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首页> 外文期刊>Applied optics >Limitations imposed by specimen phase gradients on the design of grating based x-ray phase contrast imaging systems
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Limitations imposed by specimen phase gradients on the design of grating based x-ray phase contrast imaging systems

机译：样品相梯度对基于光栅的X射线相衬成像系统设计的限制

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摘要

X-ray phase contrast imaging is a very promising technique that may lead to significant advancements in a variety of fields, perhaps most notably, medical imaging. The radiation physics group at University College London is currently developing an x-ray phase contrast imaging technique that works with laboratory x-ray sources. This system essentially measures the degree to which photons are refracted by regions of an imaged object. The amount of refraction that may be expected to be encountered in practice impacts strongly upon the design of the imaging system. In this paper, we derive an approximate expression between the properties of archetypal imaged objects encountered in practice and the resulting distribution of refracted photons. This is used to derive constraints governing the design of the system.
机译：X射线相衬成像是一种非常有前途的技术，可能会导致在各个领域取得重大进展，也许最值得注意的是医学成像。伦敦大学学院的辐射物理学小组目前正在开发一种可与实验室X射线源配合使用的X射线相衬成像技术。该系统实质上测量了光子被成像对象区域折射的程度。在实践中可能会遇到的折射量强烈影响成像系统的设计。在本文中，我们推导了在实践中遇到的原型成像对象的属性与折射光子的分布之间的近似表达式。这用于导出控制系统设计的约束。

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