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Method and device for removing artifacts in images

A technology of image projection and projection, which is applied in the field of image processing, can solve problems such as poor motion artifact removal effect, failure to meet clinical needs, missed diagnosis or misdiagnosis, etc., to achieve good artifacts, remove artifacts, and avoid missed diagnosis and misdiagnosis Effect

Active Publication Date: 2020-03-31
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0004] In the prior art, the motion blur in the medical imaging system with high-speed rotation of the gantry is removed based on the two-dimensional projection image, and the estimation of the blur kernel is based on the spatial shift invariance, and the object is assumed to be a point placed at the isocenter , because the simplified model does not match the actual situation, the removal effect of motion artifacts in the projection image is poor, and then the projection image is used for reconstruction, and the quality of the reconstructed image is poor, which does not meet the actual clinical needs and easily leads to missed diagnosis or misdiagnosis

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  • Method and device for removing artifacts in images

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Embodiment 1

[0056] Step S101 is executed to obtain the system matrix of the CBCT system. In this embodiment, the actual test is performed on the phantom to obtain the spread function of the voxels in the phantom. Then, the system matrix is ​​obtained based on the diffusion function of the voxels in the phantom. The phantom is provided with a plurality of markers, and the phantom may be provided with a plurality of markers at different positions in a matrix of uniform material. The absorption coefficient of the markers is different from that of the substrate, so It is easier to distinguish the marker and the matrix in the collected projection image. The phantom may be a cylinder, a hexahedron, or the like. The material of the matrix in the phantom can be low atomic number materials such as PMMA, and the marker can be high atomic number materials such as tungsten, aluminum, and iron.

[0057] The size of the projection image of the marker in at least one dimension is smaller than the pixel s...

Embodiment 2

[0086] The difference between this embodiment and the first embodiment is that the method of obtaining the system matrix in this embodiment is different from that in the first embodiment. In the first embodiment, the system matrix of the system is obtained by actual measurement of the phantom, while in this embodiment, the system matrix of the system is obtained by analysis. In this embodiment, the CBCT system is still taken as an example for description. Generally speaking, in the CBCT system, half of the angle rotated during the exposure integration time of the imaging system is defined as the projection angle. In this embodiment, in order to obtain a system matrix that can include motion blur, the angle rotated during the exposure integration time of the imaging system Subdivide, that is, divide it by a preset angle, the preset angle is smaller than the projection angle, after subdividing the angle rotated by the CBCT imaging system during the exposure integration time, the ...

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Abstract

A method, device and medical imaging system for removing artifacts from an image. The method for removing artifacts from an image includes: obtaining a system matrix of the imaging system. The system matrix gives the i-th ray passing through j voxels. Finally, the blur factor corresponding to the i-th pixel imaged in the imaging unit and the pixels in the predetermined neighborhood centered on the i-th pixel is used; the system matrix is ​​used for the iterative reconstruction method to reconstruct to remove the blur in the image artifacts. The image quality reconstructed by applying the inventive technical solution is better, meets the actual clinical needs, and avoids missed diagnosis or misdiagnosis.

Description

Technical field [0001] The invention relates to the field of image processing, in particular to a method and device for removing artifacts in images. Background technique [0002] Motion blur is the effect of moving objects in the image. This phenomenon will be more obvious in the case of long time exposure or fast moving objects in the scene. Cone beam tomography (CBCT, Cone Beam Computed Tomography) imaging systems, such as C-arm imaging systems, during the imaging process, due to the rotation of the gantry, there is a movement of the light source relative to the imaging object, that is, motion artifacts. [0003] At present, the motion blur can be removed by the deconvolution method, and according to whether the blur kernel is known or not, it is divided into a blind deconvolution method and a non-blind deconvolution method. Whether it is a blind deconvolution method or a non-blind deconvolution method, it needs to be implemented by accurately estimating the blur kernel. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T2207/20201G06T5/73
Inventor 陈鸣之姬长胜杨宏成
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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