One-time exposure grating interferometer apparatus and data collection and information extraction method

Abstract

The invention discloses a one-time exposure grating interferometer apparatus and a data collection and information extraction method. The data collection and information extraction method comprises that S21, a light source and a phase grating are adjusted, such that a parallel X-ray beam is perpendicularly incident; S22, a sample rotation table is vacant, the phase grating translates step by step along a direction parallel to the X-ray beam and perpendicular to the grid, and the light intensity values of the phase grating are collected and stored after each step of the translating; S23, an angle signal response function is determined according to the collected light intensity values after each step of the translating; S24, a high-resolution detector is adjusted to make detection units be aligned to the grids; S25, a sample is placed, and the light intensity value of the sample is collected and stored; S26, according to various sample unit light intensity values collected by various detection units, sample projection images are respectively combined at a phase grating displacement of 0, P/4, P/2, and 3P/4; and S27, according to the angle signal response function of the phase grating and the four sample projection images, sample information is extracted. According to the present invention, the analysis grating is not required to be used, and the four projection images can be combined through the one-time exposure collection.

Description

technical field [0001] The present application relates to the technical field of X-ray imaging, in particular to a single-exposure grating shearing imaging device and a data collection and information extraction method. Background technique [0002] Grating Interferometer (GI for short) is a phase contrast imaging method developed in recent years. For samples composed of light elements (such as soft tissue, etc.), GI can provide much larger "phase" contrast information than traditional "absorption" contrast; and GI methods can be combined with ordinary X-ray light sources for imaging, which is expected to achieve clinical applications , so it has broad development prospects. [0003] figure 1 It is a schematic structural diagram of a typical grating shear imaging device in the prior art. Such as figure 1 As shown, the current general-purpose GI device sequentially includes an X-ray light source along the propagation direction of the X-ray 10 (a conventional light source ...

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Problems solved by technology

However, the above-mentioned devices and methods have the disadvantage of low spatial resolution of images. The spatial resolution of images obtained by this device and method i

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