经颅磁刺激铁芯线圈的优化设计研究

Research on Optimal Design of Transcranial Magnetic Stimulation Coil with Iron Core

目的研究铁芯的位置与大小对经颅磁刺激线圈特性的影响,并设计经颅磁刺激铁芯线圈。方法在8字形线圈和双锥形线圈结构中引入不同位置、尺寸的铁芯,利用COMSOL软件进行有限元仿真,分析最大诱发电场、刺激深度、聚焦性变化规律,并通过品质因子对线圈的综合性能进行评估。结果基于8字形线圈的优化中,铁芯两脚靠近线圈相近两边,填充因子为0.1的slinky铁芯线圈获得了最优综合性能,而铁芯两脚靠近线圈相近两边,填充因子为0.4倾斜绕制的双锥形线圈作为深度刺激线圈性能最优。结论提出的基于铁芯优化的经颅磁刺激线圈优化设计方法及针对8字形及双锥形线圈的最优化铁芯线圈结构,获得了包括诱发电场强度、刺激深度、聚集性、热损耗的最优综合性能。

Objective To study the influence of the position and size of the iron core on the characteristics of the transcranial magnetic stimulation coil and to design the transcranial magnetic stimulation coil with iron core.Methods Iron cores of different sizes were added to different positions of the figure-eight coil slinky coil and twin coil structure.COMSOL software was used to perform finite element simulation to analyze the maximum induced electric field,stimulation depth,and focus changes.The comprehensive performance of the coil was evaluated through the quality factor.Results The optimization of the figure-eight coil showed that the slinky iron core coil could obtain the best overall performance with a fill factor of 0.1 and the two legs of the iron core close to the two sides of the coil.While the obliquely wound twin coil had the best performance as a deep stimulation coil with a fill factor of 0.4 and the two legs of the iron core close to the two sides of the coil.Conclusion An optimized design method for transcranial magnetic stimulation coils based on iron core optimization was proposed.The optimized iron core coil structures were given for the figure-eight and twin coils,and the best comprehensive performance was obtained including the induced electric field^strength,stimulation depth,focus,and heat loss.