Method for determining gain functions of flat panel detector, image correction method and image correction device

Abstract

The embodiment of the invention discloses a method for determining gain functions of a flat panel detector, an image correction method and an image correction device. The determining method comprisesthe following steps: acquiring a first dark field image and a first bright-field image of a full-size area, wherein the full-size area comprises a first area covered by X-rays and a second area not covered by the X-rays; determining a gain function of the first area based on the first dark field image and the first bright-field image; determining gain of pixel points in the second area based on gain of the edge pixel points adjacent to the second area in the first area; and determining a gain function of the full-size area based on gain of the pixel points in the second area and the gain function of the first area. According to the embodiment of the invention, the correction accuracy of gain functions is improved, and the image correction quality is significantly improved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a method for determining a gain function of a flat panel detector, an image correction method and a device. Background technique [0002] X-rays are electromagnetic radiation with wavelengths between ultraviolet and gamma rays. X-rays are penetrating and have different penetrating abilities for substances of different densities. In medicine, X-rays are generally used to project human organs and bones to form medical images. The flat panel detector is a kind of precision equipment, which plays a decisive role in the quality of X-ray imaging. Familiar with the performance indicators of the flat panel detector can help to improve the imaging quality and reduce the X-ray radiation dose. [0003] Flat panel detectors generally include amorphous selenium flat panel detectors and amorphous silicon flat panel detectors. An ideal flat-panel detector would provide a homogeneous ...

AI Technical Summary

Problems solved by technology

[0005] At present, for the beam detector that is difficult to cover the entire area of ​​the flat-panel detector, the gray level difference between the bright-field image and the dark-field image of the pixel in the area not covered by X-rays in the flat-panel detector is zero, resulting in no X-ray coverage. The gain of the pixel points in the ray coverage area is infinite, which makes the calculated gain function of the flat panel detector inaccurate, and thus affects the subsequent image correction effect

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