基于多路放大器加法电路噪声抑制的热声成像技术  

Thermoacoustic imaging based on noise suppression of multi-channel amplifier and additive circuit

作　　者：汤永辉 郑铸[1] 谢实梦 黄林[1] 蒋华北 Tang Yong-Hui;Zheng Zhu;Xie Shi-Meng;Huang Lin;Jiang Hua-Bei(School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;Department of Medical Engineering,University of South Florida,Florida 33612,USA)

机构地区：[1]电子科技大学电子科学与工程学院,成都611731 [2]南佛罗里达大学医学工程系,佛罗里达33620

出　　处：《物理学报》2020年第24期106-111,共6页Acta Physica Sinica

基　　金：国家自然科学基金青年科学基金(批准号:61701076);四川省科技计划项目重点研发计划(批准号:2019YFS0119,2019YFS0127)资助的课题.

摘　　要：热声成像信噪比往往较低,为提高信噪比,通常需要通过对热声信号进行多次取平均.然而,通过取平均提高信噪比的方式会降低热声成像时间分辨率,阻碍快速热声成像技术的发展.本文提出一种基于多路放大器加法电路的低成本快速热声成像技术,将超声换能器接收到的热声信号分成四路同时进入四个放大器,放大后再将该四路信号经过加法电路累加输入到采集系统中,实现硬件层面的取平均去噪.仿体实验结果表明:通过基于多路放大器加法电路的低成本快速热声成像技术,成像时间分辨率提高了5倍,信噪比由~6 dB提升到了~12 dB.本文通过低成本的简单加法电路原理,既提高了热声成像技术时间分辨率,又提升了成像信噪比,为快速热声成像技术的发展提供了一种崭新的技术,有助于推动热声成像技术的发展和临床应用.Thermoacoustic imaging(TAI)is an emerging biomedical imaging method in which microwave is used as an excitation source to generate acoustic signals.The TAI possesses the advantages of high contrast of microwave imaging and high resolution of ultrasound imaging,which is also noninvasive.While the signal-tonoise ratio(SNR)of TAI is often very low.It is usually required by averaging the thermoacoustic signal many times to improve the SNR.However,averaging the signal to improve the SNR can significantly reduce the TAI’s time resolution,which hinders the development of rapid TAI.Here in this paper,we propose to reduce the cost and improve the time resolution of TAI based on multi-channel amplifier and additive circuit.The received thermoacoustic signals are divided into 4 channels and then entered into 4 amplifiers simultaneously.After being amplified,the signals are added and collected by the data acquisition system for reconstructing the image.The phantom results indicate that the time resolution of TAI increases 5 times and the SNR rises from 6 dB to 12 dB,with the multi-channel amplifier and additive circuit adopted.The method proposed in this paper is helpful in promoting the development and clinical application of TAI,especially it has a great significance for developing the ultra-fast TAI.

关 键 词：热声成像 低成本 加法电路 时间分辨率 

分 类 号：TN721[电子电信—电路与系统] TP391.41[自动化与计算机技术—计算机应用技术]