X射线同轴相衬成像的参数优化系统

通过对具有2维高斯型相位分布特征的物体的X射线同轴相衬成像技术进行理论分析，建立了成像系统参数优化系统。优化系统明确了图像衬度、信噪比、分辨力和探测器抽样数等成像质量评价参数对射线源能量、源焦斑尺寸、探测器分辨力、成像几何和物体结构特性等系统参数的依赖关系。采用数值模拟,分别对亚微焦点源、激光驱动微焦点源和同步辐射源3种X射线源下的成像系统相关参数进行了优化。结果表明，优化系统很好地完成了系统的优化工作。

Parameter optimization system for X-ray in-line phase contrast imaging

A parameter optimization system is established for X-ray in-line phase contrast imaging of the object of two dimensional Gaussian distribution based on the theoretical analysis of the imaging technology. The dependence of the evaluation parameters including contrast, signal-to-noise ratio, resolution and sampling on the systematic parameters including X-ray energy, source size, detector resolution, imaging geometry and sample properties is clarified. The systematic parameters of the imaging systems under the irradiation of sub-micron focus X-ray source, laser-driven micro-focus X-ray source and synchrotron radiation X-ray source are optimized, respectively, by the means of numerical simulation. The outcome shows that the optimization system completes the optimization task very well.