編碼激勵(lì)磁聲信號(hào)處理方法研究
本文關(guān)鍵詞: 磁聲耦合效應(yīng) 編碼激勵(lì) 巴克碼 格雷碼 信噪比 出處:《生物醫(yī)學(xué)工程學(xué)雜志》2017年05期 論文類型:期刊論文
【摘要】:基于磁聲耦合效應(yīng)的生物組織電特性檢測(cè)成像方法,在神經(jīng)電活動(dòng)監(jiān)測(cè)和腫瘤等疾病早期診斷方面具有重要研究意義。常用的單脈沖激勵(lì)和接收模式的信噪比低,限制了磁聲成像質(zhì)量;信號(hào)平均處理方法則限制了成像速率。本研究提出了一種脈沖編碼激勵(lì)的磁聲成像信號(hào)處理方法,采用編碼序列激勵(lì)模式和脈沖壓縮的檢測(cè)處理方法以提高信噪比,縮短信號(hào)處理時(shí)間。本研究通過仿真計(jì)算和磁聲信號(hào)的實(shí)驗(yàn)測(cè)量,采用13位巴克(Barker)編碼和16位格雷(Golay)編碼,對(duì)磁聲信號(hào)的編碼激勵(lì)和脈沖壓縮處理方法進(jìn)行了研究。結(jié)果表明,對(duì)金屬絲模型,在未進(jìn)行波形疊加平均的條件下,編碼激勵(lì)可明顯提高磁聲信號(hào)信噪比,如13位Barker脈沖編碼和16位Golay編碼處理方法,可分別提高磁聲信號(hào)信噪比約20.96 dB和20.62 dB。同時(shí)處理時(shí)間明顯縮短:在相同信噪比提升的情況下,13位Barker編碼和16位Golay編碼處理方法的整體采集處理時(shí)間約縮短為單脈沖激勵(lì)平均處理方法的3.62%和4.73%。本研究提出的脈沖編碼處理方法,對(duì)提高磁聲信號(hào)信噪比、改善成像質(zhì)量、提高整體成像速率具有重要意義。
[Abstract]:An imaging method for detecting electrical characteristics of biological tissue based on magnetoacoustic coupling effect. It is of great significance in the early diagnosis of diseases such as neuroelectric activity monitoring and tumor. The low signal-to-noise ratio (SNR) of single pulse excitation and receiving mode limits the quality of magnetoacoustic imaging. The average signal processing method limits the imaging rate. In this paper, a pulse coded magnetoacoustic imaging signal processing method is proposed. In order to improve signal-to-noise ratio (SNR) and shorten signal processing time, the method of coding sequence excitation mode and pulse compression is adopted in this paper. Simulation calculation and experimental measurement of magnetoacoustic signal are carried out in this paper. The excitation and pulse compression methods for magnetoacoustic signals are studied by using 13-bit Barker coding and 16-bit Gray Golay-coding. The results show that the wire model is applied to the magnetoacoustic signals. The signal to noise ratio of magnetoacoustic signals can be improved obviously without waveform superposition averaging, such as 13-bit Barker pulse coding and 16-bit Golay coding. The signal-to-noise ratio of magnetoacoustic signals can be increased by 20.96 dB and 20.62 dB, respectively. The whole acquisition processing time of 13-bit Barker coding and 16-bit Golay coding method is reduced to 3.62% and 4.73 of the average single-pulse excitation processing method. The pulse proposed in this study. Punching coding processing method. It is of great significance to improve the signal-to-noise ratio (SNR) of magnetoacoustic signal, improve the imaging quality and improve the overall imaging rate.
【作者單位】: 中國(guó)醫(yī)學(xué)科學(xué)院北京協(xié)和醫(yī)學(xué)院生物醫(yī)學(xué)工程研究所;
【基金】:國(guó)家自然科學(xué)基金青年科學(xué)基金資助項(xiàng)目(61501523) 醫(yī)學(xué)與健康科技創(chuàng)新工程資助項(xiàng)目(2016-I2M-1-004)
【分類號(hào)】:R318;TN911.7
【正文快照】: 引言生物組織電特性,可反映生物組織的生理病理特征[1-3],生物組織電特性的檢測(cè)和成像,能夠?yàn)橄嚓P(guān)疾病的早期診斷提供重要依據(jù);诖怕曬詈闲(yīng)的生物組織電特性檢測(cè)成像方法[4-5],由于具有無創(chuàng)、造價(jià)較低、能夠反映生物組織早期病變,同時(shí)兼具有電阻抗成像對(duì)比度高和超聲成
【相似文獻(xiàn)】
相關(guān)期刊論文 前4條
1 段汕;趙淑珍;馮光瓊;錢磊;;基于信噪比和頻譜特征改進(jìn)的基因預(yù)測(cè)方法研究[J];中南民族大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年02期
2 萬芷君;明媚;王婷;栗麗兵;;基因預(yù)測(cè)中的信噪比計(jì)算新模型[J];廣西科學(xué)院學(xué)報(bào);2013年01期
3 徐涇平,程敬之;生理聲信號(hào)分析的進(jìn)展[J];科技導(dǎo)報(bào);1995年04期
4 劉艷;李前樹;;隨機(jī)擾動(dòng)和周期信號(hào)對(duì)基因調(diào)控系統(tǒng)的影響[J];分子科學(xué)學(xué)報(bào);2007年06期
相關(guān)會(huì)議論文 前2條
1 陳其才;張銘;李安邦;吳飛健;;聲信號(hào)處理過程中神經(jīng)元間的相互作用[A];新世紀(jì) 新機(jī)遇 新挑戰(zhàn)——知識(shí)創(chuàng)新和高新技術(shù)產(chǎn)業(yè)發(fā)展(上冊(cè))[C];2001年
2 萬芷君;明媚;王婷;栗麗兵;;基因預(yù)測(cè)中的信噪比計(jì)算問題[A];廣西計(jì)算機(jī)學(xué)會(huì)2012年學(xué)術(shù)年會(huì)論文集[C];2012年
,本文編號(hào):1470534
本文鏈接:http://sikaile.net/yixuelunwen/swyx/1470534.html