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Method for removing ring artifact in image

A ring artifact, in-image technology, applied in the field of medical image processing, can solve the problem that post-processing methods cannot be applied to eccentric original reconstructed images, etc.

Active Publication Date: 2014-06-04
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0007] The present invention provides a processing method for removing ring artifacts in CT images, so as to achieve the purpose of being applicable to CT images of arbitrary imaging centers, so as to solve the problem that existing post-processing methods cannot be applied to eccentric original reconstructed images

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  • Method for removing ring artifact in image
  • Method for removing ring artifact in image

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Embodiment Construction

[0083] In order to make the purpose, technical solution and advantages of the present invention more clear, the following will be further described in detail in conjunction with the accompanying drawings.

[0084] In order to facilitate the description of the frequency-domain deringing method applicable to any imaging center of the present invention, the basic idea of ​​the post-processing method is briefly described first.

[0085] The post-processing of removing ring artifacts in CT images is carried out on an image with ring artifacts. For the convenience of analysis, the image f(x, y) of the original Cartesian coordinate system with rings can be decomposed into Cartesian coordinates The sum of the acyclic image g(x, y) and the annulus image h(x, y) in Cartesian coordinates, ie

[0086] f(x,y)=g(x,y)+h(x,y) (1)

[0087] The purpose of deringing is to obtain g(x, y). The post-processing method is to first obtain the image h(x, y) of the ring in Cartesian coordinates, and th...

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Abstract

The invention discloses a method for removing a ring artifact in a CT image. The method comprises the following steps: in a rectangular coordinate domain, performing extension an original reconstruction image having the ring artifact to generate a first reconstruction image, the image construction center of the first reconstruction image being overlapped with the rotation center of a rack; converting the first reconstruction image into a second reconstruction image in a polar coordinate domain; in the polar coordinate domain, utilizing frequency domain filtering to process a second ring image extracted from the second reconstruction image; converting the second ring image into a third ring image in the rectangular coordinate domain; performing inverse extension on the third ring image to obtain a fourth ring image, of which the size is the same with that of the original reconstruction image; and removing the fourth ring image from the original reconstruction image having the ring artifact to obtain a ringless image in the rectangular coordinate domain. For any image construction center, the ring artifact can be removed by utilizing the method in the invention.

Description

technical field [0001] The invention relates to the technical field of medical image processing, in particular to a method for removing ring artifacts in images. Background technique [0002] In the current commercial CT (computed tomography), due to the nonlinear response of the pixel channel to the ray intensity, the inconsistency of the response of the pixel channel to the ray intensity, the nonlinear response of the pixel channel to the ray energy spectrum, the detector The instability of dark field and bright field, etc., will cause a kind of ring artifact in CT images. Ring artifacts greatly reduce the image quality of CT images. The specific performance is that ring artifacts seriously affect the accuracy of the Ct value of CT images (Ct value represents the attenuation value of X-rays after passing through the tissue and being absorbed.), affecting The uniformity of CT images will seriously affect clinical diagnosis, and even in some special cases, it will directly ...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 孙洪雨
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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