CT (Computed Tomography) image reconstruction method based on array X ray source and detector

Abstract

The invention discloses a CT (Computed Tomography) image reconstruction method based on an array X ray source and a detector, and aims to solve the defect that the traditional CT is far away from an imaging object due to a reason of a single taper angle. The method can be closer to the imaging object and has the advantages of being quick in scanning, low in cost, small, flexible and easy in implementation and is free from mechanical movement, and unnecessary dose radiation is avoided. A plurality of X ray sources on a plurality of arrays are used for emitting tapered rays, and the detector is used for receiving photons; when each X ray source on the array is subjected to time-share illumination, one taper angle corresponding to each ray source subjected to time-share emission only can cover parts of the imaging object to obtain a time-share projection image; a time-share array multi-source CT reconstruction method is used for reconstruction; when all X ray sources on the array are simultaneously illuminated, the rays which are simultaneously illuminated cover the whole imaging object; and since a plurality of ray source scanning areas are subjected to coverage, a projection received by the detector has an aliasing part, and the reconstruction method for the array multi-source CT on the basis of the aliasing is put forward for reconstruction.

Description

technical field [0001] The invention relates to the technical field of X-ray imaging, in particular to a CT image reconstruction method based on an array X-ray source and a detector. Background technique [0002] With the wide application of X-ray imaging technology, people have higher and higher requirements for reducing X-ray imaging dose, improving imaging resolution and imaging speed. Traditional CT imaging technology is limited by hot cathode X-ray tubes and mechanical scanning speed, forcing people to look for new imaging methods to replace. It is encouraging that the array X-ray source is beginning to develop towards the direction of cold cathode and flat plate, which is expected to realize the transformation of X-ray source from point light source to addressable flat light source. Tight coupling, avoiding radiation to relevant areas, is expected to reduce the dose and reduce the volume of the imaging system, which is of great significance for the development of new ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the prior art, the present invention proposes a CT image reconstruction method based on arrayed X-ray sources and detectors, using multiple X-ray sources on multiple arrays for cone-beam CT scanning, which solves the problem of traditional CT The reason for the single cone angle is that it is far away from the imaging object. It can be closer to the imaging object and avoid unnecessary dose radiation. It has the advantages of fast scanning, low cost, small and convenient, no mechanical movement and easy implementation.

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