Cone-beam CT system plate detector image anti-interference calibration method

Abstract

The utility model discloses an anti-interference correction method of flat panel detector image in cone-beam CT system, which is characterized in that collection parameter is set, the plat panel detector is shielded partially, dark image, blank exposure image and object projection image are collected; average dark field image, gain correction image and bad pixel template image are calculated; dark field correction, dark field fluctuation correction, gain correction, bad pixel correction and gain strip correction are made on the object projection image; the filtering de-noising treatment is made on the object projection image, the object segmentation image is re-constructed by the object projection image. The blank exposure image is reconstructed to be a blank segmentation image, the segmentation correction image is calculated; the segmentation correction is made on the object segmentation image; the filtering de-noising treatment is made on the object segmentation image. The utility model has the advantages that the correction result is obviously better than that of the prior correction calculation method, enabling. to effectively dispose the linear and annular artifacts that can not be eliminated by the prior correction method, moreover image signal-to-noise ratio is higher or equal to the prior level.

Description

Anti-interference correction method of flat panel detector image in cone beam CT system Technical field The invention belongs to the field of computer image processing, and relates to a set of correction solutions corresponding to the output image of a flat-panel detector used in a CT system. Background technique High-resolution cone-beam CT is the most promising high-tech in the world to solve non-destructive testing problems, involving radiology, graphics and imaging, mathematics, physics, mechanics, and computers. Compared with traditional CT, cone-beam CT can obtain hundreds or even thousands of cross-sectional projections at a time, with high scanning speed, small slice thickness, isotropic spatial resolution, and high accuracy. The use of a flat panel detector (FlatPanel Detector) as a projection image acquisition component is one of the main differences between cone beam CT and traditional CT. The flat panel detector is a new generation of digital X-ray area array imag...

AI Technical Summary

Problems solved by technology

In order to overcome the inadequacy of the prior art that cannot fully effectively remove artifacts, the present invention provides an anti-interference correction method for flat-panel detector images in a cone-beam CT system, which can obtain high-quality projection images and reconstructed slice images

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