文章摘要
汪源源,刘斌,仪艳华,王威琪.利用正交相位法提取双向性血流的一种补偿方法[J].声学技术,1997,(2):62~65
利用正交相位法提取双向性血流的一种补偿方法
A compensation method in quadrature phase detection of directional blood flow information
投稿时间:1996-10-16  
DOI:
中文关键词: 多普勒  正交相位  正交信号  补偿
英文关键词: Doppler  quadrature phase  quadrature signals  compensation
基金项目:
作者单位
汪源源 复旦大学电子工程系, 上海 200433 
刘斌 复旦大学电子工程系, 上海 200433 
仪艳华 复旦大学电子工程系, 上海 200433 
王威琪 复旦大学电子工程系, 上海 200433 
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中文摘要:
      正交相位法是超声多普勒技术中提取双向性血流信息的一种重要方法。由于正交信号对之间通常存在幅度和相位的不平衡,从而导致了正、反血流信息的混淆,影响了平均频率、最大频率的估计和声谱图的正确显示。本文提出的补偿方法,让其中一个正交信号通过按一定要求设计的线性滤波器,从而得到幅度和相位基本平衡的正交信号对,提高了超声多普勒系统提取双向性血流的性能。
英文摘要:
      Quadrature phase method is one of the important methods in directional blood flow information detection using Doppler ultrasound techniques. There exists the imbalance of amplitude and phase between the pair of quadrature signals, which leads to the crosstalk between the forward and reverse blood flow information. This effect may bring errors in mean frequency and maximum frequency estimation and sonogram displaying. Using the compensation method described in this paper, a pair of quadrature signals with balance between the amplitude and phase was obtained by letting the quadrature signal pass through a designed linear filter with certain characteristics, which may improve the performance of directional blood flow detection of Doppler ultrasound system.
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