X-ray source for X-ray raster differential phase-contrast imaging

Abstract

The invention discloses an X-ray source for X-ray raster differential phase-contrast imaging. The X-ray source comprises an annular cathode, an anode target, an electrode structure, a cathode heating power supply and an electrode structured power supply, wherein the annular cathode and the target surface of the anode target are arranged oppositely; an X-ray emitting window, which corresponds to the central position of the annular cathode and is parallel to the target surface of the anode target, is arranged at the back of the annular cathode; the target surface of the anode target is perpendicular to the optical axis of emitted X-rays; the electrode structure comprises a cathode sleeve and an anode sleeve; the anode target is arranged in the anode sleeve; the annular cathode is arranged in the cathode sleeve; an array structure formed by two different materials, which are alternated periodically, is arranged on the target surface of the anode target; the two different materials adopt two substances formed by two elements with large atomic number difference. The novel X-ray source has a relatively simple structure and is applied to high-energy X-ray phase-contrast imaging; the problem that the field of view is limited is thoroughly solved because the emitted X-rays are not distributed in the axial direction.

Description

technical field [0001] The invention belongs to the technical field of X-ray imaging, and relates to an X-ray source, in particular to an X-ray source for large-field X-ray phase-contrast imaging. Background technique [0002] X-ray imaging technology is widely used in medicine, life science, material science and industrial non-destructive detection and other fields. Traditional X-ray imaging technology is based on the absorption and attenuation characteristics of the object to X-rays. It requires that the difference in the absorption attenuation coefficient between the object and the surrounding environment and different components in the object is relatively obvious. The imaging effect is remarkable when detecting objects made of heavy elements such as metals, such as bone imaging in medical imaging, metal detection in industrial inspection, etc. For materials based on light elements (carbon, hydrogen, oxygen, etc.) and biological soft tissues such as blood vessels and ar...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention lies in that, in the existing array X-ray source adopting absorption grating mode, the defect that the absorption grating manufacturing process is difficult and the cost is high, and the X-ray source adopting an array structure anode target is affected by the imaging field of view. To overcome the defects that are difficult to apply to large-field phase-contrast imaging, a new type of X-ray source that is relatively simple in structure, simple in manufacturing process, and low in cost for high-energy X-ray phase-contrast imaging is provided. Since the outgoing X-rays have no axial distribution Completely solve the problem of limited field of view

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