X 射线光栅微分相衬成像技术对由轻元素构成的物质的内部探测具有传统吸收成像无法比拟的优势,在材料领域、安检领域以及医疗领域具有广阔的应用前景。吸收光栅是系统中的关键光学器件，其制作难度大、成本高，并且吸收光栅不能完全吸收高能X 射线而导致图像衬度和检测灵敏度下降，限制了该技术的发展应用。针对上述问题，基于自主研制的低成本铋材料源光栅和能够克服高能X 射线限制的具有分析光栅功能的结构化转换屏，提出了低成本、高效率的X 射线光栅微分相衬成像方法，在实验上获得了高质量的相衬图像。

Grating-based X-ray differential phase contrast imaging has great advantages of detecting the low- Z materials compared with conventional X- ray absorption imaging. It has potential applications in the field of materials, security and medical diagnostics. The fabrication process of absorption grating which is a critical optical component in the system is difficult and costly, and the absorption grating cannot completely absorb high- energy X- rays that results in the decrease of image contrast and detection sensitivity, which has been a great obstacle for the practical application. In view of above problems, a low cost and high efficiency approach based on Bi-source grating and structured scintillator is proposed. The scintillator overcomes the limitation of high- energy X- rays and proposes the function of analyzer grating. This approach obtains high quality phase contrast image experimentally.