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A Cosine Integral-Based Method for Metal Trajectory Prediction and Artifact Removal in CT Images

A technology of metal traces and CT images, applied in the research and implementation of artifact removal methods, can solve problems such as slow speed, achieve good results and save time

Active Publication Date: 2015-11-18
BEIJING UNIV OF TECH
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Problems solved by technology

Aiming at the problem of slow metal artifact removal method, the present invention provides a metal trajectory prediction method based on cosine projection, and applies it to the metal artifact removal algorithm to greatly improve the efficiency of the metal artifact removal algorithm, with a view to Can be used in radiation therapy equipment

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  • A Cosine Integral-Based Method for Metal Trajectory Prediction and Artifact Removal in CT Images
  • A Cosine Integral-Based Method for Metal Trajectory Prediction and Artifact Removal in CT Images
  • A Cosine Integral-Based Method for Metal Trajectory Prediction and Artifact Removal in CT Images

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Embodiment Construction

[0054] 1) According to the tomographic scanning of a certain part of the human body by the CT machine, a piece of original scanning data is obtained, which is called the original sinogram S (such as image 3 It is an original sinogram of 855*984, with a total of 984 scanning angles and 855 detector channels), the value of the pixel in S is the attenuation degree of X-rays by the human tissue that the X-rays pass through in a certain scanning angle of the human slice , referred to as CT value, the unit is Hu.

[0055] 2) Input the sinogram S; according to the cosine projection relationship between the projection data between the sinogram and the tomographic image of the human body, the following cosine projection formula is defined:

[0056] Sino ( i ) = Num Channel 2 - Ratio * len * Cos ( ...

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Abstract

The invention relates to a CT (Computerized Tomography) image metal track prediction and artifact reduction method based on integral cosine. Aiming at metal area part cutting in a metal artifact reduction algorithm, compared with a common threshold algorithm which uses original sinogram data to reestablish images, then cuts an image domain into metal pixels and finally projects the cut metal pixels onto a sinogram domain to position a metal track, the CT image metal track prediction and artifact reduction method based on integral cosine firstly obtains various projection tracks according to a cosine projection relationship, projections on each track are added and values which are greater than a threshold are regarded as values corresponding to metal, so that the metal track is obtained. The CT image metal track prediction and artifact reduction method based on integral cosine has the advantages that the original images are not required to be reestablished, the time is greatly saved, the accurate positioning of metal areas in images is kept as much as possible and artifacts introduced in the reestablished images are ensured to be as few as possible. According to results, the CT image metal track prediction and artifact reduction method can be used in a metal artifact reduction algorithm of CT medical images and the metal artifact reduction effect of the repaired images is better.

Description

technical field [0001] The invention relates to metal artifact removal technology in the technical field of medical image processing, in particular to the research and implementation of a method for locating metal tracks based on CT original projection data, and then performing artifact removal. Background technique [0002] Since the first clinical computerized tomography device (Computerized Tomography, CT) came out in 1972, CT technology has developed rapidly, and its scanning range, speed, and imaging quality have been greatly improved, and its clinical application value has also become higher and higher. All of these rely on the high quality of CT imaging. However, it is unavoidable in clinical practice that patients carry or contain metals in their bodies, such as metal dentures, bra hooks, pins, cardiac pacemakers and human implanted prostheses. The high density of metals makes the attenuation coefficient of X-rays much larger than that of other human tissues, which c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T11/00
Inventor 毋立芳颜凤辉
Owner BEIJING UNIV OF TECH
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