Design of the Position Controller for the Leaves of MLC Based on Anti-windup

Abstract

According to requirements of the leaves position precision control of multi-leaf collimator (MLC) in the process of radiotherapy, the structure and working principle of the multi-leaf collimator of conformal radiation therapy apparatus was described. The motor that drives the leaf of the MLC was taken as the control object. Firstly, the module of the motor has been established, and then the PSO algorithm was used for the parameter optimization of fractional order Anti-windup controller, in order to ensure the position accuracy of the MLC leaves and meet the requirements of conformal therapy. The experimental results show that this method can meet the needs of the control precision of the leaves' position of the multi-leaf collimator, the control effect, especially in the aspect of anti-interference is better than the traditional PID controller.