Method and device for carrying out ray security check physical property identification based on CT technology

Abstract

The invention provides a method and a device for carrying out ray security check physical property identification based on a CT technology. The method comprises the following steps: determining the linear attenuation coefficient [mu]N1 and [mu]N2 values of two groups of energy rays of each volume unit of a detected object through the CT technology; calculating the linear attenuation coefficient ratio RZ value of the two groups of energy rays of each volume unit of the detected object; converting the RZ values into Dz values, wherein although the function image shows that the DZ values and the RZ values are correspondingly and smoothly increased, the difference of the Dz values between different atomic number z substances is large; and determining the type of a detected object through the function relation between the atomic number z and the DZ values. The accuracy of physical property recognition of ray security inspection is improved.

Description

technical field [0001] The invention relates to the technical field of material attribute identification of radiation security inspection systems, in particular to a method for identifying physical properties of radiation security inspection based on CT technology. Background technique [0002] At present, the principle of X-ray transmission is widely used in radiation security inspection, such as CT scanning technology, and the principle imaging of CT (Computed Tomography computer tomography) technology is essentially the attenuation coefficient μ imaging of the medium. The physical principle of imaging is to solve the equations of μ through CT scanning, obtain the μ value of each tissue unit in a certain layer of the medium, then convert the μ value into a CT value, and finally transform the CT value into a grayscale image that can be visually recognized to determine the Detect the type of object, but due to the hardening phenomenon and the influence of absorption limit wh...

AI Technical Summary

Problems solved by technology

The physical principle of imaging is to solve the equations of μ through CT scanning, obtain the μ value of each tissue unit in a certain layer of the medium, then convert the μ value into a CT value, and finally transform the CT value into a grayscale image that can be visually recognized to determine the Detect the type of object, but due to the hardening phenomenon and the influence of absorption limit when the energy continuum X-ray interacts with the substance, it limits the identification of physical properties of radiation security inspection and reduces the accuracy of identification

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