一种新的加速器EPID机械精度的高精准测量方法及其实现

A Novel Method for Accurately Detecting Mechanical Precision of Accelerator Electronic Portal Imaging Device and Its Implementation

目的设计并实现了一种电子射野影像装置(Electronic Portal Imaging Device,EPID)机械精度的精确检测方法,可对EPID各机械参数进行测量和定量分析。方法系统硬件采用双目红外相机和定位小球,双目相机以20 Hz频率输出小球的空间坐标,根据小球坐标实时计算EPID平板角度和影像等中心位置以及位置偏差,实现对EPID的精确检测。结果本方法在某医院的EPID上进行多次试验和分析,得到机械等中心与影像等中心误差、EPID平板角度等数据。结论本方法操作简单,具有较高的重复性,可有效帮助技术人员进行机器日常维护工作,对EPID的日常检测和质量控制有指导意义。

Objective To design and implement a mechanical precision detect method that can measure and quantify the mechanical parameters of electronic portal imaging device(EPID).Methods The hardware part of the system used the infrared binocular camera and positioning points.The infrared binocular camera outputted the spatial coordinates of the positioning points at a frequency of 20 Hz.According to the coordinates of the positioning points,the software calculated the flat angle,mechanical isocenter and image isocenter of EPID in real time,then realized the detection of mechanical precision of EPID.Results Using this method,multiple tests and analyses were performed on EPID of a hospital,and mechanical isocentric error and image isocentric error,EPID plate Angle were obtained.Conclusion This method is simple to operate and has high repeatability,which can effectively help technicians to carry out daily maintenance work of the machine,and has guiding significance for daily detection and quality control of EPID.