组织电导率性质对磁感应磁声耦合成像声源强度的影响

针对部分生物组织电导率分布具有各向异性的特点，对磁感应磁声耦合成像的声源强度特征进行理论分析，推导不同电导率性质的声源强度公式，并运用COMSOL Multiphysics5.5建立生物组织电导率模型，进行电磁场仿真分析求解，用Matlab 2016a计算其振动声源。结果证明，在同样磁场激励条件下，电导率各向同性和各向异性的声源分布都能反映生物组织的层析结构，但其强度不同。本研究为磁感应磁声耦合成像逆问题声源的精确重建提供了理论基础。

Effects of tissue conductivity properties on acoustic source intensity for magnetoacoustic tomography with magnetic induction

In view of the fact that the conductivities of some biological tissues are anisotropic, the characteristics of acoustic source intensity for magnetoacoustic tomography with magnetic induction are theoretically analyzed, and the formula of acoustic source intensity with different conductivity properties is deduced. A biological tissue conductivity model is established using COMSOL Multiphysics5.5 for electromagnetic field simulation analysis, and the vibration acoustic source is calculated using Matlab 2016a. The results show that both the acoustic sources with isotropic and anisotropic conductivities can reflect the tomographic structure of biological tissues under the same magnetic field excitation conditions, but the acoustic source intensities are different. This study provides a theoretical basis for the accurate acoustic source reconstruction for magnetoacoustic tomography with magnetic induction.