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A metal artifact correction method for multi-energy spectrum X-ray CT imaging

A metal artifact and CT imaging technology, applied in the direction of 2D image generation, image data processing, projection reproduction, etc., can solve difficult metal artifact correction and other problems, to overcome metal artifacts, facilitate clinical diagnosis and industrial non-destructive The effect of detection

Active Publication Date: 2019-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, due to the serious metal artifacts in the reconstructed image, it is difficult to accurately segment the metal image, which can only partially suppress the metal artifacts; furthermore, because the basic premise of conventional CT image reconstruction theory is that X-rays are monoenergetic , but in the actual imaging system, X-rays are continuous energy spectrum rays, so the above method is difficult to effectively correct metal artifacts

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  • A metal artifact correction method for multi-energy spectrum X-ray CT imaging

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0023] like figure 1 As shown, the present invention discloses a metal artifact correction method for multi-energy spectrum X-ray CT imaging. The metal artifact correction method of multi-energy spectrum CT images in the case of implanting gold markers in the patient's prostate is taken as an example to illustrate, The specific steps of calibration are as follows:

[0024] Step 1: Use a spectral CT detector (the number of energy segments is not less than 3) to perform multi-energy spectral CT projection to obtain a multi-energy spectral CT projection map with metal artifacts, and further determine that the base materials are soft tissue, bone tissue and gold ;

[0025] Step 2: According to the multi-energy spectrum CT projection map, use the projection weighted reconstruction algorithm or the image weighted reconstruction algorithm to obtain the ...

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Abstract

The invention discloses a metal artifact correction method for multi-energy spectrum X-ray CT imaging. Firstly, the multi-energy spectrum X-ray CT projection image containing the metal artifact is subjected to weighted image reconstruction and material decomposition to obtain a weighted reconstructed image I0, a projection image of a metal material and other base materials; then, the metal material image Im is reconstructed according to the projection image of the metal material as a priori knowledge in the subsequent iterative reconstruction process; a virtual monoenergetic projection patternPs is generated according to the projection patterns of all the decomposed base materials and their X-ray attenuation coefficients at a given energy; finally, using I0 as the initial image, Im as theprior knowledge of iterative image reconstruction and Ps as the target projection in the iterative process, the final metal artifact correction CT image is obtained by using the statistical iterativereconstruction algorithm.

Description

technical field [0001] The invention relates to the technical field of computerized tomography, in particular to a metal artifact correction method for multi-energy spectrum X-ray CT imaging. Background technique [0002] X-ray CT (Computed Tomography) has the advantages of fast imaging speed and high spatial resolution, and is widely used in medical diagnosis, industrial inspection and other fields. However, during CT imaging, due to the existence of metal materials (such as metal dentures) in the object under inspection, serious metal artifacts will be produced, manifested as stripe-like bright lines, dark bands or shadows, which will distort the CT image and seriously reduce the accuracy of the CT image. Quality, cover image details, is not conducive to medical accurate diagnosis and industrial high-precision detection and other applications, so it is necessary to correct metal artifacts. [0003] In the prior art, an interpolation method and an iterative method are gene...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/008
Inventor 周正东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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