北京航空航天大学学报 ›› 2014, Vol. 40 ›› Issue (12): 1761-1766.doi: 10.13700/j.bh.1001-5965.2013.0741

• 论文 • 上一篇    下一篇

SDUV方法中组织振动信号提取算法比较

蔡夕然, 樊璠, 李晓斐, 牛海军   

  1. 北京航空航天大学 生物与医学工程学院, 北京 100191
  • 收稿日期:2014-01-08 出版日期:2014-12-20 发布日期:2014-12-30
  • 通讯作者: 牛海军 E-mail:hjniu@buaa.edu.cn
  • 作者简介:蔡夕然(1989-),男,江西鹰潭人,硕士生,colepfieffer08@gmail.com
  • 基金资助:

    国家自然科学基金资助项目(31170896)

Comparison of tissue vibration signal extraction algorithms in shearwave dispersion ultrasound vibrometry

Cai Xiran, Fan Fan, Li Xiaofei, Niu Haijun   

  1. School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-01-08 Online:2014-12-20 Published:2014-12-30

摘要:

组织振动信号的提取是剪切波频散超声振动成像技术(SDUV)方法中的重要步骤.目前,SDUV方法中有两种常用的组织振动信号提取算法,正交解调法(QDM)和互功率谱法(CSM),但是未见比较这两种算法提取质量差异的相关研究.因此,构造了不同信噪比(SNRU)的参数化仿真超声回波信号模型,分别使用QDM和CSM从超声回波信号中提取组织振动信号,比较了两种方法的提取效果与计算效率.实验结果表明,当SNRU≥35 dB,两种算法在相同信噪比下提取出的信号所分离出的振动相位结果相近,标准差均小于1°,对于剪切波波速的计算结果没有太大影响.CSM的计算效率低于QDM的计算效率.因此,当SNRU<35 dB,为了减小振动信号初始相位的提取误差,应该使用CSM提取组织的振动信号.当SNRU≥35 dB,应该选择QDM提取组织的振动信号,以减少信号处理时间.本研究的发现有助于提高SDUV方法的检测效率.

关键词: SDUV, 信噪比, 振动信号提取, 正交解调法, 互功率谱法

Abstract:

Vibration extraction is an important step in shearwave dispersion ultrasound vibrometry (SDUV). There are two primary algorithms for vibration extraction in SDUV, the quadrature demodulation method (QDM) and the cross-spectrum method (CSM). However, the extraction qualities of QDM and CSM are under appropriate comparison. This study aimed at comparing the performance of QDM and CSM for tissue vibration extraction based on a parameterized model under various signal-to-noise ratio of ultrasound echoes (SNRU). Results show that when SNRU≥35 dB, the standard deviations of the estimated vibration phase using the vibration extracted by the two methods are close, which has no significant influence on the calculation result of the shear wave speed. The computation efficiency of CSM for vibration extraction is lower than that of QDM. As a conclusion, when SNRU<35 dB, the tissue vibration should be extracted by CSM to suppress the error of vibration phase estimation. However, when SNRU≥35 dB, the tissue vibration should be extracted by QDM to reduce the signal processing time. The findings may provide some strategy in SDUV, which can optimize the examination protocol and make it more efficient.

Key words: SDUV, signal-to-noise ratio (SNR), vibration extraction, quadrature demodulation method (QDM), cross-spectrum method (CSM)

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