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Magnetically Mediated Thermoacoustic imaging (MMTAI) is a noninvasive imaging approach for electrical impedance. It collects ultrasound signals induced by thermal expansion to reconstruct the conductivity of the object with high spatial resolution and high contrast. Previously reported experimental results on MMTAI only were obtained from the high conductivity samples like the metal. In the study,...
We fabricate a silicon nanorod-based metasurface that shows vivid colors. Each nanorod supports electric and magnetic dipole modes whose coupling leads to collective resonances. The reflected field is described by a classical coupled dipole model.
To develop image logging technology, this paper studies array magnetoacoustic tomography with magnetic induction(MAT-MI) on the basis of contrasting the research of home and abroad. Through design, computer simulation and experiment studies on generating system of pulsed magnetic field, we demonstrated that the pulsed power supply can realize narrow width, high peak and repeat pulsed current with...
Magnetoacoustic impedance tomography with magnetic induction (MAT-MI) is a new imaging method. Its images reflect conductivity distribution. In this paper, we firstly proposed the numerical simulation method of multi-physics fields coupling to obtain the distribution of acoustic field in MAT-MI without the static magnetic field. Simple acoustic detection experiments are conducted to validate the algorithm...
Image reconstruction is the key problem of MAT-MI. At present, there are certain problems for the images reconstruction methods which based on the divergence of Lorentz force, therefore, a new reconstruction method which based on the Lorentz force instead of its divergence is proposed in this paper. The singularity on the interface can be avoided, and it is possible to reconstruct the conductivity...
Method for electromagnetic field problem of magnetoacoustic tomography with magnetic induction (MAT-MI) is presented, in which the static magnetic field need not rotating, and the transient electromagnetic effect which produced by the time-varying excitation can be taken into account. Beside, the huge computational effort for 3D cases can be reduced effectively. Program which based on the method was...
Magnetoacoustic tomography with magnetic induction (MAT-MI) is a new imaging method aimed at obtaining the distribution of conductivity. In this paper, the distribution of time varying electromagnetic field in three dimensional model generated by the given pulse magnetic field is calculated. Meanwhile, our reconstruction technique to obtain the distribution of conductivity in MAT-MI without the rotation...
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