Novel X-ray multi-mode imaging method based on grating interferometer

Abstract

The invention discloses a novel X-ray multi-mode imaging method based on a grating interferometer, which is applied to an X-ray grating interferometer consisting of an X-ray source, a phase grating, an absorption analysis grating and a detector which are sequentially arranged along a Z-axis direction and aligned along the center of a Y-axis direction; X-rays emitted by the X-ray source enter the phase grating to be spatially modulated, and emergent X-rays penetrate through an imaged object, absorb the analysis grating and then enter the detector; intensity distribution of the spatially modulated X-rays is measured and recorded by a detector; light intensity distribution data recorded by the detector are processed by using a proposed signal calculation formula, and an absorption signal, a refraction signal and a dark field signal of an imaged object can be obtained. According to the method, a problem of quantitative and accurate extraction of the absorption signal, the refraction signal and the dark field signal of the imaged object when the stepping position of the absorption analysis grating does not meet the equidistant requirement can be solved.

Description

technical field [0001] The invention relates to the field of X-ray imaging, in particular to an X-ray multi-mode imaging method based on a grating interferometer. Background technique [0002] After nearly two decades of basic theoretical development and improvement and application exploration and research, the X-ray multi-mode imaging method based on grating interferometer has gradually developed into a powerful supplement to the existing X-ray imaging technology. According to the imaging principle, the absorption signal, refraction signal and dark field signal of the imaged object all contribute significantly to the light intensity distribution directly measured by the detector. Therefore, using a certain signal extraction formula, the absorption signal, refraction signal and dark field signal of the imaged object can be simultaneously obtained from a set of light intensity data measured by the detector. That is, X-ray grating interferometer imaging is a multi-mode imagin...

AI Technical Summary

Problems solved by technology

However, when the stepping position of the absorption analysis grating does not meet the expected equidistant requirements, the phase stepping method will fail, and the absorption signal, refraction signal, and dark field signal of the imaged object cannot be accurately obtained from the measured light intensity data.

This reduces the experimental efficiency of X-ray multi-mode imaging based on grating interferometer, and restricts the popularization and application of this multi-mode imaging method in clinical medical diagnosis and treatment, industrial non-destructive testing and other fields.

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