三维任意几何光子成像系统的散射修正及图像重建方法  

Scattering Correction and Image Reconstruction for Arbitrary 3D Geometry in Flash Radiography

作　　者：王梦琪[1] 曹良志[1] 吴宏春[1] 程玉雄[1] 刘宙宇[1] 张宏博[1] 

机构地区：[1]西安交通大学核科学与技术学院,西安710049

出　　处：《西安交通大学学报》2012年第11期86-90,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金-中国工程物理研究院联合基金资助项目(10976021)

摘　　要：在客体材料密度重建过程中考虑散射光子的影响,研究了在重建过程中通过迭代扣除散射贡献进行散射修正的重建方法.针对三维任意几何结构问题,利用AutoCAD的二次开发功能实现几何前处理,开发了用于散射量计算的快速光子输运计算程序及基于三维任意几何结构的迭代法图像重建程序(IPOR).通过与蒙特卡罗程序MCNP进行数值比较,可知文中采用的散射修正方法在达到与蒙特卡罗方法相当精度的同时,其计算效率可提高2个数量级.重建计算结果表明,IPOR的重建精度远高于未进行散射修正的直接求解法的重建精度.The effect of the scattered photons was taken into account and the iterative deduction of the scattered photons was used to amend the scattering effect in the image restoration.The customization of AutoCAD was performed to achieve the three-dimensional arbitrary geometry pretreatment.On the basis of the model,IPOR（Iterative Procedure for image restORation code） was developed.Comparison of the results of IPOR code with those of MCNP shows that the scattering correction method of IPOR outperforms the MC method in terms of much less computing time by more than two orders of magnitude with comparable precision.Furthermore,IPOR code has a very high computational efficiency,and it is more accurate compared with the direct solution without scattering correction.

关 键 词：光子成像 任意几何结构 散射修正 图像重建 

分 类 号：TL81[核科学技术—核技术及应用]