三维增强MR血管成像个性化方案的确定:iPass技术的临床应用  

Designe of specific scanning scheme for 3D-CE-MRA by applying iPass

作　　者：张照喜[1] 陈宪[1] 徐宁[1] 刘玉林[1] 郑之青[1] 蒋春林[1] 

机构地区：[1]湖北省肿瘤医院放射科,武汉430079

出　　处：《中华放射学杂志》2005年第9期983-986,共4页Chinese Journal of Radiology

基　　金：湖北省卫生厅科研计划项目(WJ01585)

摘　　要：目的探讨iPass技术在三维增强磁共振血管成像(three dimensional contrast enhancedMR angiography,3D-CE-MRA)中的应用价值。方法32例行3D-CE-MRA患者,男19例,女13例,其中颈部血管成像4例,肺血管成像7例,腹部血管成像18例,下肢血管成像3例。3D-CE-MRA前,注射2ml钆喷替酸葡甲胺行iPass团注测试,实时显示感兴趣区(ROI)内血流信号强度-时间曲线,系统将曲线上升段超出基线30%的时间确定为对比剂峰值到达时间(Tp),同时自动将Tp导入相关联的3D-CE-MRA序列计算扫描延迟时间(Td),并启动扫描。分离各组图像并减影,然后行最大信号强度(MIP)投影。评价MIP后血管图像质量。结果29例1次顺利完成iPass团注测试和3D-CE-MRA,3例未能测出峰值曲线,经调整ROI面积后,成功完成。32例MIP血管图像质量平均得(3.81±0.59)分。结论iPass技术可准确测试Tp,并能自动控制相关联的3D-CE-MRA序列Td,有利于提高3D-CE-MRA成像质量,为3D-CE-MRA个性化方案的确定提供了可能。Objective To investigate the clinical value of iPass in three dimensional contrast enhanced MR angiography （3D-CE-MRA）. Methods iPass were performed in 32 cases, including cervical vessel （4 cases）, pulmonary vessel （7 cases）, abdominal vessel （18 cases）, and femoral vessel （3 cases）, iPass bolus tracking was run before 3D-CE-MRA. The tracking sequence was operated repeatedly with real time display of image. The peak of bolus arrival time （Tp）, identified with signal of target vessel increased 30% over baseline, was automatically loaded in the timing page of 3D-CE-MRA, and the time of scan delay（Td） was computed by the system with Tp. The acquired images were subtracted and reconstructed by MIP. The quality of MIP image was evaluated. Results The iPass bolus tracking sequence and 3D-CE-MRA were completed successfully in 29 cases. The bolus tracking couldn＇t detect the bolus arrival time in 3 cases, but they were completed through changing ROI and bolus tracking repeatedly. The average score of 3D-CE-MRA MIP image was 3.81 ±0. 59. Conclusion iPass can provide the exact Tp and automatically control Td of 3D-CE-MRA. iPass is a useful procedure to improve the image quality and provide the specific scanning scheme for 3D-CE-MRA.

关 键 词：磁共振血管造影术 注射 动脉内 研究技术 方案评价 三维增强MR血管成像 个性化方案 临床应用 强度-时间曲线 三维增强磁共振血管成像 扫描延迟时间 

分 类 号：R445.2[医药卫生—影像医学与核医学]