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提出一种可提高经颅磁刺激8字形线圈聚焦性的方法,即使用高电导率材料制作的窗口挡板减小线圈感应电场聚焦区域面积,并抑制负峰能量,同时采用高磁导率材料制作的导磁体增强线圈感应电场的正峰能量.建立了盐水槽仿真模型,并结合ANSYS有限元仿真,分析窗口板和导磁体对8字线圈感应电场分布的影响.分别使用铜和铁氧体制作了与仿真模型一致的窗口板和导磁体,使用盐水槽和Magstim Rapid2型磁刺激仪验证了仿真结果.结果表明,结合导磁体比单独使用窗口板具有更好的提高8字形线圈聚焦性能的效果.该方法可以灵活运用到经颅磁刺激线圈实际使用过程中,相比设计新型线圈而言,工作量更少,复杂性更低.
A method of improving the focusing of a figure-eight coil of transcranial magnetic stimulation is proposed. That is, a window baffle made of a highly-conductive material is used to reduce the area of the focusing electric field of the coil and suppress the negative peak energy while using a high-permeability material The induced magnetism enhances the positive peak energy of the induced electric field of the coil.The salt tank simulation model is established and the influence of the window plate and the conducting magnet on the induced electric field distribution of the 8-word coil is analyzed by ANSYS finite element simulation.Using copper and ferrite The window plate and magnetizer which are consistent with the simulation model were fabricated and the simulation results were verified by using salt water tank and Magstim Rapid2 magnetic stimulator.The results showed that the combined magnetizer had a better performance in enhancing the focusing performance of the figure-eight coil than the window plate alone Effect.This method can be flexibly applied to the actual use of transcranial magnetic stimulation coil, compared with the design of a new coil, the workload less complex lower.