Penumbral imaging and numerical evaluation of large area source neutron imaging system
Penumbral imaging and numerical evaluation of large area source neutron imaging system
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DOI：
10.1007/s11431-009-0249-3
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
Yue-lei Wu;Huasi Hu;Boping Zhang;Linbo Li;Da Chen;Q. Shan;Jie Zhu
中科院分区：
文献类型：
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作者：
Yue-lei Wu;Huasi Hu;Boping Zhang;Linbo Li;Da Chen;Q. Shan;Jie Zhu
建立了聚变中子半影成像系统的蒙特卡罗模型。在几何近光学成像和真实的成像两种情况下，得到了中子源中两个离散单元的传递函数。对两种情况下成像系统的空间分辨率进行了评价和比较。通过二维卷积和蒙特卡罗模拟得到了源中4个单元的半影图像。半影图像采用同样的滤波方法重建。同样的结果得到了证实。揭示了半影成像的编码本质。采用MCNP（MonteCarlo N-particle）模拟方法，获得了大面积源（200 μm×200 μm）在闪烁光纤阵列上的中子半影图像。采用改进的维纳滤波方法对半影图像进行重建，得到源图像。计算结果与预先设定的中子源图像一致。验证了中子成像系统的可行性。
The fusion neutron penumbral imaging system Monte Carlo model was established. The transfer functions of the two discrete units in the neutron source were obtained in two situations: Imaging in geometrical near-optical and real situation. The spatial resolutions of the imaging system in two situations were evaluated and compared. The penumbral images of four units in the source were obtained by means of 2-dimensional (2D) convolution and Monte Carlo simulation. The penumbral images were reconstructed with the same method of filter. The same results were confirmed. The encoding essence of penumbral imaging was revealed. With MCNP(Monte Carlo N-particle) simulation, the neutron penumbral images of the large area source (200 μm×200 μm) on scintillation fiber array were obtained. The improved Wiener filter method was used to reconstruct the penumbral image and the source image was obtained. The results agree with the preset neutron source image. The feasibility of the neutron imaging system was verified.