X-ray grating imaging system and imaging method

Abstract

The invention relates to an X-ray grating imaging system and an imaging method. The system comprises a distributed X-ray source, a fixed grating module, and an X-ray detector; the distributed X-ray source is perpendicular to the propagation direction of X-rays and is distributed along a direction parallel to grating stripes; the fixed grating module is arranged along the propagation direction of the X-rays and comprises a first grating and a second grating; the first grating and the second grating are parallel to each other; and the positions of the first grating and the second grating are fixed relative to each other. Light intensity at each pixel point at the presence or absence of a scanned object can be obtained on the basis of a set of stepping exposure process of the distributed X-ray source, so that one or more kinds of information selected from the attenuation, phase contrast and dark field information of each pixel point can be obtained on the basis of light intensity change,so that an image can be reconstructed. The X-ray grating imaging system and the imaging method have the advantages of high system stability, short scanning time, low ray dose and clear imaging.

Description

technical field [0001] The disclosure belongs to the technical field of X-ray imaging, and relates to an X-ray grating imaging system and an imaging method. Background technique [0002] In the prior art, X-ray scanning and imaging of objects has been widely used, such as CT scanning equipment, security inspection, X-ray machine, application in material flaw detection, and the like. Traditional X-ray scanning imaging generally uses the X-ray attenuation characteristics of the measured material to inspect the internal structure of the object in a non-destructive manner. The more obvious the difference in the density of the constituent structures of the various parts inside the object, the more significant the effect of traditional X-ray imaging techniques. However, substances made of light elements are weak absorbers for X-rays, so their internal structures can hardly be seen with conventional X-ray imaging techniques. Even if other auxiliary means are used, such as applyin...

AI Technical Summary

Problems solved by technology

Data collection process is inefficient and cumbersome

Some use the change of light source and grating to replace the stepping process, which brings new technical problems while solving the stepping problem, such as: blurring the image or reducing the image resolution in the Z direction due to the widening of the light source and position offset It is difficult to improve the overall performance of the X-ray imaging system due to problems such as high efficiency, high requirements for mechanical control, and long scanning time.

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