摘要
利用改进的左心室数字模拟器提供的加标记的核磁共振图像(MRI),文章研究左心室位移场的运动重建方法。先以双三次B样条曲面技术拟合短轴和长轴影像层三个方向的标记面,然后采用最小二乘原理确定短轴和长轴影像层标记点1D逆向位移场的最优控制顶点,在此基础上拟合的短轴影像层上标记点的3D逆向位移场达到亚像素精度。这对于跟踪心肌点几何位置,分析左心室的运动变形具有重要意义。
This paper gives a method to describe the heart motion on the tagged MRI images from a left ventricle digital simulator.First,using a tensor product of bicubic B-splines.It represents tag planes in two orthogonal orientations intersecting the short -axis image slices and tag planes in an orientation oryhogonal to the short -axis tag planes intersecting long-axis image slices.Then the optimum control points describing the1D inverse displacement are obtained by a least square minimization.At last the proposed3D inverse displacement field of tagged pionts within short-axis image slices exhibited sub-pixel accuracy.This method is efficient so that the3D motion of tagged points can be measured and the the motion deformation of Left Ventricle(LV)can be tracked.
出处
《计算机工程与应用》
CSCD
北大核心
2004年第33期28-30,82,共4页
Computer Engineering and Applications
基金
香港特区政府研究资助局资助项目(编号:CUHK/4180/01E)
