脉冲磁激励的磁声效应和热声效应的仿真研究
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摘要
我们根据电磁场辐照低电导率样本时电磁场和声波场之间的耦合关系,对脉冲磁激励的磁声效应和热声效应展开研究。本文基于电磁场理论和声波传播理论知识,推导了脉冲磁激励的声压波动方程;构建二维载流线圈和低电导率圆形薄片模型以模拟成像物理环境,利用有限元方法分析瞬态电磁场;并且根据电磁场仿真结果,进行磁声效应和热声效应所产生的声场仿真计算。仿真结果表明,微秒级高斯脉冲磁场激励下,低电导率样本中热声效应比磁声效应大,且起主要作用;微秒级高斯脉冲磁场和0.2 T静磁场激励下,低电导率样本中热声效应和磁声效应共存。该研究为感应式磁声成像和磁热声成像的进一步应用奠定了基础。
According to the coupling relationship of electromagnetic field and acoustic field when electromagnetic field irradiates low conductivity objects, we carried out a study on the magnetoacoustic effect and thermoacoustic effect in pulsed magnetic excitation. In this paper, we provide the pressure wave equation in pulsed magnetic excitation based on the theory of electromagnetic field and acoustic wave propagation. A 2-dimensional coil carrying current and a circular thin sheet model were constructed to simulate the physical imaging environment. The transient electromagnetic field was simulated using finite element method. Numerical studies were conducted to simulate the pressures excited by magnetoacoustic effect and thermoacoustic effect according to the result of electromagnetic simulation. It was shown that the thermoacoustic effect played a leading role in the low conductivity objects on the microsecond Gauss pulsed magnetic excitation, and thermoacoustic effect and magnetoacoustic effect coexisted on the microsecond Gauss pulsed magnetic field and 0.2 T static magnetic field excitation. This study lays the foundation for the further application of magnetoacoustic tomography with magnetic induction and magnetically mediated thermoacoustic imaging.
According to the coupling relationship of electromagnetic field and acoustic field when electromagnetic field irradiates low conductivity objects, we carried out a study on the magnetoacoustic effect and thermoacoustic effect in pulsed magnetic excitation. In this paper, we provide the pressure wave equation in pulsed magnetic excitation based on the theory of electromagnetic field and acoustic wave propagation. A 2-dimensional coil carrying current and a circular thin sheet model were constructed to simulate the physical imaging environment. The transient electromagnetic field was simulated using finite element method. Numerical studies were conducted to simulate the pressures excited by magnetoacoustic effect and thermoacoustic effect according to the result of electromagnetic simulation. It was shown that the thermoacoustic effect played a leading role in the low conductivity objects on the microsecond Gauss pulsed magnetic excitation, and thermoacoustic effect and magnetoacoustic effect coexisted on the microsecond Gauss pulsed magnetic field and 0.2 T static magnetic field excitation. This study lays the foundation for the further application of magnetoacoustic tomography with magnetic induction and magnetically mediated thermoacoustic imaging.
引文
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19陶春静,宋涛,吴石增,等.微波激励热声成像中微波源参数选择的理论分析.北京生物医学工程,2007,26(1):22-26.
2Fear E C,Hagness S C,Mraneyp M,et al.Enhancing breast tumor detectionwith near-field imaging.IEEE Microwave Magazine,2002,3(1):48-56.
3QIAO Guofeng,Wang Wei,Duan Wei,et al.Bioimpedance analysis for the characterization of breast cancer cells in suspension.IEEE Trans Biomed Eng,2012,59(8):2321-2329.
4Gabriel C.Compilation of the dielectric properties of body tissues at RF and microwave frequencies.London:King's College London,1996.
5陈晶,刘国強,夏慧.基于矩阵模型的感应式磁声重建算法.现代科学仪器,2013(2):34-38.
6刘国强.磁声成像技术.北京:科学出版社,2014.
7Wang Jiawei,Zhou Yuqi,Sun Xiaodong,et al.Acoustic source analysis of magnetoacoustic tomography with magnetic induction for conductivity gradual-varying tissues.IEEE Trans Biomed Eng,2016,63(4):758-764.
8Guo Liang,Liu Guangfu,Yang Yanju.Difference frequency magnetoacoustic tomography without static magnetic field.Applied Physics Express,2015,8(8):086601.
9Feng Xiaohua,Gao Fei,Zheng Yuanjin.Magnetically mediated thermoacoustic imaging toward deeper penetration.Appl Phys Lett,2013,103(8):083704-083707.
10Feng Xiaohua,Gao Fei,Zheng Yuanjin.Magnetically mediated thermoacoustic imaging//Proceedings of the Conference on Photons Plus Ultrasound:Imaging and Sensing 2014.San Francisco,California,United States,2014,894343.
11Mashal A,Booske J H,Hagness S C.Toward contrast-enhanced microwave-induced thermoacoustic imaging of breast cancer:an experimental study of the effects of microbubbles on simple thermoacoustictargets.Phys Med Biol,2009,54(3):641-650.
12Zackrisson S,van de Ven S M,Gambhir S S.Light in and sound out:emerging translational strategies for photoacoustic imaging.Cancer Res,2014,74(4):979-1004.
13Feng Xiaohua,Gao Fei,Kishor R,et al.Coexisting and mixing phenomena of thermoacoustic and magnetoacoustic waves in water.Sci Rep,2015,5:11489.
14Hellund E J,Naff J T,Brumfield R C.Magnetoacoustics and thermoacoustics--new ideas in underwater soundsources.Sound Its Uses&Control,1963,2(2):33-38.
15倪光正.工程电磁场原理.北京:高等教育出版社,2008.
16雷银照.轴对称线圈磁场计算.北京:中国计量出版社,1991.
17 Nguyen M Q,Hughes Z,Woods P,et al.Field distribution models of spiral coil for misalignment analysis in wireless power transfer systems.IEEE Trans Microw Theory Tech,2014,62(4,2,SI):920-930.
18宋显锦.多负载分组磁谐振耦合无线电能传输研究.北京:中国科学院大学,2016.
19陶春静,宋涛,吴石增,等.微波激励热声成像中微波源参数选择的理论分析.北京生物医学工程,2007,26(1):22-26.
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