| 同轴法射线相衬成像的数值模拟计算与分析 |
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| 引用本文： | 孙朝明,汤光平,王增勇.同轴法射线相衬成像的数值模拟计算与分析[J].强激光与粒子束,2015,27(6):064002. |
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| 作者姓名： | 孙朝明 汤光平 王增勇 |
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| 作者单位： | 1.中国工程物理研究院 机械制造工艺研究所, 四川 绵阳 621 900 |
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| 摘 要： | 对同轴法射线相衬成像进行数值模拟计算,可用于特定对象检测方法的可行性分析或检测参数优化。为此,分析了同轴法射线相衬成像系统数值模拟计算的原理及其实现方法,并针对圆形物体、长条形物体进行了相衬成像实验的数值模拟计算。对照计算结果进行分析可知:对物体平面进行离散化的尺寸很大程度上影响到数值模拟计算结果的准确程度,究其原因在于对物体平面进行离散化时决定了成像系统光学传递函数离散化的准确程度;为保证数值模拟结果的准确性,应使数值计算中光学传递函数取值点连续、不存在明显的失真;保证数值模拟结果准确所需的光学传递函数的离散化尺寸不是固定的,而是应与检测对象的大小相匹配。
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| 关 键 词： | 同轴法射线相衬成像 数值模拟 光学传递函数 离散化尺寸 |
| 收稿时间： | 2015-01-13 |
Numerical simulation and analysis for in line X-ray phase contrast imaging system |
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| Affiliation: | 1.Institute of Machinery Manufacturing Technology,CAEP,P.O.Box 919-624,Mianyang 621900,China |
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| Abstract: | Numerical simulation method could be used to investigate the possibility and effectiveness of phase contrast imaging for certain testing objects, moreover, to optimize imaging parameters. For X-ray in-line phase-contrast imaging system, principle of numerical simulation and the implementation method were analyzed first, and simulation for testing objects with round shape and strip shape were carried out afterward. After comparison of the simulation results, we know that the discretization size of testing object affects, to a large extent, the accuracy of numerical simulation results. The reason is that the accuracy of optical transform function (OTF) in the phase contrast imaging is determined by the discretization size of testing object. To guarantee the accuracy of simulation results, we should ensure no evident distortions exist in discretization of OTF and the discretization points are continuous. For an accurate simulation, the discrete size of OTF is not fixed, which should match the size of the testing object. |
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