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多叶光栅是现代医用加速器的重要组成部分之一,其控制系统的稳定性和精确度直接影响手术中病人的生命安全。但目前国内的多叶光栅无论在稳定性还是在精确度上仍与世界先进水平相差甚远。为满足国内一台术中治疗加速器的研发需要,我们在传统多叶光栅控制基础上,利用可编程片上系统(System-on-aProgrammable-Chip,SOPC)技术对多叶光栅控制系统进行了软硬件重构,通过增加功能模块和改善电磁辐射防护等手段,研制了符合术中治疗加速器功能需求和机械安装尺寸的基于现场可编程门阵列(Field-Programmable Gate Array,FPGA)芯片的全新控制系统。经测试,该控制系统功能完善,双路位置反馈可靠性高,测试结果满足国家现行对于多叶光栅系统性能要求,为术中治疗加速器的研制提供了可靠保证。
Multi-lobe grating is one of the most important components of modern medical accelerators. The stability and accuracy of the control system directly affect the life safety of patients during surgery. However, at present, the multi-leaf grating in China is still far behind the world’s advanced level in terms of stability or precision. In order to meet the research and development needs of an intra-country therapeutic accelerator, based on the traditional multi-leaf grating control, the hardware and software of the multi-leaf grating control system are implemented by the programmable system-on-a programmable-chip (SOPC) By means of adding functional modules and improving the protection of electromagnetic radiation, a new control system based on Field-Programmable Gate Array (FPGA) chip which meets the functional requirements and mechanical installation dimensions of intra-operative therapeutic accelerator has been developed. After testing, the control system has perfect functions and high reliability of dual position feedback. The test results meet the current state of the art for multi-leaf grating system performance requirements, providing a reliable guarantee for the development of intraoperative therapeutic accelerator.