Imaging method for a single-exposure hard X-ray grating interferometer

Abstract

The invention discloses an imaging method of a hard X-ray grating interferometer with single exposure. The imaging method is characterized by including the steps of 1, moving any grating, and fixing a working point of the hard X-ray grating interferometer at a left half waist and right half waist position of a light intensity curve; 2, obtaining a background projection image and a projection image of an imaged object respectively; 3, obtaining the normalized projection image of the imaged object, and conducting logarithm process on the normalized projection image; 4, constructing an expression formula to conduct one-dimensional Fourier transform according to the logarithm process result; 5, utilizing one-dimensional inverse Fourier transform to extract absorption of the imaged object and a relative phase shift signal respectively according to the result of the Fourier transform. According to the imaging method of the hard X-ray grating interferometer with the single exposure, the data collection procedure of the hard X-ray grating interferometer is simplified, the imaged object is subjected to single exposure, the imaging efficiency is improved, the radiation damage risk is reduced, and thus a new path of the development of a future fast and low-radiation-dose clinical medical imaging technology is provided.

Description

technical field [0001] The invention relates to the field of hard X-ray imaging physics and methods, in particular to an imaging method of a single-exposure hard X-ray grating interferometer. Background technique [0002] Over the past 100 years, X-ray imaging methods and technologies have continuously made new progress in imaging physical mechanisms, data acquisition schemes, and tomographic reconstruction algorithms. At present, they have developed into materials science, clinical medicine, archaeological science, public security and other fields. Indispensable and important tool. Especially in the field of clinical medicine, X-ray imaging methods and devices, including X-ray projection imaging (X-ray Radiography) and X-ray computed tomography (X-ray Computed Tomography), have made great contributions to modern human health and social development. irreplaceable major contribution. [0003] From the point of view of the physical mechanism of imaging, the existing X-ray im...

AI Technical Summary

Problems solved by technology

This method requires a complex horizontal step-scanning grating, which leads to a long data acquisition time and reduces the experimental efficiency; it requires the collection of multiple object projection images (not less than 4 in the experiment), which increases the radiation dose and radiation of the object. risk of injury

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

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