Detector afterglow correction method for ray imaging

Abstract

The invention provides a detector afterglow correction method for ray imaging. At first, ray source voltage and currents, a detector operating mode and a collecting speed which are needed for scanning are selected according to a detection object, an afterglow attenuation model of a detector under current scanning parameters of a ray imaging system is obtained, then formal scanning is carried out, a group of projected images of the diction object are obtained, and finally fast afterglow correction computation is conducted according to the obtained afterglow attenuation model. According to the method, time constants of various attenuation components of detector materials do not need to be known, the afterglow attenuation model of the detector under the current scanning parameters of the ray imaging system can be obtained just before the formal scanning through simple afterglow modeling scanning, the method is quite convenient to implement in an actual ray imaging system, and the model can be reused to some extent. In addition, the calculated amount of afterglow correction based on a gray scale-afterglow corresponding list is greatly reduced, and obvious influences on efficiency of normal detection cannot be caused.

Description

technical field [0001] The invention belongs to the technical field of radiography and detection, and relates to an afterglow modeling and correction method of detector ray imaging. Background technique [0002] In recent years, Digital Radiography (DR) and Computed Tomography (Computed Tomography, CT) have accelerated their development in the fields of medical diagnosis and industrial non-destructive testing, and have become indispensable detection methods for some key components. Among them, DR Imaging is the basis of CT imaging. [0003] The imaging components in DR and CT imaging systems are detectors, which are generally divided into two types: linear array detectors and area array detectors. Area array detectors generally include flat panel detectors and image intensifiers. No matter what kind of detector it is, as long as its basic principle is to convert rays into visible light and then convert visible light into electrical signals, there will be afterglow phenomeno...

AI Technical Summary

Problems solved by technology

In terms of afterglow description and correction, the method of multi-exponential modeling and recursive correction can effectively reduce the artifacts caused by afterglow, but the amount of calculation is large, which will affect the detection efficiency in practice. In addition, because this method needs to obtain detector materials in advance The time constants of various attenuation components require a large number of prior experiments to determine, and it is difficult for ordinary users to obtain accurate detector material components and their ratios, making it difficult to implement in general imaging

In addition, adjusting the output mode and data recording method of the detector can also achieve a certain afterglow suppression effect, but it will increase additional machine time consumption, and the generality of the specific implementation method is also poor

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