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X-ray computed tomography (CT) metal artifact processing method

A metal artifact and processing method technology, applied in image data processing, 2D image generation, instruments, etc., can solve problems such as long iteration time, too much projection data, and difficulty in implementation.

Inactive Publication Date: 2013-05-15
SOUTHERN MEDICAL UNIVERSITY
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Problems solved by technology

[0005] The disadvantage of linear interpolation is that there will be long stripes at the fault, which are simultaneously tangent to the edge of the area where the absorption rate changes sharply and the boundary of the metal object. When the projection value changes sharply at the two ends of the gap, this Streaks are most noticeable and will affect the quality of the overall image
The iterative reconstruction method can suppress metal artifacts to a certain extent, but because iterative reconstruction often has many parameters to be adjusted, and the iteration time is long and the calculation is heavy, it is difficult to achieve clinically, and if there are too many missing projection data, iterative reconstruction will not not getting good results

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Embodiment 1

[0039] A method for processing X-ray CT metal artifacts, comprising the following steps in sequence.

[0040] (1) Obtain CT system parameters, metal-free projection data and metal-containing projection data in different scanning periods.

[0041] When the metal-free projection data and the metal-containing projection data are shifted in position, step (1) also includes registering the metal-free projection data with the metal-containing projection data using a data registration method .

[0042] (2) performing image reconstruction on the metal-containing projection data obtained in step (1) by using a CT reconstruction method, obtaining a metal-containing CT image, and performing segmentation processing on the obtained metal-containing CT image to obtain a metal image; The metal-containing projection data obtained in step (1) is segmented, and a position mark containing the metal-containing projection data is given according to the segmentation result.

[0043] Wherein, the ...

Embodiment 2

[0055] This embodiment describes in detail the specific implementation process of a method for processing X-ray CT metal artifacts of the present invention by taking the physical phantom data actually scanned by a Micro-CT as an example.

[0056] Such as figure 1 As shown, the implementation process of this embodiment is as follows.

[0057] (1) Obtain the system parameters of the Micro-CT machine, scan the physical phantom without metal to obtain the projection data without metal, then add a metal to the phantom, the position remains unchanged, and scan again to obtain the projection data containing metal data.

[0058] (2) For the metal-containing projection data acquired in step (1), use the method of filtered back projection to reconstruct the image as follows: figure 2 (b), it can be seen that figure 2 (b) Contains serious metal artifacts; the CT image is obtained and the threshold method is used for image segmentation to obtain a metal image.

[0059] The metal-con...

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Abstract

The invention discloses an X-ray computed tomography (CT) metal artifact processing method which includes the following steps. Firstly, system parameters of a CT machine, projection data including no metal of different scanning periods and projection data including metal are obtained. Secondly, image reconstruction is performed, a CT image with metal is segmented and a metal image is obtained. Meanwhile, position marks including the projection data corresponding to the metal are given. Thirdly, normalizing process is carried out and normalized projection data are generated. Fourthly, data interpolation processing is performed on the normalized projection data on position marks and project data undergone interpolation are obtained. Fifthly, normalization removing processing is carried out and interpolation projection data which undergo the normalization removing processing are obtained. Sixthly, images are reconstructed on the interpolation projection data which undergo the normalization removing processing and CT images without metal are obtained. Seventhly, the image including metal and a CT image without metal are combined to finally form a CT image. The X-ray computed tomography (CT) metal artifact processing method is simple in operation and capable of effectively eliminating a metal artifact of a CT image and maintaining details of a non-metal zone.

Description

technical field [0001] The invention relates to the technical field of image processing of medical images, in particular to a method for processing X-ray CT metal artifacts. Background technique [0002] In medical X-ray CT image diagnosis, artifacts of different shapes often appear, and these artifacts appear in different shapes in the image, which affects the accuracy of clinical diagnosis. Among them, the radial (streak) metal artifact produced by the high-density material carried by the patient is one of them. The direct cause of the typical Streak metal artifact is that the high-density material absorbs X-rays, which makes the projection data incomplete, so there is a serious data loss problem. [0003] In order to obtain high-quality CT images, metal artifacts need to be eliminated. Usually, post-processing method is used to eliminate metal artifacts. The main principle is that the operator first selects the target area, and then uses the data interpolation method to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06T5/00
Inventor 马建华张蕴婉黄静曾栋高杨陈武凡
Owner SOUTHERN MEDICAL UNIVERSITY
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