彩超系统中壁滤波器设计和性能比较

本文首先介绍了多普勒原理和血流多普勒信号模型,推出了壁滤波器设计在彩色超声成像系统中具有极其重要的地位;其次分析了如何通过无限脉冲冲激响应（IIR）滤波器和回归型滤波器设计壁滤波器的原理,其中无限脉冲冲激响应（IIR）滤波器根据初始状态的不同又可以分为零初始化、阶跃初始化和投影初始化三种滤波器;然后根据上述原理分别对各种形式的壁滤波器进行设计,得到它们的频谱图;最后根据频谱图,对这几种壁滤波器进行性能比较,得到它们的优缺点,对从事壁滤波器设计相关的工作者有一定得借鉴意义。

Design and Functional Comparison of Wall Filters in the Color Doppler System

In this article, the Doppler Principle and the model of Doppler signal are firstly introduced, from which we can recog- nize the importance of the wall filter design in the Color ultrasound imaging system. Secondly we analyzed the theories of how to design the wall filter by infinite impulse response （IIR） filter and the regression filter. According to the initial state of filter, the infinite impulse response （IIR） filter can be divided into zero-initialization, step-initialization and project-initialization. Finally we design them and get their advantages and disadvantages by comparing the spectnuns of all kinds of wall filters. This paper will provide the workers engaged in the wall filter design with some references.