Collimation technology research based on French Test Object
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摘要: 通过研究法国实验客体（FTO）的闪光照相过程, 设计了静态照相过程中采用的准直措施, 除传统的一二级准直体外, 还通过添加三级准直体来进一步控制入射到客体边缘部分的X射线, 从而降低散射的影响。蒙特卡罗方法模拟结果表明, 采用三级准直技术可以有效地控制散射的影响, 图像接收平面各边界的直散比有了明显的提升。Abstract: The flash X-ray radiography of the French Test Object (FTO) was studied and a 3-grade collimating system was designed to reduce the generation of scattered background. Except for the traditional 2-grade collimating system, we adopted a third collimator to further control the scattered background. Monte-Carlo simulations suggest that the 3-grade collimating system can effectively control the influence of scattering. The direct-exposure scattered-exposure ratio along each border between different materials can be greatly improved in the accepting plane.
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