A double frequency magnetic induction tomography system: Analysis and simulations

Abstract

Magnetic induction tomography (MIT) is a new technique for reconstruction of the electrical conductivity and magnetic permeability inside biological target objects. Previous publications mainly focus on the electrical conductivity. But the magnetic property of biological tissues is equally important to a tomography system. This article presents a comprehensive analysis of electrical conductivity and magnetic permeability. The theoretical principle of magnetic dipole model which considering effects of magnetized is presented. The theoretical derivation results show that there is a linear correlation between real component of signal/carrier ratio and magnetic permeability. The results also show that there is a linear correlation between imaginary component of signal/carrier ratio and electrical conductivity. A finite element model is established based on ANSYS software. Using the ANSYS software, we have finished two simulation experiments. They are the electrical conductivity and magnetic permeability tests at 10 MHz and 100 KHz respectively. The simulation experiment results accord well with the theoretical analyses. It proves that the system can be applied to two different detections if its frequency can be selective. We provide a discussing of two different applications with the same measurement system. This expanded the application scope of MIT system in the biomedical engineering.