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多叶光栅是精确放射治疗必需的设备之一。目前临床上多使用多叶光栅代替传统挡铅完成三维适形治疗和静态调强治疗,动态调强治疗所要求的对多叶光栅叶片速度控制的实时性和高精度一直难以实现。针对动态调强对叶片控制的要求,以C8051F023为核心处理器,结合专用电机驱动芯片NJM3771D2,设计了多叶光栅叶片控制模块。并发展了PID闭环控制方法,对多叶光栅叶片的运动位移和速度进行了实时反馈测速、分析和PWM输出调节,实现了对多叶光栅叶片运动位移和速度的精确控制,满足多叶光栅动态调强对叶片的控制要求。此模块设计结构简单,稳定可靠,控制精度高,将应用于具有动态调强功能的多叶光栅系统的实现中。
Multi-lobe gratings are one of the necessary devices for precision radiotherapy. At present, the multi-lobe grating is used instead of the traditional block lead to complete the three-dimensional conformal treatment and the static intensity-adjusting treatment. The real-time and high precision of the multi-lobe grating blade velocity control required by the dynamic tonometry is always difficult to be realized. Aiming at the requirements of dynamic intensity control on blade control, C8051F023 is used as the core processor, combined with a dedicated motor driver chip NJM3771D2, a multi-leaf grating blade control module is designed. The closed-loop PID control method is developed. Real-time feedback velocity measurement, analysis and PWM output adjustment of multi-leaf grating motion and velocity are realized. The control of multi-leaf grating motion and velocity are realized precisely. Adjust the strength of the blade control requirements. The design of this module is simple, stable and reliable, and has high control precision. It will be used in the realization of multi-leaf grating system with dynamic intensity adjustment.