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| 双近贴式X射线像增强器成像不均匀性的分析与校正 | |
| 引用本文： | 李伟,赵宝升,赵菲菲,曹希斌. 双近贴式X射线像增强器成像不均匀性的分析与校正[J]. 光子学报, 2009, 38(6): 1353-1357 |
| 作者姓名： | 李伟 赵宝升 赵菲菲 曹希斌 |
| 作者单位： | 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;中国科学院研究生院,北京,100049 2. 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 |
| 基金项目： | 西安市科技创新支撑计划 |
| 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. |
| 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 |
| 收稿时间： | 2008-01-25 |
| 修稿时间： | 2008-03-26 |
Analysis and Correction for Nonuniformity of the Two Side Proximity of X-ray Image Intensifier Radiography |
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| LI Wei,ZHAO Bao-sheng,ZHAO Fei-fei,CAO Xi-bin. Analysis and Correction for Nonuniformity of the Two Side Proximity of X-ray Image Intensifier Radiography[J]. Acta Photonica Sinica, 2009, 38(6): 1353-1357 | |
| Authors: | LI Wei ZHAO Bao-sheng ZHAO Fei-fei CAO Xi-bin |
| Affiliation: | (1 State Key Laboratory of Transient Optics and Photonics,Xi′an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences,Xi′an 710119,China) (2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China) |
| Abstract: | 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. |
| Keywords: | Radiography X-ray image intensifier Image nonuniformity Nonuniformity correction |
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