Flat panel detector and method for reducing image persistence of same

Abstract

The invention provides a flat panel detector and a method for reducing image persistence of the flat panel detector. The method comprises the steps of: implementing correction preprocessing operation on a target image and a contrast image; realizing function calculation of an image persistence attenuation coefficient K and a glass leakage current compensation coefficient Kd according to variables such as a time interval and an exposure window between the contrast image and the target image; and finally subtracting image persistence from the target image through a subtraction formula, so as to achieve the purpose of reducing or eliminating the image persistence finally. By adopting a method of inserting the multi-frame automatically acquired contrast image in front of the target image, and performing formula calculation on pixel points containing image persistence information on the target image by utilizing the situation that the corrected contrast image has image persistence of the same property, the purposes of reducing or eliminating the image persistence is realized without increasing the existing hardware cost, and the method has the advantages of high integration, flexibility and considerable market application value.

Description

technical field [0001] The invention belongs to the field of medical equipment and image processing, and in particular relates to a flat panel detector and a method for reducing image persistence of the flat panel detector. Background technique [0002] The mainstream of X-ray flat panel detectors are amorphous silicon and amorphous selenium. Due to the physical characteristics of amorphous silicon and amorphous selenium flat panel detectors: under certain shooting conditions, there will be afterimage problems on their exposed images, that is, The image obtained during the nth (n>1) imaging remains affected by the subject being photographed in the 1st to n-1th times, and the degree of this influence gradually increases according to the order of the 1st to n-1th times. Once image afterimage occurs, it takes a long time for natural attenuation to completely eliminate the influence of image afterimage. [0003] At present, most companies or research institutes that develop ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a flat panel detector and a method for reducing the image persistence of the flat panel detector, which is used to solve the problem that the image persistence of the flat panel detector is difficult to effectively eliminate in the prior art

Images