Attenuation filter-based metal artifact removing mixed reconstruction method for CT images

A technology of attenuation filtering and CT images, which is applied in the field of CT image processing to eliminate metal artifacts. It can solve the problems of large amount of algorithm calculation, long reconstruction time and difficulty in practical use, and distortion of the area around the metal in the reconstructed image. It achieves small computational complexity, High practical value, the effect of removing metal artifacts

Inactive Publication Date: 2010-07-14
SHANGHAI WEIHONG ELECTRONICS TECH +1
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Problems solved by technology

[0004] The purpose of the present invention is to address the shortcomings of the current mainstream algorithms: the reconstruction image is distorted in

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  • Attenuation filter-based metal artifact removing mixed reconstruction method for CT images
  • Attenuation filter-based metal artifact removing mixed reconstruction method for CT images
  • Attenuation filter-based metal artifact removing mixed reconstruction method for CT images

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Embodiment Construction

[0011] The present invention will be further illustrated below through an implementation case.

[0012] As mentioned above, both the difference method and the hybrid method in the prior art remove the projection data of the metal region, and simply use the neighborhood interpolation data to replace the structure of the metal region. In the present invention, we try to keep this part of the data, and correct the projection data of the metal area through the linear attenuation technology, reduce its influence on the surrounding area in the filtering back projection algorithm, and then reduce the jump caused by the projection data through filtering. The streak artifacts, and finally compensate for the metal area. The main steps of the present invention are introduced below:

[0013] 1. Determine the metal projection area

[0014] The present invention uses parallel ray projection data P(m, n), m=1,...M, n=1,...N. M is the total number of detectors, and N is the total number of...

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Abstract

The invention discloses an attenuation filter-based metal artifact removing mixed reconstruction method for CT images. When a CT acquires data, if a scanned object contains a metal object with high absorption coefficients which comprises a tissue attenuation coefficient and a metal attenuation coefficient to cause projection data jump, the scanned object is considered to be destructive and should be corrected; thus, the metal artifact is greatly weakened during FPB reconstruction. The method comprises the following steps: after determining a metal projection area, performing adaptive attenuation adjustment and filter on the determined metal area; reconstructing an entire image through the FBP, performing EM iterative reconstruction on the metal area by using the primary projection data, and correcting the metal area after the adaptive attenuation filter and reconstruction; and compensating the metal projection area. The numerical simulation CT experiments prove that the method can effectively remove metal artifacts and well keep the information of the metal and the surrounding tissue of the metal. Particularly under the condition of multiple metal objects, the method has low calculation complexity and high practical value.

Description

technical field [0001] The invention relates to the technical field of CT image processing, in particular to the technical field of eliminating metal artifacts. Background technique [0002] During the process of CT data acquisition, if the scanned object contains a metal object with a high absorption coefficient, the projection data will change suddenly. The projection data consists of two parts: one part is the tissue attenuation coefficient. The other part is the attenuation coefficient of the metal. This part of the projection data is generally considered "destroyed" and should be corrected, so that the metal artifacts are greatly weakened when reconstructed by FPB. The difference method and the hybrid method both remove the projection data of the metal area, and simply use the neighborhood interpolation data to replace the tissue of the metal area, which cannot truly reflect the attenuation coefficient of the tissue covered by the metal area, so the reconstructed by the...

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Application Information

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IPC IPC(8): G06T5/00G06T11/00A61B6/03
Inventor 陈豫汤同奎
Owner SHANGHAI WEIHONG ELECTRONICS TECH
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