功能磁刺激线圈阵列设计与场分布计算

目的：实现在目标区域内的电磁场聚焦，解决功能磁刺激的兴奋点定位问题。方法：建立了单线圈磁刺激模型并设计了半球形和平面聚焦线圈阵列，而后使用经过改进的自适应遗传算法对注入阵列各子线圈电流的大小和相位进行了优化。结果：通过计算，显示了线圈阵列在优化后的电流组态下产生的磁场和电场在计算区域内的分布和二维等高线图。结论：本文提出的聚焦线圈阵列可在目标区域产生具有良好聚焦性能的电磁场分布，并具有可同时聚焦至多个靶目标的能力。

Design and Field Calculation of Coil Array for Functional Magnetic Stimulation

Objective To locate the activation point in functional magnetic stimulation (FMS). Method Coil arrays were applied to establish the magnetic field distribution with ideal focusing capability. Models of hemispherical and plane coil arrays were established. Then an improved adaptive genetic algorithm (GA) was applied in the optimization of value and phase of the electric current infused into each coil. Result Based on the calculated results of the optimized current configurations, ideal focusing capability was drawn as contour lines and 3-D mesh charts of the magnitude of magnetic and electric field within the calculated area. Conclusion It was shown that the coil arrays have good capability to establish the magnetic distribution in focused shape. In addition, it was also shown that the coil arrays have the capability of focusing on two or more targets simultaneously.