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A method for detecting motion artifact regions based on the gradient correlation of bone images and soft tissue images in dual-energy subtraction

A technology for detecting motion and motion artifacts, applied in image analysis, image enhancement, image data processing, etc., can solve problems such as detecting motion artifact areas on chest X-rays, and achieve the effect of preventing false information

Active Publication Date: 2018-12-11
SOUTHERN MEDICAL UNIVERSITY
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Problems solved by technology

But so far, there is no relevant technology to detect motion artifact areas in conventional chest radiographs

Method used

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  • A method for detecting motion artifact regions based on the gradient correlation of bone images and soft tissue images in dual-energy subtraction
  • A method for detecting motion artifact regions based on the gradient correlation of bone images and soft tissue images in dual-energy subtraction
  • A method for detecting motion artifact regions based on the gradient correlation of bone images and soft tissue images in dual-energy subtraction

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Embodiment 1

[0028] A method for detecting motion artifacts based on the gradient correlation of bone images and soft tissue images, based on the following two assumptions:

[0029] Ⅰ, when there is no motion artifact in the corresponding area of ​​the bone image and soft tissue image, the correlation is approximately 0;

[0030] Ⅱ. For areas with motion artifacts, gradient aliasing occurs on bone images and soft tissue images, and generally shows a negative correlation.

[0031] The method for detecting motion artifacts of the present invention, such as figure 1 As shown, it specifically includes the following steps:

[0032] (1) Perform preprocessing on the dual-energy subtraction image data of the same object, including conventional X-rays, soft tissue images obtained by low-energy X-ray irradiation, and bone images obtained by high-energy X-ray irradiation, to obtain the same size corresponding to the same anatomical structure. Normal chest radiographs, soft tissue images, and bone i...

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Abstract

The invention discloses a method for detecting a motion artifact area based on gradient correlation between a bone image and a soft tissue image in a dual energy subtraction. The method includes the following steps: (1) separately conducting pre-treatment on the bone image and the soft tissue image so as to make the bone image and the soft tissue image to have consistent spatial structures and identical sizes; (2) separately obtaining a gradient image of the processed bone image and the processed soft tissue image by using a central difference; (3) calculating correlation between the bone gradient image and the soft tissue gradient image by using triangular convolution; (4) detecting a motion artifact area, setting threshold coefficients, and defining areas with a correlation smaller than a certain negative threshold value as an artifact area; (5) removing smaller areas and increasing detection rate; (6) filling cavities, preventing erroneous detection of non-motion artifact areas in non-communication motion artifact areas. According to the invention, the method can accurately detect motion artifact areas in a chest radiography photographed by conventional X-ray radiography.

Description

technical field [0001] The invention relates to the technical field of detection methods for gradient correlation regions of medical images, in particular to a method for detecting motion artifact regions based on gradient correlations between bone images and soft tissue images in dual-energy subtraction. Background technique [0002] Motion artifact is a common type of artifact in ordinary X-ray photography, mainly due to the voluntary or involuntary movement of the subject. The involuntary movement of the subject includes, for example, breathing movement, heartbeat, pulsation of great blood vessels, eyeball movement, etc. The generation of this artifact seriously affects the quality of X-ray photographs. Clinically, this artifact can be reduced by reducing the exposure time and strengthening the cooperation of the examinee. However, due to the speed limitations of current medical imaging equipment and some uncontrollable factors, motion artifacts cannot be completely elim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
CPCG06T7/0012G06T2207/10116G06T2207/30008
Inventor 阳维刘云碧卢振泰冯前进
Owner SOUTHERN MEDICAL UNIVERSITY
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