Research on laser Doppler blood flow signal’s treatment method based on wavelet transform

doi:10.3778/j.issn.1002-8331.2008.24.074

Computer Engineering and Applications ›› 2008, Vol. 44 ›› Issue (24): 246-248.DOI: 10.3778/j.issn.1002-8331.2008.24.074

• 工程与应用 • Previous Articles

Research on laser Doppler blood flow signal’s treatment method based on wavelet transform

WANG Huan¹,SHI Yi-kai¹,YAO Qin¹,YE Ya-lin^1,2

1.Northwestern Polytechnical University，Xi’an 710072，China
2.Xi’an Communication College，Xi’an 710106，China

Received:2007-11-13 Revised:2008-01-28 Online:2008-08-21 Published:2008-08-21
Contact: WANG Huan

基于小波变换的激光多普勒血流信号处理研究

王萑¹,史仪凯¹,姚钦¹,耶亚林^1,2

1.西北工业大学机电学院，西安 710072
2.西安通信学院，西安 710106

通讯作者: 王萑

Abstract

Abstract: The photoelectric signal picked-up by laser Doppler blood flow detecting system contains large white Gaussian noise.To remove this disturbance and pick-up laser Doppler signal，this paper has put forward a processing method based on wavelet transform，which contained five layer discrete wavelet decomposition，threshold transform，signal de-noising and signal reconstruction，using wavelet toolbox in Matlab.The result shows that this method can reduce the influence of noise effectively，pick-up the Doppler signal from original photoelectric signal and calculate the blood flow after analysis.The result of research has certain reference value in analyzing Doppler signal，detecting changes of blood flow in real time，explaining the pathologic meaning of blood flow，the further diagnosing and guiding the medical measurement.

Key words: blood flow, laser Doppler, wavelet transform, signal de-noise

摘要： 激光多普勒血流量检测系统提取的光电信号中存在较大的高斯白噪声，为了消除这些噪声干扰，提取激光多普勒信号，提出了一种基于小波变换，使用Matlab中的wavelet toolbox对所得信号进行五层离散小波分解、阈值变换、消噪以及信号重构的处理方法。结果表明，该方法可有效地抑制噪声，从原始光电信号图中提取多普勒信号并对其进行分析，计算血流速度。该研究结果对后续的分析多普勒血流信号，实时检测血流量变化情况，解释血流病理含义，进而对诊断病因、指导医疗手段均有一定的参考价值。

关键词: 血流量, 激光多普勒, 小波变换, 信号去噪

WANG Huan¹,SHI Yi-kai¹,YAO Qin¹,YE Ya-lin^1,2. Research on laser Doppler blood flow signal’s treatment method based on wavelet transform[J]. Computer Engineering and Applications, 2008, 44(24): 246-248.

王萑¹,史仪凯¹,姚钦¹,耶亚林^1,2. 基于小波变换的激光多普勒血流信号处理研究[J]. 计算机工程与应用, 2008, 44(24): 246-248.

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Research on laser Doppler blood flow signal’s treatment method based on wavelet transform

基于小波变换的激光多普勒血流信号处理研究

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