iPass技术在CE-MRA中的应用  

Evaluation of the Use of iPass Bolus Tracking Sequence in Contrast Enhanced MR Angiography

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

机构地区：[1]湖北省肿瘤医院放射科,武汉430079

出　　处：《临床放射学杂志》2004年第8期718-721,共4页Journal of Clinical Radiology

摘　　要：目的　探讨iPass技术在增强MR血管成像 (CE MRA)的临床应用价值。资料与方法　 18例行CE MRA患者 ,男 12例 ,女 6例。其中腹部血管成像 15例 ,颈部血管成像 2例 ,股动脉成像 1例。CE MRA前 ,注射 2ml对比剂行iPass测试。扫描层面位于CE MRA冠状视野的远心端 1/ 3处 ,饱和板置于测试平面的近心端 ,iPass扫描1帧 /s,实时图像显示 ,同步绘制血管内信号强度 时间曲线 ,自动将曲线上升段超出基线 30 %的时间记为对比剂到达时间 ,自动将到达时间载入CE MRA序列 ,根据到达时间决定扫描延迟时间进行CE MRA扫描。原始图像减影后行最大信号强度投影 (MIP)重建 ,评价重建血管图像质量。结果　 17例一次顺利完成iPass测试和CE MRA ,1例首次未能测出峰值曲线 ,调整感兴趣区 (ROI)后 ,再行注射后测试成功 ,完成CE MRA。MIP血管图像质量评分 3.72±0 .5 7。结论　iPass测试可以提供较准确的对比剂到达时间 ,可以自动控制CE MRA的扫描延迟时间 ,有利于提高CEObjective To evaluate iPass bolus tracking sequence in performing contrast enhanced MR angiography (CE-MRA).Materials and Methods CE-MRA was performed in 18 cases (12 males and 6 females), including abdominal (n=15), cervical (n=2) and femoral (n=1) angiography. Before CE-MRA, a test of iPass bolus tracking was made with the injection of 2ml contrast agent. The test slice was located at the distal 1/3 of FOV. The presaturation pulse plane was set at the proximal end of the test slice. The iPass scan was done at 1 frame/s with real time display, and intra-vasscular signal intensity-time curve was synchronously drawn. The system took the time when the rising curve was 30% over the baseline as the arrival time of the contrast, and this time was automatically loaded into CE-MRA sequence, based on which the delay time for CE-MRA was determined. The images thus obtained were subtracted, and MIP reconstruction was done.Results The iPass bolus tracking sequence and CE-MRA were completed successfully in 17 cases. In the remaining one case, peak value curve could not be estimated in the initial test, but the test with the subsequent CE-MRA was succeeded after adjusting ROI. The quality score of MIP was 3.72±0.57.Conclusion The iPass bolus tracking sequence can precisely estimate the contrast arrival time, automatically control the scan delay time in performing CE-MRA, thus, improve the image quality.

关 键 词：iPass技术 CE-MRA 图像质量 临床应用 颈部血管成像 腹部血管成像 

分 类 号：R445.2[医药卫生—影像医学与核医学]