REGION-BASED ENDOCARDIUM TRACKING ON REAL-TIME THREE-DIMENSIONAL ULTRASOUND
REGION-BASED ENDOCARDIUM TRACKING ON REAL-TIME THREE-DIMENSIONAL ULTRASOUND
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DOI：
10.1016/j.ultrasmedbio.2008.08.012
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发表时间：
2009-02-01
影响因子：
2.9
通讯作者：
Laine, Andrew F.
中科院分区：
文献类型：
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作者：
Duan, Qi;Angelini, Elsad D.;Laine, Andrew F.
用于实时三维超声的矩阵相控阵换能器可实现快速、非侵入性的心室可视化。通常，三维超声图像被半自动分割以提取舒张末和收缩末期的左室心内膜表面。在整个心脏周期中自动分割和传播这一表面是一项具有挑战性和繁琐的任务。如果心动周期中心内膜表面的位置是在一个或两个时间帧上提供的，那么在剩余的时间帧上自动跟踪心内膜表面可以减少心脏病医生的工作量并优化三维超声数据的分析。在本文中，我们应用了一种基于区域的跟踪算法来跟踪手动分割的两个参考帧之间的心内膜表面。为了评估心内膜的跟踪，该方法被应用于40个共484帧的开胸犬数据集。定量比较了基于区域心内膜表面和手工示踪得到的心室几何形状和体积，显示两种方法之间有很强的相关性。统计分析表明，跟踪误差在人工跟踪的观察者间变异范围内。此外，我们的算法在缺血数据集上表现良好，表明该方法对异常的室壁运动是稳健的。总之，提出的基于光流的心内膜表面跟踪方法是非常有效和准确的，提供了分段心内膜表面的动态“内插”。(电子邮件：qd2002@belbia.edu)(C)2009年世界医学和生物学超声联合会。
Matrix-phased array transducers for real-time 3-D ultrasound enable fast, noninvasive visualization of cardiac ventricles. Typically, 3-D ultrasound images are semiautomatically segmented to extract the left ventricular endocardial surface at end-diastole and end-systole. Automatic segmentation and propagation of this surface throughout the entire cardiac cycle is a challenging and cumbersome task. If the position of the endocardial surface is provided at one or two time frames during the cardiac cycle, automated tracking of the surface over the remaining time frames could reduce the workload of cardiologists and optimize analysis of 3-D ultrasound data. In this paper, we applied a region-based tracking algorithm to track the endocardial surface between two reference frames that were manually segmented. To evaluate the tracking of the endocardium, the method was applied to 40 open-chest dog datasets with 484 frames in total. Ventricular geometry and volumes derived from region-based endocardial surfaces and manual tracing were quantitatively compared, showing strong correlation between the two approaches. Statistical analysis showed that the errors from tracking were within the range of interobserver variability of manual tracing. Moreover, our algorithm performed well on ischemia datasets, suggesting that the method is robust-to-abnormal wall motion. In conclusion, the proposed optical flow-based surface tracking method is very efficient and accurate, providing dynamic "interpolation" of segmented endocardial surfaces. (E-maill: qd2002@columbia.edu) (c) 2009 World Federation for Ultrasound in Medicine & Biology.