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

Author: LiLi
Tutor: LiuZhiPeng
School: Beijing Union Medical College
Course: Biomedical Engineering
Keywords: Magneto-acoustic Tomography with magnetic induction forward problem Conductivity Induced currents Acoustics source ANSYS
CLC: R318.0
Type: Master's thesis
Year: 2011
Downloads: 56
Quote: 0
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Abstract


In medical imaging, tissue electrical properties such as conductivity, permeability and the electromagnetic absorption coefficient as well as other nonlinear parameter are of interest in various applications of tissue electrical properties tomography. Reconstruction of these electrical properties parameters may provide supplementary or even more useful information about the physiological and pathological status of biological tissue and could be used to help early diagnosis.Magneto-acoustic Tomography with Magnetic Induction (MAT-MI) is a recently proposed imaging modality to image the electrical impedance of a biological tissue. It combines the good contrast of electrical impedance tomography with the high spatial resolution of ultrasonic imaging sonography.In this thesis, theoretical calculation was made to derive the acoustic source mechanism in MAT-MI forward problem using the finite element method (FEM). In combination with the theory of electromagnetic fields, 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 investigated. A three-dimensional circular cylindrical 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, and hence, the distributions of the induced electric current and acoustic source were obtained in the conductors with different conductivity inside the model.The simulation results suggested that acoustic resources were produced inside the homogeneous medium as well as on the conductivity boundary between mediums, however, the induced current and the acoustic source varied rapidly on the boundary between different conductivity compared with that inside cubes and on the boundary of two-layers cubes. And hence, it can be revealed that the method presented in this study could be applied to analyze the electromagnetic field and acoustic source for irregular-shape conductivity model.

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