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Computerized Tomography (CT) image uniformization metal artifact correction method based on four-order total-variation shunting

A fourth-order full-variable shunt and CT image technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as complex operation, large amount of calculation, and difficulty in practical application

Inactive Publication Date: 2013-09-18
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

The iterative method can effectively remove metal artifacts and suppress noise, and can well present the structure of metal objects, but its computational complexity is very large, the speed is very slow, and it is difficult to be practical
Statistical methods and filtering methods are not very sensitive to noise, and can well represent the structure of metal objects, but the operation is complicated, which has great limitations in real medical CT

Method used

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  • Computerized Tomography (CT) image uniformization metal artifact correction method based on four-order total-variation shunting
  • Computerized Tomography (CT) image uniformization metal artifact correction method based on four-order total-variation shunting
  • Computerized Tomography (CT) image uniformization metal artifact correction method based on four-order total-variation shunting

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Embodiment Construction

[0057] The technical solution of the present invention will be described in detail below in conjunction with specific embodiments of the accompanying drawings.

[0058] refer to figure 1 Introduce the main steps of the present invention:

[0059] Step 1, raw scan data collection

[0060] The rotating table is controlled by software to rotate at a small angle, generally not more than 1°, and the micro-computed tomography system collects 360° biological projection data. Use the preprocessing software to perform compensation for bad points and bad lines, bright field and dark field correction, and geometric correction preprocessing on the computer tomography projection data, and then obtain the sinogram g(m,n),m=1,...M,n=1, ...N, M is the total number of detectors, N is the total number of projection angles.

[0061] Step 2, Determine the metal area

[0062] Using the fan beam projection data g(m,n) obtained in step 1, directly reconstruct the projection data with FBP to obtain...

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Abstract

The invention relates to a Computerized Tomography (CT) image uniformization metal artifact correction method based on four-order total-variation shunting, wherein solving is carried out on the basis of a convexity splitting method to achieve metal artifact correction. The CT image uniformization metal artifact correction method includes the specific steps of collecting data, reconstructing images, dividing metal zones, calculating priori images, obtaining re-projection of the metal zones and the priori images, uniformizing projection data, performing four-order total-variation equation correction, reversely uniformizing the corrected data, reconstructing images again and restoring the image metal zones. The CT image uniformization metal artifact correction method can effectively remove metal artifacts, well maintains structural information of metals and the periphery of the metals, and limits secondary artifact from appearing to the maximum extent and the like.

Description

technical field [0001] The invention belongs to the field of medical image processing, relates to the field of CT image processing, in particular to a method for correcting metal artifacts. Background technique [0002] At present, the application of CT is more and more extensive, and a series of new problems follow, and the metal artifact in the reconstructed image is one of them. Metallic artifacts appear as light and dark strip artifacts in the image, which reduce the image quality and seriously affect the subsequent processing and analysis of the image. The formation of metal artifacts is mainly due to beam hardening. The X-rays actually produced by CT cover a very wide spectrum, and the linear attenuation coefficient of most materials is related to energy. Higher photons are absorbed more, resulting in a larger ratio of high-energy photons and X-rays become "harder". After the ray passes through a substance with a high absorption coefficient such as a metal substance...

Claims

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Application Information

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IPC IPC(8): G06T5/50A61B6/03
Inventor 赵恒马德超朱守平李军陈多芳梁继民田捷
Owner XIDIAN UNIV
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