X射线光栅相位成像的理论和方法

Theory and method of X-ray grating phase contrast imaging

通过对X射线光栅相位衬度成像实验装置的理论分析,提出了光栅位移曲线的表达式,推导出了X射线光栅相位衬度成像方程.根据该成像方程,提出了基于光栅成像相位提取方法.这些理论结果将简化光栅相位衬度成像实验步骤,提高信息获取效率,并为X射线光栅相位衬度成像和计算机断层成像的结合,进一步提出光栅相位衬度CT的简化理论奠定基础.

In this work, we make a theoretical analysis of X-ray grating phase contrast imaging （XGPCI） and give an equation to show the relationship between the transmittance and the relative shift of the two gratings, which was named as the shift curve. According to this equation, we develop a new method to retrieve phase information from the experimental data in theory. Finally, we analyze the influence of the experimental setup to the resolution of the image.