Fast tracking of cardiac motion using 3D-HARP.
Fast tracking of cardiac motion using 3D-HARP.
复制标题
使用 3D-HARP 快速跟踪心脏运动。
DOI：
10.1007/978-3-540-45087-0_51
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Osman,NaelF
中科院分区：
文献类型：
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作者：
Pan,Li;Lima,JoaoAC;Osman,NaelF
MR标记被认为是一种有价值的无创定量评价局部心肌功能的技术，但心脏运动跟踪的后处理过程繁琐且耗时，仍阻碍了其在常规临床检查中的应用。提出了一种从短轴(SA)和长轴(LA)标记的MRI图像中快速半自动跟踪3D心脏运动的方法。这项技术被称为3D-HARP(谐波相位)，它是基于HARP方法的，并将该方法扩展到跟踪3D运动。构建材质网格模型以表示左心室(LV)壁内的材质点的集合。利用物质点的相位时不变性对网格点进行跟踪。对于一系列9个时间帧的MRI图像，初始化设置、构建网格和跟踪3D心脏运动所需的总时间约为10分钟。进一步的朗格朗日应变和扭转角分析表明，在收缩过程中，左室壁外侧壁的应变值大于室间隔，从底部到心尖部的SA切片显示出逐渐变化的扭转模式。
MR tagging is considered as a valuable technique to evaluate regional myocardial function quantitatively and noninvasively, however the cumbersome and time-consuming post-processing procedures for cardiac motion tracking still hinder its application to routine clinical examination. We present a fast and semiautomatic method for tracking 3D cardiac motion from short-axis (SA) and long-axis (LA) tagged MRI images. The technique, called 3D-HARP (HARmonic Phase), is based on the HARP method and extends this method to track 3D motion. A material mesh model is built to represent a collection of material points inside the left ventricle (LV) wall. The phase time-invariance property of material points is used to track the mesh points. For a series of 9 timeframe MRI images, the total time required for initializing settings, building the mesh, and tracking 3D cardiac motion is approximately 10 minutes. Further analysis of Langrangian strain and twist angle demonstrates that during systole, the lateral LV wall shows a greater strain values than the septum and the SA slices from the base to the apex show a gradual change in twist pattern.