Single-exposure multi-mode X-ray imaging method based on three-detector grating interferometer

Abstract

The invention discloses a single-exposure multi-mode X-ray imaging method based on a three-detector grating interferometer. An X-ray source, a phase grating, a first detector and a second detector are sequentially arranged along the Z axis. A three-detector grating interferometer formed with the third detector; and centered along the Y axis; wherein, the working point of the first detector is fixed at the peak of the light intensity curve; the working point of the second detector is fixed At the waist of the light intensity curve; the working point of the third detector is fixed at the valley of the light intensity curve; thereby using the images acquired by the first detector, the second detector and the third detector to extract the absorption of the imaged object , refraction and dark field signals. The invention can solve the problem of accurate extraction of the refraction signal and the dark field signal of the imaged object under low photon counting, thereby providing a new way for the development of fast, accurate and low radiation dose multi-mode X-ray imaging technology.

Description

technical field [0001] The invention relates to the field of X-ray imaging methods, in particular to a single-exposure multi-mode X-ray imaging method based on a three-detector grating interferometer. Background technique [0002] In recent years, as a powerful supplement to traditional X-ray absorption imaging technology, X-ray refraction imaging and dark-field imaging methods have been developed rapidly, and their potential application value in clinical medical diagnosis and treatment, public security inspection and other fields has attracted increasing attention . In particular, the multi-mode X-ray imaging based on the grating interferometer can simultaneously obtain the absorption, refraction and dark field signals of the imaged object from a set of experimental data. The three different signals complement each other and can simultaneously reflect the difference in mass density and charge density of the imaged object, as well as the spatial distribution information of ...

AI Technical Summary

Problems solved by technology

The phase step method requires: complex step scanning of the phase grating, resulting in a long data acquisition time, which reduces the experimental efficiency; multiple exposures to the imaged object, acquisition of multiple projection images of the imaged object (actual experiment At least 4 of them), increasing the radiation dose of the object being imaged and the risk of radiation damage

More importantly, in the case of low photon counting, that is, low radiation dose, the phase stepping method cannot accurately extract the refraction signal and dark field signal of the imaged object

These limitations hinder the popularization and application of X-ray grating interferometer in clinical medical diagnosis, dynamic imaging and other fields

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