基于高斯包络调制激励的磁声信号频率分析  

Frequency analysis on magneto-acoustic signal excited by modulated pulses with Gaussian envelope

作　　者：张鑫山 杨铭 张伟[1] 张顺起[1] 马任[1] 殷涛[1] 刘志朋[1] ZHANG Xinshan;YANG Ming;ZHANG Wei;ZHANG Shunqi;MA Ren;YIN Tao;LIU Zhipeng(Institute of Biomedical Engineering,Chinese Academy of Medical Sciences & Peking Union Medical College,Tianjin 300192,China)

机构地区：[1]中国医学科学院北京协和医学院生物医学工程研究所,天津300192

出　　处：《生物医学工程研究》2019年第1期7-10,15,共5页Journal Of Biomedical Engineering Research

基　　金：国家自然科学基金资助项目(811772004;61871406);天津市自然科学基金资助项目(17JCZDJC32400);中国医学科学院医学与健康科技创新工程协同创新团队资助项目(2017-I2M-3-020)

摘　　要：本研究旨在探究基于高斯包络调制激励下,感应式磁声成像中磁声信号的频率特性。先使用4 MHz单正弦脉冲信号和中心频率为4 MHz的高斯包络调制信号,对不同电导率样本(铝、铜、锡)进行激励,使用中心频率为4 MHz的超声换能器进行接收,并对接收到的磁声信号进行频率分析。单脉冲激励方式造成磁声信号频率分析失准,基于高斯包络调制激励的磁声信号与激励信号频率一致。样本磁声信号与激励信号同频,且高斯包络调制激励方法使频率分析精度更高,频谱更为集中,更利于频域中信号特征的分析。To explore the frequency characteristics of magneto-acoustic signals in induction magneto-acoustic imaging based on Gaussian envelope-modulation excitation.The 4 MHz single-sine pulse signal and the Gaussian envelope-modulated signal featuring a center frequency of 4 MHz were used to excite samples(aluminum,copper,tin)of different electrical conductivities,an ultrasonic transducer of the center frequency of 4 MHz was introduced as the receiver and then the received magneto-acoustic signals was analyzed.The single-pulse excitation mode resulted in a misaligned frequency analysis of magneto-acoustic signals,while the magneto-acoustic signals based on Gaussian envelope-modulation excitation were of the same frequency with the excitation signal.Sample′s magneto-acoustic signals are of the same frequency with excitation signals;moreover,the method of Gaussian envelope-modulation excitation realizes a higher precision of frequency analysis and a more centralized spectrum,for which it is more conducive to the analysis of frequency characteristics within a frequency domain.

关 键 词：磁声信号 单脉冲 高斯包络 电导率 频率特性 

分 类 号：R318[医药卫生—生物医学工程]