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.