Coherent scattering-type X-ray detector with grating structure and detecting method

Abstract

The invention discloses a coherent scattering-type X-ray detector with a grating structure and a detecting method. The coherent scattering-type X-ray detector with a grating structure comprises a detector pixel array, and an absorption grating and a complementary grating for collecting X-ray coherent scattering photons at a fixed angle, wherein the absorption grating is arranged on the upper surface of the detector pixel array; the absorption grating has a grid-like structure formed by square solid units and square hollow units which are arranged in a vertical and horizontal staggered mode; ascintillation crystal is arranged in the absorption grating and located in each square hollow unit; the complementary grating is arranged between the absorption grating and a to-be-detected object, adistance exists between the complementary grating and the absorption grating, and the complementary grating has a matrix structure formed by strip solid units and strip hollow units which are arrangedin a vertical staggered mode. The X-ray scattering information with multiple energy components can be acquired through one exposure, more parameter information is provided for CT imaging, and an image obtained through reconstruction is more complete and accurate.

Description

technical field [0001] The invention relates to the field of X-ray detection by using a semiconductor detector, in particular to the detection and analysis of X-ray scattering information of medical coherent scattering CT (Computed Tomography, electronic computer tomography). Background technique [0002] Traditional medical CT (Computed Tomography, electronic computer tomography) detectors detect based on the average attenuation effect of X-rays, but have poor contrast for soft tissues with similar chemical element compositions. A large number of literatures show that when X-rays are transmitted through the human body, there will be three interactions between X-rays and human tissues: coherent scattering, incoherent scattering and photoelectric effect. When X-ray coherent scattering occurs, the X-ray photons collide with the electrons of the atoms, and the energy transmitted by the photons to the electrons during the collision is far less than the binding energy of the atom...

AI Technical Summary

Problems solved by technology

However, the Talbot / Talbot-Lau imaging system is based on the principle of X-ray interference, so it needs to carefully design the production of the grating and precise scanning control, so the obtained information includes the influence of noise, error and background signal, and cannot reliably and sensitively capture the corresponding Characterization of different tissues with different coherent scatter distributions

Current scattering-based imaging techniques are accomplished by collimator-assisted scanning. Coherent scattering systems collect scattering signals at characteristic angles to obtain 2D material maps point by point or line by line, but in practice due to the influence of the main flux photons, the capture is very small The angle of the scattered signal is not easy

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