| 闪光照相中散射分布均匀性的影响因素 |
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| 引用本文： | 刘军,张绚,刘进,施将君,刘瑞根,管永红,肖智强.闪光照相中散射分布均匀性的影响因素[J].强激光与粒子束,2009,21(3). |
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| 作者姓名： | 刘军 张绚 刘进 施将君 刘瑞根 管永红 肖智强 |
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| 作者单位： | 中国工程物理研究院 流体物理研究所， 四川 绵阳 621900 |
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| 基金项目： | 国防科技基础研究基金 |
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| 摘 要： | 为了在客体密度重建过程中采用迭代法扣除散射X射线的影响，提出了以散射分布均匀为主要目的的闪光照相系统设计思想。在介绍散射分布均匀性定义的基础上，分析了均匀扣除散射所带来的光程差。采用蒙特卡罗方法研究了系统放大倍数、照相距离以及后防护锥到图像接收系统的距离对散射分布均匀性的影响。结果表明：后防护锥到图像接收系统的距离是影响散射分布形状和散射照射量大小的一个主要因素；当后防护锥到图像接收系统的距离为55 cm左右时，散射分布均匀性近似最佳，而且照相距离越大，散射分布均匀性越好。这些研究结果可用于实际闪光照相系统的优化设计，在图像接收系统的响应范围内达到使散射分布均匀和降低光源模糊影响的目的。
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| 关 键 词： | 闪光照相 散射 均匀性 蒙特卡罗模拟 |
| 收稿时间： | 1900-01-01; |
Factors affecting scatter uniformity in flash X-ray radiography |
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| Liu Jun,Zhang Xuan,Liu Jin,Shi Jiangjun,Liu Ruigen,Guan Yonghong,Xiao Zhiqiang.Factors affecting scatter uniformity in flash X-ray radiography[J].High Power Laser and Particle Beams,2009,21(3). |
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| Authors: | Liu Jun Zhang Xuan Liu Jin Shi Jiangjun Liu Ruigen Guan Yonghong Xiao Zhiqiang |
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| Institution: | Institute of Fluid Physics， CAEP， P.O.Box 919-105, Mianyang 621900， China |
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| Abstract: | In order to eliminate the effect of scattered radiation in image reconstruction with the iterative method, it is necessary to design the layout and configuration of the high-energy flash X-ray radiography system with uniform scattering distribution. The definition of scattering uniformity is given and the optical path error produced by eliminating the effect of scattered radiation with average scattering exposure is analyzed. Various factors affecting the scattering uniformity are studied using Monte-Carlo method, including system magnification, radiographic distance and the distance between back protection cone and imaging plane. It is shown that a main factor affecting the scattering uniformity is the distance, which determines the shape of scattering distribution and scattering exposure |
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| Keywords: | scattering uniformity Monte-Carlo simulation |
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