Electromagnetic Field Simulation of 3D Realistic Head Model During Transcranial Magnetic Stimulation

Transcranial magnetic stimulation (TMS) is a powerful, non-invasive tool for investigating functions in the brain. The target inside the head is stimulated with eddy currents induced in the tissues by the time-varying magnetic field. TMS has been used in several applications in medical and clinical research which include brain mapping, treatment of mood disorder and schizophrenia, treatment of epilepsy, treatment of chronic pain and so on. The stimulation effect can be affected by stimulation site and intensity which are changed with the shape and parameters of the coil. In this paper, the electromagnetic field induced in the head by two kinds of coils which are usually used in study and treatments during TMS has been analyzed. This three-dimensional simulation is useful for eddy currents evaluation and spatial localization of stimulation.