| 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) |
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