基于遗传算法的经颅磁刺激线圈阵列设计与场分布计算

为解决经颅磁刺激的兴奋点定位问题提出了以圆环面聚焦线圈阵列实现电磁聚焦的方案。而后,使用经过改进的自适应遗传算法对注入阵列各单元线圈电流的大小和相位进行了优化,在目标区域内很好的实现了电磁聚焦。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,表明了该聚焦线圈阵列可在目标区域产生具有良好聚焦性能的电场和磁场分布,并具有可同时聚焦至多个目标的能力。

Design and Field Calculation of Coil Array for Transcranial Magnetic Stimulation(TMS) Based on Genetic Algorithm

It is the intent of this paper to locate the activation po int in Transcranial Magnetic Stimu lation (TMS) efficiently. The schemes of coil array in torus shape is presented to get the electromagnetic field distribution with ideal focusing capa bility. Then an improved adaptive genetic algorithm (AGA) is applied to the op timization of both value and phase of the current infused in each coil. Based o n the calculated results of the optimized current configurations, ideal focusing capability is drawn as contour lines and 3-D mesh charts of magnitude of both m agnetic and electric field within the calculation area. It is shown that the coi l array has good capability to establish focused shape of electromagnetic distri bution. In addition, it is also demonstrated that the coil array has the capabil ity to focus on two or more targets simultaneously.