彩色多普勒图像心脏流场流线可视化方法

Visualization Method of Plane Streamlines in Cardiac Flow Field Based on Color Doppler Image Information

为了解决心脏流体运动状态的可视化描述问题,根据心脏流场超声图像的特点,提出一种基于彩色多普勒图像信息的心脏流体运动平面流线可视化描述方法.该方法采用点源和点汇表示二维观测区域的三维流动,通过拓展流函数计算原理实现多普勒流函数值的计算;以点源和点汇作为平面流线的起点和终点,根据同一流线上多普勒流函数值相等的原理绘制平面流线;选取平面流线中的封闭曲线获得心脏流场内涡流流线图.实验结果表明,文中方法能够对彩色多普勒图像中的流体运动状态进行有效的可视化描述,并能有效地描述心脏流体的涡流运动状态,为心脏流体运动状态的有效可视化观察和精确量化评价提供了一种新方法.

In order to solve the problem of precise visualization and description of cardiac fluid state, a new streamline visualization method of cardiac fluid motion based on color Doppler image information according to the characteristics of cardiac flow field is studied. This method represents three-dimensional flow in two-dimensional observation area with point sources and point sinks, and calculates Doppler flow function value by expanding the stream function principle. It regards point sources and point sinks as the start points and end points of plane streamline respectively, then draws plane streamline on the basis of the principle that Doppler-flow-function values are equal in the same streamline. According to the method, vortex streamlines of cardiac flow field can be obtained by selecting the closed curves from plane streamlines also. Experimental results show that the proposed method can effectively realize visual description of cardiac fluid state, and effectively describe vortex motion state in the two-dimensional observation plane, and provide a new method for the effective visualization and precise quantification of cardiac fluid state simultaneously.