Method and application for eliminating microscopic CT image geometric artifact

Abstract

The present invention relates to a method for eliminating a microscopic CT image geometric artifact. The method comprises the steps: performing CT scanning of a marker and a measured object at the same time; extracting the barycentric coordinates of the projection of the marker on a detector, and employing the barycentric coordinates to build the optimization model of the geometrical parameter at each projection angle; and solving the optimization model, determining the correct CT system geometrical parameter, and using the estimated geometrical parameter into the rebuilding process. According to the technical scheme of the invention, the method and application for eliminating the microscopic CT image geometric artifact can eliminate the non-repeating geometrical parameter error caused by factors such as focus shifting and the like, and can employ the correct system geometrical parameters to perform CT image rebuilding so as to obtain the CT image which has eliminated the geometric artifact.

Description

technical field [0001] The invention relates to the technical field of CT application, in particular to a method and application for eliminating geometric artifacts in micro-CT images. Background technique [0002] Micro Computed Tomography (Micro Computed Tomography) is widely used in many fields such as medicine, pharmacy, materials, electronics, biology, etc. Compared with ordinary clinical medical CT, its spatial resolution can reach micron or even submicron. Geometric artifacts are one of the important factors affecting the resolution of micro-CT images. When there is an error between the "geometric parameters in the CT image reconstruction model" and the "geometric parameters when scanning the object", geometric artifacts will appear in the reconstructed image. In the process of multiple scanning or single scanning, according to the change of the error between the "model reconstruction geometric parameters" and "system scanning geometric parameters", the geometric para...

AI Technical Summary

Problems solved by technology

None of the above invention patent publications can eliminate the non-repetitive geometric parameter errors caused by factors such as focus drift

In addition, Patent Publication 1 has higher precision requirements for the phantom, requiring the three holes in the phantom to form an equilateral triangle, and it is also necessary to accurately measure the distance between the holes

Patent Publication 2 needs to use the symmetrical angle data of the filament, which cannot be used for limited-angle CT scanning and half-detector CT scanning

Images