| 一种用于CT空间分辨率增强的图像重建方法 |
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| 引用本文： | 傅健,谭忍泊,赵峰.一种用于CT空间分辨率增强的图像重建方法[J].航空动力学报,2013,28(5):971-976. |
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| 作者姓名： | 傅健 谭忍泊 赵峰 |
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| 作者单位： | 1. 北京航空航天大学机械工程及自动化学院数字辐射成像与生物医学成像实验室,北京,100191
2. 内蒙古红峡化工厂,呼和浩特,010010 |
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| 基金项目： | 国家自然科学基金(11179009, 50875013); 北京市自然科学基金(4102036); 北京市科技新星计划(2009A09) |
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| 摘 要： | 为在既有硬件条件下提高工业计算机层析成像(computed tomography,CT)系统空间分辨率,分析了提高采样频率的半像素错位工业CT扫描方法,提出了一种基于代数迭代技术的直接重建算法,以面积权值对采集到的投影数据进行交替迭代,实现高分辨率图像重建.利用星型空间分辨率模型开展了计算机仿真分析,重建图像截止频率处的调制度达到0.8,表明了该方法提高空间分辨率的潜力.标准空间分辨率测试卡工业CT扫描重建实验结果进一步验证了其可行性和有效性.该方法简单、易行,在工业CT系统中有良好工程应用前景.
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| 关 键 词： | 工业计算机层析成像 空间分辨率 半像素错位扫描 重建算法 代数迭代重建 |
| 收稿时间： | 2012/5/28 0:00:00 |
An image reconstruction method for improving CT spatial resolution |
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| FU Jian,TAN Ren-bo and ZHAO Feng.An image reconstruction method for improving CT spatial resolution[J].Journal of Aerospace Power,2013,28(5):971-976. |
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| Authors: | FU Jian TAN Ren-bo and ZHAO Feng |
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| Institution: | Digital Radiation Imaging and Biomeidcal Imaging Laboratory, School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;Digital Radiation Imaging and Biomeidcal Imaging Laboratory, School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;Hongxia Chemical Plant in Inner Mongolia, Hohhot 010010, China |
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| Abstract: | In order to improve the spatial resolution of industrial computed tomography (CT) without changing the hardware,the half-pixel offset scanning mode was analyzed and a direct reconstruction algorithm,which was based on the algebraic iteration technique,was proposed.This algorithm adopted area-weight to execute directly the iterative update of the reconstructed value using the acquired projection data.Computer simulation analysis with a star-type spatial resolution phantom was implemented and a modulation of 0.8 was reached at the cut-off frequency.It demonstrates that the proposed method has the potential of improving the spatial resolution.The industrial CT experimental results of a standard spatial resolution phantom validate the feasibility and the effect of the method.The proposed approach is easy to implement and has a promising application future. |
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| Keywords: | industrial computed tomography spatial resolution half-pixel offset scanning reconstruction algorithm algebraic iteration reconstruction |
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