Cone beam CT (computed tomography) area-of-interest scanning method based on visualization

Abstract

The invention discloses a method for obtaining a high-resolution area-of-interest image through secondary scanning on the basis of visualization. The method comprises the following steps that the positions of a turntable and a radiation source are regulated, the distance is zoomed out, the wider visual field is shown, and an object is subjected to whole primary scanning; the three-dimensional visual reconstruction and the MPR (multiple planar reconstruction) are carried out according to a scanning result; reconstruction results are combined to be displayed, and the area-of-interest position is determined through interaction in the three-dimensional space; meanwhile, the positions of the turntable and the radiation source, the height of the turntable, the position of the object on the turntable and the resolution of imaging equipment are regulated, so that the center of interest is positioned in the center of the turntable, meanwhile, the visual field can just accommodate the area of interest, and the area-of-interest fine scanning is carried out after the regulation. The reconstruction is carried out according to the fine scanning result, and a high- resolution image of the area of interest is obtained. The method has the advantages that the positioning scanning of the area of interest can be realized, meanwhile, the resolution of the region scanning can be obviously improved, simplicity is realized, and the realization is easy.

Description

technical field [0001] The invention belongs to the field of cone-beam CT high-resolution imaging, and in particular relates to a visualization-based cone-beam CT interest region secondary scanning method. Background technique [0002] A conventional cone beam CT system is mainly composed of a ray source, a mechanical scanning mechanism, a radiation detector, a shielding device and an electronic computer subsystem. Cone beam CT can perform high-resolution X-ray imaging of bones, teeth, living small animals and various material devices without destroying the sample, and obtain detailed three-dimensional structural information inside the sample, thereby displaying three-dimensional images of each part. The use of cone beam can not only obtain a true isotropic volume image, improve spatial resolution, and improve the utilization rate of rays, but also acquire the same 3D image much faster than fan beam CT. [0003] The imaging resolution of cone beam CT is mainly affected by t...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a method based on visual cone beam scanning object inte

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