Objective To design a new type of coil and use a shield plate to optimize the focusing area,so that the coil can meet the usage requirements to the greatest extent possible. Methods Based on a 3-layer head model,COMSOL simulation software was used to establish a real human head model. After effectiveness verification,the traditional 8-shaped coil,new coil,and head model were jointly simulated to explore the optimal performance parameters of the new coil. The focusing performance was further improved by adding a shield plate,and the effects of different shield plate window sizes on focusing performance were analyzed. Results Compared with the traditional 8-shaped coil,the new coil improved the magnetic field intensity in the brain by 32％,increased the stimulation depth by 152％,but slightly expanded the focusing area,decreasing the focusing performance by 7.2％,which demonstrated the superior performance of the new coil than the traditional 8-shaped coil. After optimization using a shield plate with a window size of 600 mm2,the focusing performance of the new coil was improved by 30％,verifying the effectiveness of the shield plate on the coil performance. Conclusion The feasibility of the new coil is proved in terms of performance parameters,and the effects of different coil sizes and shield plate sizes on evaluation indicators are explored,laying a foundation for subsequent research on transcranial magnetic stimulation.

Objective To design a new type of coil and use a shield plate to optimize the focusing area,so that the coil can meet the usage requirements to the greatest extent possible. Methods Based on a 3-layer head model,COMSOL simulation software was used to establish a real human head model. After effectiveness verification,the traditional 8-shaped coil,new coil,and head model were jointly simulated to explore the optimal performance parameters of the new coil. The focusing performance was further improved by adding a shield plate,and the effects of different shield plate window sizes on focusing performance were analyzed. Results Compared with the traditional 8-shaped coil,the new coil improved the magnetic field intensity in the brain by 32％,increased the stimulation depth by 152％,but slightly expanded the focusing area,decreasing the focusing performance by 7.2％,which demonstrated the superior performance of the new coil than the traditional 8-shaped coil. After optimization using a shield plate with a window size of 600 mm2,the focusing performance of the new coil was improved by 30％,verifying the effectiveness of the shield plate on the coil performance. Conclusion The feasibility of the new coil is proved in terms of performance parameters,and the effects of different coil sizes and shield plate sizes on evaluation indicators are explored,laying a foundation for subsequent research on transcranial magnetic stimulation.