CT system parameter calibration and imaging method based on random transform

An imaging method and technology of system parameters, which can be used in measurement devices, instruments, scientific instruments, etc., can solve problems such as poor imaging quality, and achieve the effect of small amount of data, simple calculation, and high imaging quality.

Inactive Publication Date: 2019-05-17
SHAANXI NORMAL UNIV
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Problems solved by technology

[0003] In order to solve the problem of poor imaging quality in the prior art, the present in...

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  • CT system parameter calibration and imaging method based on random transform
  • CT system parameter calibration and imaging method based on random transform
  • CT system parameter calibration and imaging method based on random transform

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Embodiment Construction

[0060] The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.

[0061] In order to solve the problem of poor imaging quality in the prior art, this embodiment provides a CT system parameter calibration and imaging method based on random transformation, refer to Figure 1-Figure 15, the CT system parameter calibration and imaging method based on random transformation, including:

[0062] Question 1. Place two calibration templates composed of uniform solid media on a square tray. The geometric information and absorption rate of the templates are known. The geometric information of the templates is as follows: figure 2 , according to the calibration template and the received information, solve the position of the rotation center of the CT system in the square tray, the distance between the detector units and the 180 directions of X-rays;

[0063] Question 2. Us...

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Abstract

The invention particularly relates to a CT system parameter calibration and imaging method based on random transform. A calibration target composed of two uniform solid mediums is placed on a square tray, geometric information and absorptivity of the calibration target are known, and according to the calibration target and received information, the position of a CT system rotation center in the square tray, the spacing of detector units and 180 directions of X-rays are solved; the received information of the unknown medium 1 obtained by a CT system in question 1 is utilized, the correspondingdata files of the unknown medium 1 are known in advance, and the calibration parameters in the question 1 are utilized to determine the position, geometric shape and absorptivity of the unknown medium1 in the square tray; relevant information of the unknown medium 2 are obtained in the same way; and a new template is designed and a corresponding calibration model is established to improve the calibration accuracy and stability of the CT system. The CT system parameter calibration and imaging method improves the accuracy of parameters and has high imaging quality, and the method for solving each parameter is intuitive and easy to understand.

Description

technical field [0001] The invention belongs to the field of CT technology application, in particular to a CT system parameter calibration and imaging method based on random transformation. Background technique [0002] CT technology uses the attenuation information of X-rays penetrating the object to reconstruct the tomographic image of the object. Now consider a two-dimensional CT system: in the vertical direction of the detector plane, X-rays are incident in parallel, and 512 detector units of the detector are arranged equidistantly. The position of the two-dimensional medium to be detected is fixed, and the entire transmitting-receiving system is rotated counterclockwise 180 times around a fixed rotation center, in other words, the X-ray direction is changed 180 times. The ray energy after absorption and attenuation of the two-dimensional medium to be detected can be measured, and 180 sets of received information can be obtained after processing such as gain. In order ...

Claims

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Application Information

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IPC IPC(8): G01N23/046
Inventor 梁洪涛朱鑫刘丽丽
Owner SHAANXI NORMAL UNIV
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