Multi-energy detector X-ray phase contrast imaging method and system, storage medium and equipment

Abstract

The present invention provides a multi-energy detector X-ray phase contrast imaging method. The method comprises the steps of constructing an imaging system comprising set energy, configuring a detector which at least comprises two energy regions, collecting a sample image of each energy region, and acquiring an absorption image, a refraction image and a scattering image of the imaging system. Theinvention also relates to a multi-energy detector X-ray phase contrast imaging system, electronic equipment and a storage medium. The configured detector at least comprises two energy regions, and the set energy of the imaging system falls to the first energy region of the two energy regions; a moire fringe with the highest contrast ratio is acquired from the first energy region, and a moire fringe with zero contrast ratio is acquired from the other region; and the sample image of the energy region with the zero contrast ratio is collected to be taken as the absorption image of the sample, and the sample image of the first energy region is collected and the obtained absorption image is removed to obtain the scattering image and the refraction image. The method eliminates a phase steppingprocedure, greatly improves the phase contrast imaging speed and simultaneously reduces the precision requirement on mechanical components.

Description

technical field [0001] The invention relates to the field of X-ray imaging, in particular to an X-ray phase-contrast imaging method for a multi-energy detector. Background technique [0002] Compared with the traditional absorption-based imaging method, the X-ray phase contrast imaging method has attracted extensive attention since it was proposed because of its obvious advantages for low atomic number substances such as human soft tissue. Since the 1990s, X-ray phase contrast imaging mainly includes crystal interferometer method, diffraction enhanced method, coaxial method and grating interferometer method. Since the X-ray phase shift detection requires a relatively high coherence of the X-ray source, it was initially done on synchrotron radiation. In 2006, inspired by the phase measurement of visible light, Pfeiffer et al. added a source grating to the original Talbot interferometer based on two gratings, and proposed a Talbot-Lau interferometer that can use ordinary ligh...

AI Technical Summary

Problems solved by technology

The mainstream information separation technology is the phase stepping method, which needs to step the grating when the fringe information is collected, which takes a long time, has a large dose, and requires high mechanical precision.

In order to increase the speed of grating phase-contrast imaging, special-shaped grating method, object scanning method and Fourier analysis method have also been proposed respectively, but while bringing certain improvements, each has its own defects. The special-shaped grating method increases the design and manufacturing cost additionally. The object scanning method still requires the movement of the measured object, and the Fourier analysis method has high requirements for the consistency of Moiré fringes

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