Computerized tomography (CT) image metal artifact correction method, device and computerized tomography (CT) apparatus

A metal artifact, CT image technology, used in image enhancement, image data processing, instruments, etc., can solve the problems of easy change of original image information, difficult to locate metal projection data, etc., to correct metal artifacts and ensure resolution. Effect

Active Publication Date: 2014-03-26
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0009] The invention provides a method for correcting metal artifacts in CT images, a device for correcting metal artifacts in CT images, and a CT device, which overcome the difficulty in locating metal projection data in the exi

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  • Computerized tomography (CT) image metal artifact correction method, device and computerized tomography (CT) apparatus
  • Computerized tomography (CT) image metal artifact correction method, device and computerized tomography (CT) apparatus
  • Computerized tomography (CT) image metal artifact correction method, device and computerized tomography (CT) apparatus

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[0044]In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0046] As mentioned in the background technology section, in the existing CT image artifact correction technology, the image resolution based on the post-processing method in the image domain is low, resulting in the blurred image after correction, and the metal correlation is often lost during the correction process. The reconstructed image often contains new artifacts; however, in the image correction process based on the projection data ...

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Abstract

The invention provides a computerized tomography (CT) image metal artifact correction method, a computerized tomography (CT) image metal artifact correction device and a computerized tomography (CT) apparatus. The computerized tomography (CT) image metal artifact correction method comprises the following steps that: a metal projection range caused by an interference object is determined according to an original image corresponding to original projection data; diagnosis object projection data after the removal of the interference object are obtained based on metal projection data in the metal projection range, and after that, the original projection data are corrected and a model image is constructed based on the diagnosis object projection data; and secondary correction is performed on the original projection data according to the projection data of the model image, and reconstruction is performed based on corrected target projection data and according to clinically-used scanning and image construction conditions so as to obtain a metal artifact-free target image, and therefore, the purpose of metal artifact correction can be achieved. According to the computerized tomography (CT) image metal artifact correction method of the invention, the original projection data are adopted as a correction object, and therefore, the spatial resolution and low-contrast ability of a processed image can be ensured; and the original projection data completely contain all information of the interference object, and therefore, the introduction of a new artifact can be avoided.

Description

technical field [0001] The invention relates to a CT image correction method, in particular to a CT image metal artifact correction method, device and CT equipment. Background technique [0002] Computed tomography (Computerized Tomography, referred to as CT) is based on the different attenuation properties of different substances for rays. It uses radiation to irradiate the measured object from various directions, measures the intensity of rays passing through the object, and calculates it through a certain reconstruction algorithm. It is a radiological diagnostic technology that obtains the linear attenuation coefficient of each point inside the object for the ray, thereby obtaining the tomographic image of the measured object. The tomographic image reconstructed by CT has the advantages of no image overlap, high density and spatial resolution, so it has attracted much attention as a non-invasive medical diagnostic technology since its appearance. [0003] Based on the pr...

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Application Information

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IPC IPC(8): G06T5/00A61B6/03
Inventor 孙洪雨
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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