Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan.
Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima-shi, Tokyo, 196-8666, Japan.
Sci Rep. 2017 Jul 27;7(1):6711. doi: 10.1038/s41598-017-07032-y.
An X-ray Talbot-Lau interferometer scanning setup consisting of three transmission gratings, a laboratory-based X-ray source that emits X-rays vertically, and an image detector on the top has been developed for the application of X-ray phase imaging to moving objects that cannot be tested clearly with conventional absorption contrast. The grating-based X-ray phase imaging method usually employs a phase-stepping (or fringe-scanning) technique by displacing one of the gratings step-by-step while the object stays still. Since this approach is not compatible with a scanner-type application for moving objects, we have developed a new algorithm for achieving the function of phase-stepping without grating displacement. By analyzing the movie of the moiré pattern as the object moves across the field of view, we obtain the absorption, differential phase, and visibility images. The feasibility of the X-ray phase imaging scanner has been successfully demonstrated for a long sample moving at 5 mm/s. This achievement is a breakthrough for the practical industrial application of X-ray phase imaging for screening objects carried on belt-conveyers such as those in factories.
我们开发了一种用于 X 射线相衬成像的 X 射线泰伯-劳（Talbot-Lau）干涉仪扫描装置，它由三个透射光栅、一个垂直发射 X 射线的基于实验室的 X 射线源和一个位于顶部的图像探测器组成，可用于对无法用传统吸收衬度清晰测试的运动物体进行 X 射线相衬成像。基于光栅的 X 射线相衬成像方法通常采用相位步进（或条纹扫描）技术，在物体静止的情况下逐步移动一个光栅。由于这种方法与用于运动物体的扫描仪类型应用不兼容，因此我们开发了一种新的算法，无需光栅移动即可实现相位步进的功能。通过分析物体穿过视场时的莫尔图案的电影，我们获得了吸收、差分相位和可见度图像。该 X 射线相衬成像扫描仪已成功用于以 5mm/s 的速度移动的长样本，这是 X 射线相衬成像在工厂等输送带输送的物体的实际工业应用方面的突破。
