| 中子半影成像的两种非线性重建方法研究 |
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| 引用本文： | 余波,应阳君,许海波.中子半影成像的两种非线性重建方法研究[J].物理学报,2010,59(8):5351-5357. |
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| 作者姓名： | 余波 应阳君 许海波 |
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| 作者单位： | (1)北京应用物理与计算数学研究所,北京 100088; (2)中国工程物理研究院研究生部,北京 100088 |
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| 基金项目： | 中国工程物理研究院双百人才基金(批准号:42603)资助的课题. |
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| 摘 要： | 对图象重建的分子动力学方法进行了改进,使用能更快收敛的蛙跳格式,并添加规整化项以保持图像细节;同时还对图像重建的共轭梯度方法进行了分析,揭示了它与分子动力学方法的联系和区别;比较了两种方法的重建结果,分析了两种方法对于有噪声图像重建时的优缺点.
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| 关 键 词： | 中子半影成像 非线性重建 分子动力学方法 共轭梯度方法 |
| 收稿时间： | 2009-11-11 |
Two nonlinear reconstruction methods of neutron penumbral imaging |
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| Yu Bo,Ying Yang-Jun,Xu Hai-Bo.Two nonlinear reconstruction methods of neutron penumbral imaging[J].Acta Physica Sinica,2010,59(8):5351-5357. |
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| Authors: | Yu Bo Ying Yang-Jun Xu Hai-Bo |
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| Institution: | Graduate School, China Academy of Engineering Physics, Beijing 100088, China;Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;Institute of Applied Physics and Computational Mathematics, Beijing 100088, China |
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| Abstract: | Neutron penumbral imaging is an important diagnosis technique in laser-driven inertial confinement fusion experiment. In order to refine the resolution of 5 μm, it is necessary to develop nonlinear methods in reconstructing the detected imaging. In this paper, the authors improve the molecular dynamics method by using the Leap-frog format to increase convergence, and adding the edge-preserving regularization to suppress the edge-diffusion. Furthermore, the conjugate gradient method is also studied, and the relationship and differences between these two methods are revealed. Comparing the reconstruction results of the two methods, the advantages and disadvantages are analyzed for detecting images with noise. |
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| Keywords: | neutron penumbral imaging nonlinear reconstruction molecular dynamics method conjugate gradient method |
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