摘要
针对放射治疗系统中多叶准直器叶片位置精度的控制要求,描述了适形放射治疗装置中多叶准直器的结构和工作原理.把驱动多叶准直器叶片运动的无刷直流电机作为被控对象,提出了基于PSO算法的PID控制器的设计方法.首先,对无刷直流电机进行了建模,而后,采用基本粒子群算法对无刷直流电机的PID控制器各项参数进行优化,以保证多叶准直器叶片的到位精度,满足适形放疗的要求.仿真结果表明所使用的方法能较好地满足多叶准直器叶片位置控制的精度要求,各项控制指标明显优于传统整定方法.
According to requirements of the leaves position precision control of multi-leaf collimator, the structure and working principle of multi-leaf collimator of conformal radiation therapy apparatus are de- scribed. The motor that drives the leaf of the MLC is taken as the control object,and the design method of PSO-PID controller is proposed. Firstly, the module of the motor has been established,then PSO algorithm is used for the parameter optimization of PID controller in order to ensure the position accuracy of the MI.C leaves and meet the requirements of conformal therapy. The results indicate that this algorithm can meet the needs of the control precision of the leaves＂ position of the multi-leaf collimator. In conclusion, the con- trol index is obviously better than the traditional tuning method.
出处
《兰州交通大学学报》
CAS
2013年第6期15-18,40,共5页
Journal of Lanzhou Jiaotong University
基金
国家自然基金(61162016
60962004)
甘肃省科技支撑计划项目(1104FKCA102
1104GKCA057)
金川公司-兰州交通大学预研基金项目
关键词
粒子群算法
PID控制器
参数优化
放射治疗
多叶准直器
particle swarm optimization
PID controller
parameter optimization
radiation therapy
multi-leaf collimator
