X射线背散射成像系统点扫描器设计

Design of Point Scanner used in X-ray Backscatter Imaging System

提出一种用于X射线背散射成像系统的新型跳点扫描器结构,描述了跳点设计原理,解释了孔对结构、计算了铜铅合金Cu Pb30材料的旋转内筒对噪声射线的屏蔽性能。在单射线源背散射/透射成像实验平台上获取了背散射与透射图像,验证了跳点扫描器的功能。分析了跳点扫描器带来的行不均匀性和锯齿效应以及图像分辨率和信号噪声比低的问题,进一步提出改进的跳线飞点扫描器设计方案。

This paper describes a new type hopped point scanner of X -ray backscatter imaging system. And there are some explanations about the principle of hopped point scanning and holes pair structure, and transmis- sion rate of noise X - ray through the rotating cylinder is calculated which is made of CuPb30 alloy material. As a result, a test platform is made up which uses hopped point seanner, and the back scattering and transmission images are obtained, which verify the scanner＇s funetions. Analysis on the line inhomogeneity, the saw tooth effect and low SNR are explained, which caused by hopped point scanning. Finally, an improved approach is proposed that called hopped line flying point seanning.