| 一种锥束CT中平板探测器输出图像校正方法 |
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| 引用本文： | 王苦愚,张定华,黄魁东,李明君.一种锥束CT中平板探测器输出图像校正方法[J].计算机辅助设计与图形学学报,2009,21(7). |
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| 作者姓名： | 王苦愚 张定华 黄魁东 李明君 |
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| 作者单位： | 西北工业大学现代设计与集成制造技术教育部重点实验室,西安,710072 |
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| 基金项目： | 国家科技支撑计划重点项目，教育部高等学校博士学科点专项科研基金，西北工业大学研究生创业种子基金 |
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| 摘 要： | 为了消除平板探测器缺陷在锥束CT重建切片中引起的伪影,提出一种投影图像校正方法.通过对投影图像进行暗场和增益不一致校正,推导了像元增益系数公式;对增益系数以及像元输出的期望和方差进行直方图分析以识别坏像素,根据坏像素分布特征设计相应的插补方案;通过局部屏蔽区域数据统计暗场波动幅度并逐行修正.实验结果表明,该方法使投影图像灰度分布均匀,像元输出波动和切片伪影得到有效抑制.
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| 关 键 词： | 锥束CT 平板探测器 投影校正 增益系数 暗场不稳定 |
A Calibrating Method of Flat Panel Detector Based on Cone Beam Computed Tomography |
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| Wang Kuyu,Zhang Dinghua,Huang Kuidong,Li Mingjun.A Calibrating Method of Flat Panel Detector Based on Cone Beam Computed Tomography[J].Journal of Computer-Aided Design & Computer Graphics,2009,21(7). |
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| Authors: | Wang Kuyu Zhang Dinghua Huang Kuidong Li Mingjun |
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| Affiliation: | Key Laboratory of Contemporary Design and Integrated Manufacturing Technology;Ministry of Education;Northwestern Polytechnical University;Xi'an 710072 |
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| Abstract: | To eliminate reconstructive slice artifacts of cone beam CT caused by defects in flat panel detector,a calibration method is proposed for projected images.On the basis of dark image and gain non-uniformity calibration,the gain coefficient is derived and bad pixels are identified based on a histogram analysis of gain coefficient,mathematical expectation together with variance of output.Then an appropriate interpolation method is designed according to the distribution of bad pixels.For calibrating the unstabl... |
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| Keywords: | cone beam CT flat panel detector projected image calibration gain coefficient dark current fluctuation |
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