硬X射线光栅微分干涉相衬成像两步相移算法的理论与实验研究

Theoretical and experimental study of two-phase-stepping approach for hard X-ray differential phase contrast imaging

针对硬X射线光栅微分干涉相衬成像在实际应用中对低辐射剂量和快速获取图像的要求,通过对实验系统的理论分析和参数优化设计,采用了两步相移算法用于提取物体相位信息.这种方法可以有效降低X射线对物体的辐射剂量,大大提高恢复相位信息的速度,为X射线光栅相衬成像在未来的医疗和工业中的应用奠定基础.

To satisfy the need of low-dose and high-speed in practical application of hard X-ray differential phase contrast imaging, according to the theoretical analysis and the optimal design of parameters for the experimental system, we propose a two-stepping phase shift algorithm to retrieve the object phase information. The method can effectively reduce the radiation dose and substantially improve the speed of retrieving phase information, which lays the foundation for the X-ray phase contrast imaging in medical and industrial applications.