Ring artifact elimination method for CBCT image

A ring artifact and image technology, applied in the field of medical image processing, can solve problems such as artifact persistence

Inactive Publication Date: 2016-02-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, due to the selection of parameters and the need to consider the balance between artifact removal and detail preservation, in the case of large ring artifact intensity changes, this method will cause artifacts to a certain extent.

Method used

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  • Ring artifact elimination method for CBCT image
  • Ring artifact elimination method for CBCT image
  • Ring artifact elimination method for CBCT image

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Embodiment

[0104] A total of four cone-beam CT images were used in the experiment, all of which were real human tissues taken by a CT machine that has been put into production. , these images are composed of a large number of human soft tissues and other parts, and there will be obvious ring artifacts, which are the key parts of the current industry research. For the convenience of processing, the four images are all 512*512 grayscale images, and in L 0 In the process of norm filtering, β 0 with beta max 2λ and 1E5 are uniformly used, the iteration rate is 2, and the filtering parameter λ needs to be adjusted within a certain range according to the filtering effect. Depend on image 3 , 4 It can be seen that CT images of the same part and the same angle can be processed with the same parameters and achieve good results; while for images of different parts with different angles, the filtering parameters need to be determined through experiments. It has been verified that this range i...

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Abstract

The invention relates to a ring artifact elimination method for a CBCT image and belongs to the field of medical image processing. According to the invention, firstly, the CBCT image with a ring artifact is transformed from a Cartesian coordinate system to a polar coordinate system; then the CT image P in the polar coordinate system is subjected to smoothing processing by adopting an L0 norm filtering method; next, a smooth image P' obtained after filtering is subtracted from an original image P in the polar coordinate system to obtain an artifact information image Pk with partial original detail information, then the Pk is subjected to extraction and removal of an artifact template by using an OSTU multi-threshold segmentation method and a median method, and the rest of detail information is compensated into the filtered image P'; and finally, the image P' compensated with the detail information is transformed to the Cartesian coordinate system, so that a cone-beam CT image without the ring artifact can be obtained. Compared with the prior art, when detail and edge information in the cone-beam CT image is reserved to the greatest extent, the ring artifact on the CT image, which influences image quality and reality, are effectively removed without obvious residues.

Description

technical field [0001] The invention relates to a method for eliminating ring artifacts in CBCT images, which belongs to the field of medical image processing. Background technique [0002] In recent years, cone-beam computed tomography (Cone-beam Computed Tomography) has been widely used in medical fields such as clinical diagnosis and 3D implants. As a type of tomography, cone-beam CT has many advantages such as accurate imaging and high utilization of rays. However, due to limitations of multiple factors such as system technology, design, and reconstruction algorithms, there are often a series of concentric rings with the reconstruction center as the center and gray values ​​that are different from surrounding pixels in cone-beam CT images, that is, ring artifacts. The appearance of ring artifact seriously affects the quality and authenticity of the image, and interferes with further clinical diagnosis and treatment. Therefore, how to remove the ring artifact without af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/10
CPCG06T5/002G06T5/10G06T2207/10081G06T2207/20182G06T2207/30016
Inventor 李建武毛欣蓓颜子夜霍其润
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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