3D MERGE序列在膝关节准动态运动轨迹模拟中的应用  

Application of 3D MERGE Sequence for Quasi Dynamic Knee Trajectory Simulation

作　　者：赵殿江[1] 张璇[1] 张春柱[1] 崔媛[1] 姚杰[2] 辛星[3] 杨滨[3] 张克[3] ZHAO Dianjiang ZHANG Xuan ZHANG Chunzhu et al(Department of Radiology ,Peking University International Hospital, Beijing 102206 ,P. R. China)

机构地区：[1]北京大学国际医院放射科,102206 [2]北京航空航天大学生物医学工程学院,100191 [3]北京大学国际医院关节外科,102206

出　　处：《临床放射学杂志》2017年第2期260-263,共4页Journal of Clinical Radiology

基　　金：国家自然科学基金项目(编号:11302248);国际自然科学基金项目(编号:11502014);北京大学国际医院院内基金资助项目(编号:YN2016QH08)

摘　　要：目的采用三维多回波恢复梯度回波(3D multiple-echo recalled gradient echo,3D MERGE)序列进行膝关节多角度扫描,对磁共振图像进行后处理,以期获得膝关节从过伸位到最大屈膝位活动过程的三维重建及运动轨迹。方法 12例受试者,男5例,女7例,年龄17~39岁,平均(29.9±0.74)岁。磁共振扫描仪为GE 3.0T Discovery MR 750,使用8通道US TORSOPA线圈,扫描序列为3D MERGE序列。受试者取侧卧位,受试侧下肢在下。膝关节进行5个角度(过伸位、屈膝30°位、屈膝60°位、屈膝90°位、最大屈膝角度位)采集磁共振图像。将扫描后的膝关节磁共振图像导入软件进行分割、三维重建及注册后,模拟屈伸膝过程中的运动轨迹。结果采用3D MERGE序列,获得了完整的膝关节磁共振图像,重建了各屈膝角度的膝关节三维重建模型,进而模拟出了膝关节准动态三维运动轨迹。结论 3D MERGE序列扫描获取的膝关节磁共振图像,能够满足膝关节重建三维模型及模拟准动态运动轨迹的要求。Objective To study value of MRI 3D MERGE for quasi dynamic 3D knee trajectories simulations. Methods Twelve healthy volunteers（ seven females,five males,mean age 29. 9 ± 0. 74years） were involved. 3D MERGE sequence was used in five intervallic knee flexion angles-hyperextension on Sagittal GE 3. 0T Discovery MR750 with an 8-channel US TORSOPA. After bone and cartilage segmentation,3D-reconstruction and 3D-registration,quasi-dynamic 3D knee trajectories were simulated with spline interpolation algorithm. Results All knee MRIs were acquired with this technique,12 quasi dynamic 3D knee trajectories were simulated. Conclusion 3D MERGE sequence can be used on MRI scan of knee flexion angles,which can meet demand for quasi dynamic 3D knee trajectories simulation.

关 键 词：磁共振成像 膝关节 多回波恢复梯度成像 运动轨迹 

分 类 号：R445.2[医药卫生—影像医学与核医学] R684[医药卫生—诊断学]