Mitral annulus segmentation from 3D ultrasound using graph cuts.
Mitral annulus segmentation from 3D ultrasound using graph cuts.
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DOI：
10.1109/tmi.2010.2050595
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发表时间：
2010-09
影响因子：
10.6
通讯作者：
Howe RD
中科院分区：
文献类型：
--
作者：
Schneider RJ;Perrin DP;Vasilyev NV;Marx GR;del Nido PJ;Howe RD
二尖瓣环的形状用于诊断和建模应用中，然而精确且可再现地描绘环的方法是有限的。本文提出了一种二尖瓣环分割算法，该算法设计用于闭合的二尖瓣，仅使用瓣膜中心附近的单个用户指定点在三维超声中定位瓣环。该算法首先在薄瓣叶的位置处构建表面，然后通过找到薄瓣叶组织与较厚心脏壁相遇的位置来定位瓣环。该算法迭代，直到满足收敛度量，从而产生独立于操作者的二尖瓣环分割。通过将算法结果与一组专家对二尖瓣临床超声图像的描绘以及一名专家使用电磁跟踪指针对切除的猪心二尖瓣环手术视图的描绘进行比较，从诊断和手术角度评估了算法的准确性。在前一项研究中，该算法在统计学上无法与最佳执行专家（p = 0.85）区分，与专家平均值的平均RMS差异为1.81 ± 0.78 mm。在后者中，算法的瓣环与六个心脏上的电磁跟踪点之间的平均RMS差为1.19 ± 0.17 mm。
The shape of the mitral valve annulus is used in diagnostic and modeling applications, yet methods to accurately and reproducibly delineate the annulus are limited. This paper presents a mitral annulus segmentation algorithm designed for closed mitral valves which locates the annulus in three-dimensional ultrasound using only a single user-specified point near the center of the valve. The algorithm first constructs a surface at the location of the thin leaflets, and then locates the annulus by finding where the thin leaflet tissue meets the thicker heart wall. The algorithm iterates until convergence metrics are satisfied, resulting in an operator-independent mitral annulus segmentation. The accuracy of the algorithm was assessed from both a diagnostic and surgical standpoint by comparing the algorithm’s results to delineations made by a group of experts on clinical ultrasound images of the mitral valve, and to delineations made by an expert with a surgical view of the mitral annulus on excised porcine hearts using an electromagnetically tracked pointer. In the former study, the algorithm was statistically indistinguishable from the best performing expert (p = 0.85) and had an average RMS difference of 1.81 ± 0.78mm to the expert average. In the latter, the average RMS difference between the algorithm’s annulus and the electromagnetically tracked points across six hearts was 1.19 ± 0.17mm.