Coaxial phase contrast imaging method and system and phase contrast CT method and system

Abstract

The invention provides a coaxial phase-contrast imaging method. The coaxial phase-contrast imaging method is characterized in that rays with spatial coherence are generated by a micro-focal-spot X-ray source and penetrate through an imaging object with fixed position on a rotary platform; images after the rays penetrate through the imaging object are received by a detector, and specifically, exposure imaging is carried out respectively on the images which are generated by the micro-focal-spot X-ray source working under two voltages and are formed by different rays penetrating through the imaging object so as to obtain a double-energy-spectrum image; the light-intensity distribution and the spectrum-density distribution at the incident plane position of the imaging object under the two voltages are respectively tested; according to the double-energy-spectrum image, the light-intensity distribution and the spectrum-intensity distribution, phase retrieval is carried out. The coaxial phase-contrast imaging method provided by the invention has the advantages that highly-difficult and accurate registration of multiple images is not needed and the cost is low. In addition, the invention also provides a coaxial phase-contrast imaging system. Meanwhile, on the basis of the coaxial phase-contrast imaging method, the invention provides a phase-contrast CT method which can be used for restoring multiple information of the imaging object. In addition, the invention also provides a phase-contrast CT system.

Description

technical field [0001] The invention relates to the field of phase contrast imaging, in particular to a coaxial phase contrast imaging method and system, and a phase contrast CT method and system. Background technique [0002] Traditional X-ray imaging is based on the absorption mechanism and has important applications in medicine, environment, materials, industry, security inspection, etc. However, for some substances mainly composed of light elements such as C, H, and O, such as biological tissues, Fibrous, polymeric materials with little or no absorption give poor image contrast. [0003] X-ray phase contrast imaging (phase-contrast imaging) is another X-ray imaging technology developed in recent years, which uses the phase shift changes that occur after X-rays pass through objects. For light elements, the typical X-ray phase shift sensitivity is more than a thousand times greater than the absorption sensitivity, which can significantly improve the image contrast of weak...

AI Technical Summary

Problems solved by technology

Traditional phase contrast CT can only obtain the structural information of the object

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