Simulation study for a new magnetic induction tomography coil system with weakly perturbing in conducting background.

Biomedical magnetic induction tomography (MIT) aims to reconstruct the passive electrical properties within biological tissues, especially the electrical conductivity. A weak perturbation inside a conducting object is put in the improved MIT coil system which uses the two-arm Archimedean spiral coil as the excitation coil and the circular coil as the receiver coil. The forward problem for this model is calculated by three-dimension electromagnetic simulation experiments. Under the different simulation conditions, the phase shift of voltage induced in the receiver coil is compared with that for the common model using the circular coil as the excitation and receiver coil. The results show that the sensitivity to the improved model is much higher than that to the common model except for the case that the perturbation appears in y-axis, which effectively confirms the previous conclusions and indicates that the improved coil system has the potential advantage for MIT image reconstruction.