than A group and B group（used 350 mgI/mL contrast agent）（P〈0.05）. Conclusions： Using a low tube voltage, a low concentra- tion of contrast agent scans can obtain satisfactory image quality renal artery CTA, reduce the radiation dose and the contrast agent adverse reactions.

关 键 词：肾动脉 体层摄影术 螺旋计算机 血管造影术 

分 类 号：R331.33[医药卫生—人体生理学] R814.43[医药卫生—基础医学]