Dual-energy analysis grating

Abstract

The invention relates to a dual-energy analysis grating. The dual-energy analysis grating mainly comprises high-energy grate bars and low-energy grate bars. The high-energy grate bars can be used for converting high-energy X rays into visible light and screening low-energy X rays, and the low-energy grate bars can be used for converting the low-energy X rays into the visible light and screening the high-energy X rays. The grating is made from caesium iodide (CsI) and bismuth (Bi). According to the dual-energy analysis grating, the defects of the traditional analysis gratings are overcome, and the dual-energy analysis grating is used for converting the X rays of different energies instead of stepping; by applying the dual-energy analysis grating to a dual-energy imaging system, steps of imaging are reduced, the requirements on mechanical accuracy are lowered, and the imaging system is simplified.

Description

technical field [0001] The patent of the present invention relates to the field of X-ray imaging, and is an analysis grating applied to X-ray symmetry imaging systems. Background technique [0002] X-ray imaging technology is widely used in materials science, life science, industrial inspection and other fields, and is an indispensable and important tool for studying the internal structure of substances [1] . The interaction between X-rays and matter can be expressed by the complex refractive index, that is, n=1-α+iβ, where β is the absorption factor and α is the phase factor, which respectively represent the amplitude and phase changes of X-rays after passing through the object [2] . Traditional X-ray detection is based on the difference in the absorption of X-rays by substances, but substances composed of light elements such as C, H, O, and N have weak absorption of X-rays and cannot be effectively imaged. [3] . For matter composed of light elements, the change in X-ra...

AI Technical Summary

Problems solved by technology

The phase extraction algorithm of grating phase contrast imaging used the multi-step shift method in the early stage, and Chen Bo proposed the two-step phase shift method in 2008 [11] , in 2010 Liu Xin proposed a two-step arbitrary displacement method [12] , although the number of grating displacement steps is getting smaller and smaller, the imaging system still needs a precise stepping platform, which increases the complexity of the system. Multiple steps and exposures make the imaging efficiency low and incr...

Images