Comput Math Methods Med - Numerical study of magnetoacoustic signal generation with magnetic induction based on inhomogeneous conductivity anisotropy.

Tópicos

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Resumo

Magnetoacoustic tomography with magnetic induction (MAT-MI) is a noninvasive imaging modality for generating electrical conductivity images of biological tissues with high spatial resolution. In this paper, we create a numerical model, including a permanent magnet, a coil, and a two-layer coaxial cylinder with anisotropic electrical conductivities, for the MAT-MI forward problem. We analyze the MAT-MI sources in two cases, on a thin conductive boundary layer and in a homogeneous medium, and then develop a feasible numerical approach to solve the MAT-MI sound source densities in the anisotropic conductive model based on finite element analysis of electromagnetic field. Using the numerical finite element method, we then investigate the magnetoacoustic effect of anisotropic conductivity under the inhomogeneous static magnetic field and inhomogeneous magnetic field, quantitatively compute the boundary source densities in the conductive model, and calculate the sound pressure. The anisotropic conductivity contributes to the distribution of the eddy current density, Lorentz force density, and acoustic signal. The proposed models and approaches provide a more realistic simulation environment for MAT-MI.

Resumo Limpo

magnetoacoust tomographi magnet induct matmi noninvas imag modal generat electr conduct imag biolog tissu high spatial resolut paper creat numer model includ perman magnet coil twolay coaxial cylind anisotrop electr conduct matmi forward problem analyz matmi sourc two case thin conduct boundari layer homogen medium develop feasibl numer approach solv matmi sound sourc densiti anisotrop conduct model base finit element analysi electromagnet field use numer finit element method investig magnetoacoust effect anisotrop conduct inhomogen static magnet field inhomogen magnet field quantit comput boundari sourc densiti conduct model calcul sound pressur anisotrop conduct contribut distribut eddi current densiti lorentz forc densiti acoust signal propos model approach provid realist simul environ matmi

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