信号干扰VitalBeam加速器托盘旋转变压器的案例与思考

The case and thinking for signal interference in resolver of carousel on Varian VitalBeam medical linear accelerator

本文介绍一例随机信号干扰瓦里安VitalBeam医用直线加速器旋转托盘内的旋转变压器(或称编码器)的案例。本案例被瓦里安的中国、欧洲和美国技术专家认为是该技术平台(包括TrueBeam)的罕见故障。本文对比分析了VitalBeam与传统加速器的旋转托盘在结构与控制系统方面存在的差异,以便让同行对旋转变压器有更深刻的认识,同时总结了解决故障的逻辑与方法,为分析相关问题提供借鉴经验。本研究发现了联锁系统的不完善,可为瓦里安公司优化系统提供事实与技术依据。

In this article,a case for random signal interference in resolver(or encoder)of carousel on Varian VitalBeam medical linear accelerator was illustrated.This case was considered as a rare failure of the technology platform(including TrueBeam)by Chinese,European and American technical experts in Varian.In this article,the differences of the carousel in the structure and control system between VitalBeam and traditional accelerator were comparatively analyzed to enable the peers to have a deeper understanding of resolver.The logic and methods to solve the fault were summarized,providing reference experience for analyzing the problems related to carousel.It is found that the interlocking system is imperfect,which provides a factual and technological basis for Varian to optimize the system.