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Modeling and Simulating Study on the Distribution of Acoustic Source Inducted by Magneto-acoustic Coupling Effect via ANSYS

LI Li,YIN Tao,ZHANG Shunqi,LIU Zhipeng(Institute of Biomedical Engineering,Peking Union Medical College & Chinese Academic of Medical Sciences,Tianjin 300192,China)  
Aim-Magneto-acoustic tomography with magnetic induction(MAT-MI) is a recently proposed imaging modality to image the electrical impedance of biological tissue, key points in both of the theory and experiment still require more researches.We implemented simulating experiments to investigate the distribution of the induced current and the acoustic source induced by MAT-MI.The simulating experiments analyzed the relationships of the acoustic source with the electric conductivity of the model,the feature of exciting pulsed magnetic fields,the static magnetic field and the induced electric field were analyzed.A three-dimensional Helmholtz coil and a two-layer conductivity cubic simulating model with different conductivity were set up as well as transient electromagnetic finite element analysis was carried out by using ANSYS FEM software,the distributions of the induced electric current and acoustic source were obtained in the conductors with different conductivity inside the model.The simulation results suggest that acoustic resources are produced inside the homogeneous medium as well as on the conductivity boundary between mediums,however,the induced current and the acoustic source vary rapidly on the boundary between different conductivity compared with that inside cubes and on the boundary of two-layers cubes.
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