A Method for Removing Metal Artifacts in CT Images

A CT image and metal artifact technology, applied in the field of medical CT image processing, can solve the problems of high price and limitation of related equipment, and achieve the effect of improving diagnostic ability, less parameters, and simple form

Active Publication Date: 2018-01-02
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

However, the application is limited by the development of hardware, and the price of related equipment is very high
However, the existing ordinary CT scanning machines can only emit X-rays with a single peak energy spectrum (that is, mixed-energy X-rays), and can only obtain a mixed-energy CT image.

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  • A Method for Removing Metal Artifacts in CT Images
  • A Method for Removing Metal Artifacts in CT Images
  • A Method for Removing Metal Artifacts in CT Images

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Embodiment Construction

[0056] A method for removing metal artifacts in a CT image of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0057] A method for removing metal artifacts in CT images of the present invention comprises the following steps:

[0058] 1) Measure the effective energy of the mixed energy emitted by the X-ray tube of the CT machine, and the measured effective energy is denoted as E eff ;

[0059] 2) Use the mixed energy X-ray of the CT machine to acquire a CT image containing metal artifacts, and regard the acquired image as the effective energy E eff The mono-energy CT image below is denoted as I eff ;

[0060] 3) Read effective energy E eff The single-energy CT image of I eff CT value in;

[0061] 4) The single-energy CT image I eff The CT value of is converted to the linear attenuation coefficient under the target monoenergetic energy E, which is obtained by the following formula:

[0062] mu x...

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Abstract

The invention discloses a method for removing metal artifacts in CT images. The method comprises following steps: detecting effective energy of mixed energy X-rays, and acquiring a CT image containing metal artifacts, wherein the CT image is the mono-energy CT image under effective energy; reading a CT value of the CT image, converting the CT value into a linear attenuation coefficient under target mono-energy, then calculating the CT value under the target mono-energy, and acquiring a CT image under the mono-energy; performing subtraction on the mono-energy CT image under the effective energy and the CT image under the target mono-energy, and respectively retaining a metal part and a soft tissue part so as to obtain a subtraction metal image and a subtraction soft tissue image; replacing the CT value of the artifact part in the mono-energy CT image under the effective energy through related calculation so as to obtain a CT image whose artifacts are removed; and replacing the CT value of the black artifact part in the CT image whose artifacts are removed through related calculation so as to obtain a CT image containing a filling value. By establishing reasonable, effective, simple and rapid math models in the method, the metal artifacts in the CT images under mixed energy can be removed.

Description

technical field [0001] The invention relates to a medical CT image processing method. In particular, it relates to a method for removing metal artifacts in CT images. Background technique [0002] With the discovery and use of X-rays, the theory of dual-energy X-rays was proposed by Jacobson in 1953. In recent years, with the development of CT technology, dual-energy X-ray theory has been gradually applied to radiological diagnosis and treatment. Dual-energy CT imaging is the product of the application of dual-energy X-ray theory in the field of CT imaging. Its main function is to remove metal artifacts that are ubiquitous in ordinary CT images. [0003] The currently widely used dual-energy CT theory is the "energy-selective reconstructions in X-ray Computerized Tomography" mentioned in the article "Energy-selective Reconstructions in X-ray Computerized Tomography" published by Robert E. Reconstruction method": The interaction between X-rays and human tissues is simply d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03A61B6/00
Inventor 冯远明王刚杨成文撒昱
Owner TIANJIN UNIV
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