双近贴式X射线像增强器成像不均匀性的分析与校正  

Analysis and Correction for Nonuniformity of the Two Side Proximity of X-ray Image Intensifier Radiography

作　　者：李伟[1,2] 赵宝升[1] 赵菲菲[1,2] 曹希斌[1,2] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119 [2]中国科学院研究生院,北京100049

出　　处：《光子学报》2009年第6期1353-1357,共5页Acta Photonica Sinica

基　　金：西安市科技创新支撑计划(ZH0713)资助

摘　　要：分析了双近贴式X射线像增强器响应不一致性的产生机理,对每个像元建立了光电响应的数学模型.基于该模型,提出了一种改进的多点校正算法.该算法将对数曲线模型转化为线性响应模型,通过基于最小二乘法的两点拟合算法对图像数据进行校正.对比分析了校正前后图像的背景标准差及灰度分布曲线,实验结果验证了该方法的有效性.By theoretical analysis of the cause for the two side proximity of X ray image intensifier response non-uniformity, a mathematics model of each pixel channel was set up and an improved multi-point correction algorithm was presented. The nonlinear response data was transformed to linear response by the proposed algorithm and the two-point algorithm based on least mean-square method was used to correct the image data. The standard deviations for images and the gray distributed curve were given before and after the correction. The non-uniformity correction capability of the presented solution was validated by experimental results.

关 键 词：射线成像 X射线像增强器 图像不均匀性 不一致性校正 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]