Simulation of the Influence of Permanent Magnets of the Same Polarity on the Magneto-Acoustic Concentration Tomography of Magnetic Nanoparticles with Magnetic Induction Process
Yan Xiaoheng, Li Zhengxing, Pan Ye, Chen Weihua
Faculty of Electrical and Control Engineering Liaoning Technology University Huludao 125000 China
Magneto-acoustic concentration tomography of magnetic nanoparticles (MNPs) with magnetic induction (MACT-MI) is a new method for concentration imaging of MNPs based on the magneto-acoustic coupling effect. To reduce the excitation source amplitude and increase the signal-to-noise ratio of the magneto-acoustic signal, a new idea was proposed in this paper: the same polarity as the permanent magnet was added in the MACT-MI. According to the Langevin paramagnetic theory, the electromagnetic and acoustic characteristics of MAT-MI after adding permanent magnets with the same polarity were studied, the magnet system was designed, and the concentration gradient model was established. By multi-physics simulation software COMSOL, the 2D distribution of magnetic flux density, magnetic force and sound pressure and the corresponding 1D curve were obtained, which clearly show the physical process of MAT-MI. This conclusion indicates that adding permanent magnets of the same polarity, MNPs receive stronger magnetic force and can obtain magneto-acoustic signals with a larger signal-to-noise ratio, which is conducive to the acquisition of acoustic signals. At the excitation of the magnet system, the sound pressure generated by MNPs is symmetrically distributed up and down and in opposite directions. At the uniform concentration model, the sound pressure peak appears at the concentration boundary, and the peak of the sound pressure of the concentration gradient model appears at the center of the gradient. The results can provide a research foundation for the design of imaging equipment, follow-up experiments and clinical applications of MACT-MI.
闫孝姮, 李政兴, 潘也, 陈伟华. 相同极性永磁体对感应式磁声磁粒子浓度成像过程影响的仿真[J]. 电工技术学报, 2022, 37(8): 1926-1937.
Yan Xiaoheng, Li Zhengxing, Pan Ye, Chen Weihua. Simulation of the Influence of Permanent Magnets of the Same Polarity on the Magneto-Acoustic Concentration Tomography of Magnetic Nanoparticles with Magnetic Induction Process. Transactions of China Electrotechnical Society, 2022, 37(8): 1926-1937.
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