北京生物醫(yī)學工程

超聲多普勒血流和管壁搏動信號的分離研究

Separation method of the Doppler ultrasound blood flow from vessel wall pulsation signals

作者：朱易順彭虎

單位：中國科學技術(shù)大學電子科學與技術(shù)系（合肥 230027）

分類號：

出版年·卷·期（頁碼）：2012·31·2（159-163）

摘要：

目的針對超聲多普勒血流檢測中，傳統(tǒng)的高通濾波法在濾除管壁搏動信號的同時也會濾除低頻血流信號的問題，本研究提出一種以心電信號(electrocardiography，ECG)作為參考信號的自適應濾波的方法消除管壁干擾。方法包括兩方面：其一，采用心電信號作為參考信號對超聲多普勒信號進行自適應濾波；其二，采用多級自適應濾波并選擇不同的參考信號的濾波方案。分別使用上述方法和高通濾波法對仿真的超聲多普勒信號進行處理，并將結(jié)果進行比較。結(jié)果與傳統(tǒng)的高通濾波法相比,該方法在有效抑制管壁搏動信號的同時保留一部分低頻血流信號成分。結(jié)論該方法能較準確地提取出完整的血流超聲多普勒信號，具有一定的臨床應用價值。

Objective In Doppler ultrasound blood flow detection，the traditional high-pass filter would eliminate the low-frequency blood flow signals when it eliminated the vessel wall pulsation signals，so we proposed a method of adaptive filtering which used electrocardiography(ECG)as reference signal to eliminate wall interference. Methods First we utilized the ECG as reference signal for the Doppler ultrasound signals in adaptive filter. Then we adopted the multi-level adaptive filters and selected different reference signals in the filtering programs. Finally we used both methods，the proposed method and high-pass filter，to treat the simulation signals of Doppler ultrasound，and compared the two results. Results The proposed method effectively restrained the wall pulsation signals，and kept a portion of the low blood flow signal components. Conclusions This method could extract the complete Doppler ultrasound blood flow signals accurately，which is valuable for clinical application.

參考文獻：

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