多层面螺旋CT肝动脉血管成像参数的研究及肝移植术后肝动脉评价  

The Study of Scan Parameters on MSCT CTA and Evaluation of Hepatic Artery After Liver-transplantation

作　　者：沈文[1] 尹建忠[1] 陈光[1] 王鹏辉[1] 祁吉[1] 

机构地区：[1]天津医科大学第一中心医院放射科,天津300192

出　　处：《实用放射学杂志》2003年第10期910-913,共4页Journal of Practical Radiology

摘　　要：目的　系统分析主要扫描参数对CT血管成像图像质量的影响 ,寻找可获得较好图像质量的扫描参数组合 ,并对肝移植术后肝动脉进行评价。方法　应用不同扫描参数分别对随机选取的 45例腹部增强扫描病人进行扫描 ,高压注射器经肘静脉注入非离子型对比剂欧乃派克 1.3ml/kg体重 ,3ml/s注入速度 ,延时时间 18～ 2 0s,扫描完成后于GEAdvantageWindows 4.0工作站上进行 2D及 3D血管成像。通过观察管壁清晰度、伪影及肝动脉分支情况评价肝动脉CTA图像质量 ,系统分析主要扫描方式对肝动脉CTA图像质量的影响 ,寻找可获得良好图像质量的扫描参数组合。利用此扫描参数组合对 48例肝移植术后病人进行检查 ,并与DSA检查相对照。结果　①采用探测器组合 3 .75mm× 4+ 11.2 5mm床速的组合方式 ,HQ扫描模式 ,重叠重建率 70 %及STD重建方式进行扫描和重建可获得表面光滑、伪影不明显、形态不失真的肝动脉CTA图像。②采用此扫描参数组合评价 48例肝移植病人术后肝动脉CTA与DSA具有相同的准确性。结论　多层面螺旋CT血管成像可清楚显示正常肝动脉的情况 ,可达肝动脉 3级分支血管 。Objective To analyze the influence of different scan parameters of CTA and to explore the optimal scan parameters.Methods 45 patients were performed on contrast multidetector CT scan using different parameters with high-injector , nonionizing contrast1.3 ml/kg,3 ml/s and delay time 18～20 s. After scanning, postprocessing of 2D and 3D angiography were done on workstation GE Advantage Windows 4.0. We mainly detect the clearly artifact of vascular and tribute of hepatic artery to evaluate image quality of hepatic artery of CTA. Through analyzing the effect the major scanning parameters to image quality of CTA, we explored the optimal scanning parameters of good quality. 48 patients after liver transplantation were performed CT and conventional angiography within a week.Results The optimal scanning parameters: 3.75 mm×4/11.25 mm,HQ mode, overlapping reconstruction rate 70% and STD reconstruction method. We can acquire high quality of hepatic artery using above parameters.Conclusion MSCT angiography can clearly show normal hepatic artery and its three-grade tributes. MSCT angiography has advantage for evaluating of hepatic artery after liver transplantation.

关 键 词：多层面螺旋CT 肝动脉血管成像 参数 肝移植术 肝动脉 图像质量 

分 类 号：R657.3[医药卫生—外科学] R814.42[医药卫生—临床医学]