Method used for rapid determination of exposure parameters of digital radiography (DR)/computed tomography (CT) imaging system

Abstract

The present invention provides a method for rapidly determining exposure parameters of DR and CT imaging. First, the exposure parameter model of the DR / CT imaging system is obtained, and then the exposure parameter is rapidly obtained according to the obtained exposure parameter model. The present invention can obtain the exposure parameter model of the DR / CT imaging system through simple steps, and the model is effective for a long time, and the workload spent on its establishment can basically be ignored. According to the obtained DR / CT imaging system exposure parameter model, the exposure parameters can be automatically and quickly obtained, so that the signal-to-noise ratio and contrast of the DR / CT image can be optimized, overcoming the existing technology to obtain exposure parameters requires a lot of manual interaction and relevant professional technical experience problems, thereby prolonging the service life of the DR / CT imaging system relatively.

Description

technical field [0001] The invention belongs to the technical field of radiography and detection, and relates to a method for determining exposure parameters of digital radiography (Digital Radiography, DR) and computed tomography (Computed Tomography, CT). Background technique [0002] In recent years, ray digital imaging DR and computed tomography CT have been accelerated in the field of industrial non-destructive testing, and have become indispensable detection methods for some key components. DR imaging is the basis of CT imaging. The selection of exposure parameters is one of the basic problems of DR / CT imaging system, which not only directly affects the image quality, but also is the main means to control the radiation dose. How to quickly obtain optimized DR / CT imaging system exposure parameters, reduce manual dependence, and improve image quality has become a concern in the field of non-destructive radiation testing. [0003] In DR / CT non-destructive testing, to qui...

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Problems solved by technology

[0003] In DR / CT non-destructive testing, to quickly and effectively find out the appropriate exposure parameters, it is generally searched according to the exposure curve, the exposure curve is the relationship between the transillumination parameters and the transillumination thickness drawn under certain conditions, but The method of finding exposure parameters based on exposure curves is subject to manual and empirical intervention.

In addition, the influence of different exposure parameter combinations on image quality can be analyzed through experiments, so as to obtain the correlation between scanning voltage and exposure amount and image quality, but no practical operation method has been formed so far.

The CT scanning automatic exposure control technology that has appeared in recent years aims to reduce the CT radiation dose while ensuring the image quality. It can automatically adjust the exposure according to the thickness of the object to be irradiated at a specific position to keep the image noise at a certain level, but it is not suitable for industries with unknown thickness. Special-shaped parts are difficult to implement, and automatic exposure control needs to be given a reference value. If it is not set properly, it may affect the image quality or increase the radiation dose

[0004] Due to the complex and changeable materials and shapes of actual industrial parts, when performing DR / CT non-destructive testing, the criteria for determining exposure parameters are not clear enough, the optimization is insufficient, the efficiency is low, and the manual dependence is high

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