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中文摘要：
应用Geant4系统对中子针孔成像的点扩展函数进行了模拟研究．建立了点扩展函数的数学模型，并将其分布图像与能量沉积数据的分布图像作了比较，可看出点扩展函数与能量沉积数据吻合得较好．研究结果表明，在一定偏移量范围内，拟合得到的点扩展函数更好，能得到较好的图像分辨率．通过对不同入射能量在一定偏移量入射下的点扩展函数讨论认为，入射能量增大虽然会增强图像的对比度，但会降低分辨率．
英文摘要：
The point spread function （PSF） of neutron pinhole imaging was simulated and analyzed based on the Geant4 system and a model in theory was established. By the comparison between the distributed image of PSF and that of energy deposition data, it is known that both data agree with each other well. The results show that the better image resolution can be obtained through the corresponding PSF in a certain incident range. By the discussion on the PSFs of different incident energies in the same position, it is shown that increasing the incident energy can enhance the image contrast, but reduce the resolution.
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