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X射线光栅成像技术可以利用传统X射线机在一次成像中同时获取被检测体的衰减、相衬与暗场信息。介绍了当前X射线光栅成像的基本原理与系统结构,分析了同一成像传感器在同一时空场景下获取的三种信息的各自特性以及相互之间的影响与相关特性,利用基于小波变换的图像融合方法对衰减、相衬与暗场信息进行融合。对Pfeiffer等的原始实验数据的仿真验证表明:合理的图像融合技术可以实现对同时包含有多种轻、重元素物质在内的大动态范围高分辨率一次性单图成像检测。
X-ray grating imaging technology can use the traditional X-ray machine in a single imaging at the same time to obtain the body attenuation, phase contrast and dark field information. The basic principle and system structure of the current X-ray grating imaging are introduced. The characteristics of the three kinds of information acquired by the same imaging sensor in the same space-time scene are analyzed and their mutual influence and correlation characteristics are analyzed. The image fusion method based on wavelet transform Fusion of attenuation, phase contrast and dark field information. The simulation results of Pfeiffer and other original experimental data show that the reasonable image fusion technology can realize the high-resolution one-time single-image detection of large dynamic range including multiple light and heavy elements simultaneously.