CT system parameter calibration and imaging algorithm

A technology of system parameters and algorithms, applied in computing, image enhancement, image analysis, etc., can solve problems such as existing errors and affecting imaging quality, and achieve the effect of small error and high precision

Inactive Publication Date: 2018-09-28
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Problems solved by technology

However, there are often errors in the installation of CT systems, which affect the quality of imaging

Method used

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  • CT system parameter calibration and imaging algorithm
  • CT system parameter calibration and imaging algorithm

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and description of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0068] In order to better explain the algorithm of the present invention, a typical two-dimensional CT system is introduced. In this system, the parallel incident X-rays are perpendicular to the plane of the detector, and each detector unit is regarded as a receiving point and arranged at equal distances. The relative position of the X-ray transmitter and detector is fixed, and the entire transmitting-receiving system rotates 180 times counterclockwise around a fixed center of rotation. For each X-ray direction, measure the ray energy absorbed and attenuated by a fixed two-dimensional medium to be detected on a detector with 512 equidistant units, and after processing such as gain, 180 groups of received informati...

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Abstract

The invention relates to the CT technology application field, provides a CT system parameter calibration and imaging algorithm and aims to solve a dilemma of a CT system in actual application. The position of the rotation center of a CT system in a square tray, the distance between detector units, and 180 directions of X rays are determined based on that a template has the uniform medium and the template geometric formation and the absorption rate are known; the acquired calibration parameters are utilized to determine the position of the unknown medium in the square tray, the geometric shapeand the absorption rate; the relevant information of the unknown medium is determined through the known calibration parameters; parameter calibration accuracy and stability are discussed. Certain reasonable hypotheses are provided in the CT system parameter calibration and imaging algorithm, the to-be-tested sample is infinitely thin, and the parallel plate has no offset when rotating. The algorithm is advantaged in that accuracy is high, the result error is small, and the result is close to the actual value.

Description

Technical field [0001] The invention relates to the application field of CT technology, in particular to a CT system parameter calibration and imaging algorithm. Background technique [0002] CT is the abbreviation of Computerized Tomography, that is, computer tomography. CT technology refers to a kind of projection data of a certain physical quantity (such as wave speed, X-ray intensity, electron beam intensity, etc.) obtained from the surrounding object without destroying the internal structure of the object, combined with a certain mathematical algorithm, Computer processing, reconstruction of a two-dimensional image on a specific level of an object, and a three-dimensional image based on a series of two-dimensional images. [0003] Radon transform is the main theoretical basis of CT technology. The Radon transform was proposed by the mathematician Radon in 1917. The Radon transform is simply a theoretical method of seeking projection. In the two-dimensional case, the origina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/60G06T7/77
CPCG06T7/60G06T2207/10081G06T2207/20024G06T2207/20048G06T7/77
Inventor 潘斌时澄郭小明朱峰王玉铭陶金鑫梁永侦戴璞微
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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