Optimal Design of Transcranial Magnetic Stimulation Thin Core Coil With Trade-Off Between Stimulation Effect and Heat Energy

Abstract

Transcranial magnetic stimulation (TMS) has been proven to be effective in treating many psychiatric disorders. The stimulus intensity and focality of the TMS coil are normally used to measure the effect of biological stimulation. In order to improve the performance of the coil, the magnetic core can be added to the existing coils to enhance the stimulus intensity and focality of the local space. However, the core loss caused by the high frequency alternating magnetic field in the core should not be neglected. In this paper, the optimal design of transcranial magnetic stimulation thin core coil with the trade-off between stimulation effect and heat energy is proposed. By building multi-objective optimization model and using exhaustive search, the dimensions of the magnetic core is reasonably designed, the stimulation effect of the coil can be significantly improved, the heat energy generated by the core can be reduced compared to other core coils. The finite element method is used to analyze and compare the stimulation effect before and after adding the magnetic core. The simulation results verify the superiority of the proposed design.