文章摘要
韩晓丽,吴文焘,曹政.一种用于超声成像的零相位滤波后处理方法*[J].,2019,38(2):159-165
一种用于超声成像的零相位滤波后处理方法*
A zero-phase filtering post-processing method for ultrasonic imaging
投稿时间:2018-08-01  修订日期:2019-02-12
中文摘要:
      针对超声成像中基于有限脉冲响应滤波器(finite impulse response, FIR)的零相位滤波处理效率低难以满足实时性要求高的系统需求的问题,提出采用无限冲激响应滤波器(infinite impulse response, IIR)实现零相位滤波后处理的方法。首先,分别设计幅频特性相似的FIR和IIR滤波器作为零相位滤波器的基础滤波器;然后,针对超声相控阵系统采集的超声波回波射频信号,采用两种不同的零相位滤波方法进行处理,对比分析二者的性能、成像效果和效率。结果表明,实现幅频特性近似的零相位滤波,IIR滤波器具有更低的阶数,可以达到前者的1/4,算法的运算量更低,仅约为前者的1/2。当IIR滤波器采用直接形式实现时,效率更高,系统的实时性更好。
英文摘要:
      Zero-phase filtering processing based on finite impulse response (FIR) filter is inefficient and is difficult to meet the high real-time demand in ultrasonic system. We use infinite impulse response filter (IIR) based zero-phase filtering as an alternative. First of all, the FIR and IIR filter with similar amplitude-frequency response characterized by the same parameters are designed respectively. Then, analysis of the performance, imaging effectiveness and efficiency of both zero-phase filtering methods are made after the two different kinds of zero-phase filtering methods are applied to ultrasonic RF echoes collected by ultrasonic phased array system. The results show that zero-phase filtering based on IIR is less computationally intensive than that of FIR-based case even when amplitude-frequency characteristics of these two cases are almost the same. More specifically, the ratio of filter orders is about 1/4 and the ratio of the amount of computation is about 1/2. When IIR filter is realized in direct form (I), IIR based zero-phase filtering is more efficient, and can better meet the requirements of real-time ultrasonic system.
DOI:10.11684/j.issn.1000-310X.2019.02.002
中文关键词: 超声成像,超声相控阵,零相位滤波, IIR,效率
英文关键词: Ultrasonic imaging, Ultrasonic phased array , zero-phase filtering, IIR, efficiency
基金项目:国家自然科学基金项目 (61601454), 中国科学院声学研究所青年英才基金项目 (QNYC201732), 中国科学院声学研究所青年英才基金 项目 (QNYC201617)
作者单位E-mail
韩晓丽 中国科学院声学研究所 hxlhan123@163.com 
吴文焘 中国科学院声学研究所 wuwentao@mail.ioa.ac.cn 
曹政 中国科学院声学研究所 bnuxiaogui@qq.com 
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