X-ray imaging system and method based on grating phase contrast and photon counting

Abstract

The invention discloses an X-ray imaging system and method based on grating phase contrast and photon counting. X-rays become coherent X-rays after being shaped through a light source grating; the coherent X-rays containing phase changes after penetrating through samples form beam-split X-rays through a phase grating; the phase changes of the X-rays are converted into light intensity changes after the X-rays pass an analyzing grating; a photon counting detector is used for recording phase contrast information of the X-rays with different intensities; sectional images based on phase contrast are obtained through a three-dimensional reconstruction system; finally, components and interior fine structure information of the soft tissue samples are obtained. The system and method can be used for detecting soft tissue samples in the pathology department, the radiology department and the scientific research department of a hospital, early lesion information such as small lesions in the tissue samples can be found easily, and the detection rate is greatly increased.

Description

technical field [0001] The invention relates to an X-ray imaging system, in particular to an X-ray imaging system based on grating phase contrast and photon counting technology, and also relates to a method for realizing X-ray imaging by the system, which belongs to the technical field of medical imaging. Background technique [0002] X-rays are particularly penetrating. When X-rays pass through samples made of light elements such as carbon, hydrogen, and oxygen, it is like visible light passing through glass, leaving no observable traces. This is extremely unfavorable to medical diagnosis. For example, for the diagnosis of breast tumors, breast tumors are still lesions composed of light elements in the early stages of development, and absorption contrast imaging is powerless to them. It is not until breast tumors develop into late stages that calcification occurs can be seen in absorption contrast imaging. The best opportunity for treatment has been missed like this, whic...

AI Technical Summary

Problems solved by technology

However, the synchrotron radiation X-ray source is a large-scale scientific device, and its equipment and maintenance costs are high. Using it as a medical clinical diagnosis device does not conform to the principle of efficient use of energy and resources, and the cost of imaging diagnosis is not affordable for ordinary patients.

The low-power micro-focus X-ray source has sufficient coherence (using a micro-focus X-ray source is equivalent to using a small hole to obtain coherent light), but the beam is too narrow, the luminous flux is too small, and the detector requires a long exposure time, which is difficult Meet the actual needs of clinical application

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