Flash双源CT脑血管成像双能量减影去骨比率值的优化研究  

Optimization of bone removal ratio for dual-energy cerebral subtraction angiography with Flash dual-source CT

作　　者：王建明[1] 毛俊[1] 陈海东[1] 肖万宏[1] 陈敏[1] 张格英[1] 

机构地区：[1]暨南大学附属珠海医院珠海市人民医院放射科,广东珠海519000

出　　处：《实用放射学杂志》2017年第8期1248-1251,共4页Journal of Practical Radiology

基　　金：珠海市科技计划项目（PC20071066）.

摘　　要：目的 探讨双能量减影去骨比率值的调节在脑血管成像中的临床应用价值.方法 回顾分析45例双源CT二期双能量脑血管检查患者资料.双能量法按不同去骨比率（Ratio）值分别分成A组（Ratio=1.6）,B组（Ratio=1.7）,C组（Ratio=1.8）,D组（Ratio=1.9,默认值）;100 kV Neuro-DSA减影法定为E组.采用双盲法按去骨程度及血管完整程度对图像质量评分（1-5分,1分为差,5分为优,3-5分为满意）.通过自身对比分析不同双能量去骨Ratio值对减影图像质量的影响,并以Neuro-DSA减影为对照,比较各组图像信噪比（SNR）、对比噪声比（CNR）及图像质量评分的统计学差异.结果 双能量减影不同去骨Ratio值组的颅底动脉图像评分总体满意率分别为：A组73.33%,B组91.11%,C组78.52%,D组70.37%.Ratio值取1.7时,虹吸段及岩骨段动脉的评分达满意显示率最高,差异有统计学意义（P〈0.05）.B组、D组、E组3组间SNR与CNR的差异不显著（P〉0.05）.结论 双源CT单次增强双能量减影去骨Ratio值的调节优化后的图像质量与100 kV Neuro-DSA减影一致性较好,可弥补双能量减影颅底脑血管缺损的不足,推荐在临床急诊脑血管检查中应用.Objective To evaluate the clinical application of regulating bone removal ratio in dual-energy cerebral subtraction angiography.Methods A total of 45 patients who underwent two phases dual-energy CT angiography （CTA） were recruited and divided into several groups by the value of bone removal ratio,as follows： group A （Ratio=1.6）, group B （Ratio=1.7）, group C （Ratio=1.8） and group D （Ratio=1.9,default）, as well as group E （100kV Neuro-DSA）.The image quality of dual-energy CTA was evaluated by double blind method according to bone suppression and integrity of the vessel lumen （1-5 points, 1=poor, 5=excellent, 3-5=satisfactory）.The bone removal ratio dependence of the image quality was analyzed using the self-control method.Moreover,the signal-to-noise ratio （SNR）,contrast-to-noise ratio （CNR） and image scores were compared with the Neuro-DSA subtraction among these groups.Results The overall satisfaction of basis cranii images that were executed by dual-energy CTA with different bone removal ratios was listed as below： group A 73.33%, group B 91.11%, group C 78.52%, group D 70.37%.The satisfaction of siphon segment and petrous segment reached the maximum when the value of ratio was 1.7,and with significantly difference （P〈0.05）.The SNR and CNR were not significantly different among group B, group D, and group E （P〉0.05）.Conclusion With optimal bone removal ratio,the single enhanced dual-energy subtraction image quality with flash dual-source CT is consistent well with that of conventional 100 kV Neuro-DSA subtraction.Thus,this method is recommended in clinical emergency cerebrovascular examination for the improved image quality,which can compensate the shortage of vascular defect in basis cranill.

关 键 词：计算机体层成像 脑血管成像 去骨 比率 

分 类 号：R814.42[医药卫生—影像医学与核医学] R743[医药卫生—放射医学]