Study of the Electromagnetic Field of Transcranial Magnetic Stimulation Based on the Real Head Model

This paper presents the application of finite element method in analysis of the electromagnetic field within real head model exposed to a time varying magnetic field produced by the circuit-driving loop. To analyze the electromagnetic field under Transcranial Magnetic Stimulation precisely and display the stimulating effect of the loops in different geometrical forms, a 3-D real head model reconstructed from the CT Images is used to simulate the head. Based on the practical circuit of the magnetic stimulating instrument, the cerebral electromagnetic field produced by the loops of 4 different forms is analyzed with their electromagnetic performance evaluated. The work can provide the academic and practical basis for further study upon Transcranial Magnetic Stimulation and developing more complicated loop or loop array.