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Design method and application of x-ray attenuator and ct device with attenuator designed by using the method

A design method and technology of attenuators, which are applied to measurement devices, instruments, scientific instruments, etc., can solve the problems of undiscovered patent publications, etc., and achieve the effects of reducing the dynamic counting range, improving the signal-to-noise ratio, and reducing the difficulty of selection.

Active Publication Date: 2017-11-21
天津三英精密仪器股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Through the search, no patent publications related to the multi-energy properties of X-ray photons have been found

Method used

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  • Design method and application of x-ray attenuator and ct device with attenuator designed by using the method
  • Design method and application of x-ray attenuator and ct device with attenuator designed by using the method
  • Design method and application of x-ray attenuator and ct device with attenuator designed by using the method

Examples

Experimental program
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Effect test

Embodiment 1

[0069] A kind of X-ray attenuator design method, the steps are as follows:

[0070] (1) According to the properties of the measured object, select an equivalent material close to the X-ray absorption coefficient of the measured object;

[0071] ⑵Establish the mapping relationship between the equivalent material thickness of the measured object and the attenuator thickness according to the equivalent material properties of the measured object, X-ray properties, filter properties and CT equipment parameters;

[0072] (3) According to the mapping relationship established in step (2) and the thickness distribution of X-rays passing through the equivalent material of the measured object in different directions, the thickness distribution of the attenuator is obtained;

[0073] (4) Process the attenuator according to the thickness distribution of the attenuator obtained in step (3).

[0074] Specifically, the steps can be as follows:

[0075] (1) Neglecting the influence of scatte...

Embodiment 2

[0101] A kind of X-ray attenuator design method, the steps are as follows:

[0102] Core CT scanning system such as figure 1 As shown, it consists of a ray source 2, a detector 4, a mechanical rotation system (not shown in the figure), an attenuator 1, and a control and computer (not shown in the figure). Neglecting the influence of scattering, the mathematical model of core CT is as follows:

[0103]

[0104] where x represents a point in a fixed coordinate system, μ s (E) represents the linear attenuation coefficient distribution of the equivalent material of core 3 to photons with energy E, μ a (E) represents the linear attenuation coefficient of the unit length of the attenuator to the photon of energy E, r is the thickness of the attenuator through which the ray reaches the detector unit, S(E) represents the normalized energy spectrum, where E min and E max represent the minimum and maximum values ​​of photon energy, respectively, and I(t, r) represents the project...

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Abstract

The invention relates to an X-ray attenuator design method comprising the following steps that equivalent material of which the X-ray absorption coefficient is close to that of a tested object is selected according to the properties of the tested object; a mapping relation of the thickness of the equivalent material of the tested object and the thickness of an attenuator is established according to the properties of the equivalent material of the tested object, X-ray properties, filter properties and CT equipment parameters; thickness distribution of the attenuator is obtained according to the established mapping relation and the thickness distribution of the equivalent material of the tested object through which X-rays penetrate along different directions; and the attenuator is manufactured through processing according to the obtained thickness distribution of the attenuator. According to the attenuator designed through the method, dynamic counting range of a detector can be effectively reduced, flow intensity of the X-rays can be fully utilized and the signal-to-noise ratio of reconstructed images can be enhanced; and nonlinear polychromatic projection data of scanning the object are corrected into monochromatic projection data so that hardening artifacts in CT images can be reduced and density resolution and spatial resolution of the CT images can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of detection equipment, in particular to a design method and application of an X-ray attenuator for CT imaging. The attenuator designed by the method can be applied to X-ray CT imaging detection or DR detection of similar rotating workpieces middle. Background technique [0002] Core is one of the most important basic geological data in the exploration and production of oil and gas fields. In the research field of oil and gas field exploration and production, X-ray CT imaging technology can be used to obtain high spatial resolution 3D macroscopic structure images of the whole core and local microstructure images of the core, combined with drilling, logging, geological analysis and testing, etc. It is of great significance to the exploration and development of oil and gas fields to comprehensively carry out digital core modeling and analysis based on geological data. [0003] When collecting core CT data, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21K1/10G01N23/04
CPCG01N23/04G01N2223/616G21K1/10
Inventor 张朋李孟飞
Owner 天津三英精密仪器股份有限公司
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