Analysis of induced electromagnetic fields in a human head phantom by different TMS coil configurations

The uses of transcranial magnetic stimulation (TMS) for the treatment of psychological disorders and other therapeutically purposes are increasing worldwide. The TMS process becomes popular because of its noninvasive operation method. The stimulation coil play one of the vital role for efficient treatment. In this paper three coils including halo, double cone, and halo and double cone assembly coil are designed, simulated, and evaluated. According to the simulation results, it is found that the halo and double cone assembly coil improves penetration depth and provides greater electric field and magnetic flux. It also gives concentrating electric field inside cortex region. Moreover, the halo coil working with double cone coil provide a flexible way to stimulate the deeper brain region.