| 基于空间解析几何关系的焦点投影位置测量 |
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| 引用本文： | 李斌,傅健,周正干.基于空间解析几何关系的焦点投影位置测量[J].北京航空航天大学学报,2011,37(4):458-461. |
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| 作者姓名： | 李斌 傅健 周正干 |
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| 作者单位： | 北京航空航天大学 机械工程及自动化学院, 北京 100191 |
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| 基金项目： | 国家自然科学基金资助项目，北京市自然科学基金资助项目，北京市科技新星计划资助项目 |
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| 摘 要： | 为了抑制工业计算机层析成像(CT,Computed Tomography)过程中的重建伪影,研究了一种基于空间解析几何关系的射线源焦点投影位置测量方法,并完成了计算机仿真和实验验证.该方法根据工业CT扫描系统的几何结构关系建立射线源焦点投影位置和转台旋转中心投影位置之间的空间解析表达式,然后通过测量转台旋转中心在多个位置的投影来解析求解射线源焦点投影位置.该方法要求转台具有3个自由度:旋转,平行于探测器方向移动,和垂直于探测器方向移动.仿真和实验结果表明,该方法能够有效抑制重建伪影.该方法无需使用特殊模体,不需要任何先验几何参数,较现有方法更为方便.
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| 关 键 词： | 层析成像 无损检测 二维 测量 像质 最小二乘法 |
| 收稿时间： | 2010-05-15 |
Method for measuring projection position of focal point based on space geometrical relations |
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| Li Bin,Fu Jian,Zhou Zhenggan.Method for measuring projection position of focal point based on space geometrical relations[J].Journal of Beijing University of Aeronautics and Astronautics,2011,37(4):458-461. |
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| Authors: | Li Bin Fu Jian Zhou Zhenggan |
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| Institution: | School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| Abstract: | In order to reduce artifacts on industrial computed tomography(CT) images,one method for measuring the projection position of the focal point based on space geometrical relations was put forward.Computer simulations and experiments were carried out.The method established analytic equations between the projection position of the focal point and the projection position of the center of rotation.The projection position of the focal point was calculated through several times calculation of the center of rotatio... |
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| Keywords: | computerized tomography nondestructive examination two dimensional measurements image quality least squares approximations |
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