中文摘要：

二尖瓣环的非平面特性对二尖瓣返流的超声诊断和二尖瓣环成形术的合理设计具有重要意义。基于心脏的实时三维超声图像，我们研究了一种对二尖瓣环三维重建及运动分析的方法。首先通过人机交互方式提取出二尖瓣环的特征点，并根据位置关系对特征点排序，然后利用非均匀有理B样条曲线建立二尖瓣环三维形态模型，并编程实现二尖瓣环的动态显示和运动分析。通过对20组病例分析，初步证明此方法所建模型较准确反映患者的二尖瓣环的运动，能满足二尖瓣环三维可视化和分析研究的需要。

英文摘要：

Non-planar saddle-shaped structure of mitral annulus is of significance to the diagnosis of mitral regurgitation. Based on real-time three-dimensional echocardiography images, a reconstruction and dynamic analysis method of mitral annulus was proposed in this paper. First, the boundary points of the mitral annulus are extracted by interactive method and are arranged according to their positions. Then, based on non-uniform rational b-splines model, the three-dimensional mitral annulus visualization model is established and the dynamic analysis method is developed and programmed. Results show that the reconstruction and analysis method proposed in this paper can quickly, efficiently and robustly get the motion of mitral annulus.