北京生物醫(yī)學(xué)工程

Chirp編碼激勵(lì)磁聲成像信號(hào)處理方法研究

Research on signal processing method of Chirp coded excitation for magneto-acoustic imaging

作者：張順起張鑫山馬任殷濤劉志朋

單位：中國醫(yī)學(xué)科學(xué)院生物醫(yī)學(xué)工程研究所（天津300192）

關(guān)鍵詞：磁聲成像; Chirp信號(hào); 編碼激勵(lì); 脈沖壓縮; 信噪比

分類號(hào)：R318.04

出版年·卷·期（頁碼）：2019·38·6（611-616）

摘要：

目的磁聲信號(hào)信噪比低限制了磁聲成像的圖像質(zhì)量，本研究提出Chirp脈沖編碼激勵(lì)的磁聲成像信號(hào)處理方法，以提高磁聲信號(hào)信噪比，縮短信號(hào)處理時(shí)間。方法本研究通過仿真計(jì)算和磁聲信號(hào)的實(shí)驗(yàn)測量，對不同脈沖寬度的Chirp信號(hào)編碼激勵(lì)的磁聲信號(hào)進(jìn)行了研究。結(jié)果對于體外實(shí)驗(yàn)豬肉與金屬絲模型，編碼激勵(lì)明顯提高磁聲信號(hào)信噪比，10 μs、50 μs、100 μs的Chirp激勵(lì)，磁聲信號(hào)信噪比相比于單脈沖激勵(lì)分別提高7.65倍、42倍和90.1倍。同時(shí)處理時(shí)間明顯縮短，100 μs的Chirp激勵(lì)下處理時(shí)間相比于單脈沖平均方法處理時(shí)間縮短為原來的1.2 %。結(jié)論本研究的脈沖編碼處理方法對于提高磁聲信號(hào)信噪比，改善成像質(zhì)量，提高整體成像效率，具有重要意義。

Objective The low signal-to-noise ratio (SNR) of magneto-acoustic signals limits the image quality of magneto-acoustic imaging. A Chirp coded excitation signal processing method for magneto-acoustic imaging is proposed in this paper. The SNR of magneto-acoustic signal is improved and the signal processing time is shortened by using this approach. Methods In this paper, Chirp coded excitation for magneto-acoustic signals under different pulse widths are studied by simulation and experimental measurement. Results The SNRs of magneto-acoustic signals are increased by 7.65 times, 42 times, and 90.1 times under 10μs, 50μs and 100μs Chirp excitation respectively, for the pork and wire sample. At the same time, the processing time is significantly shortened to 1.2% of the average method under the single pulse excitation. Conclusions The pulse coding method is of great significance to improve the SNR of magneto-acoustic signals, image quality and imaging efficiency.

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