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Method and device for correcting ring artifact

A technology of ring artifacts and images, which is applied in the field of medical image processing, can solve problems affecting image detail information, image deviation from objective images, and affecting doctors' judgment of objective images, etc.

Active Publication Date: 2017-05-10
SHENZHEN INST OF ADVANCED TECH
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Problems solved by technology

But this method is too dependent on the choice of parameters
Subsequently, in 2009, Chen.Y proposed a ring artifact correction method based on independent component analysis, but this method affected the details of the image
The existing post-processing technology based on the image domain, when identifying and correcting artifacts, easily destroys the original image details of the image, causing the corrected image to deviate from the objective image, and affecting the doctor's judgment on the objective image; in addition , Many post-processing techniques reduce the resolution of the image in the process of using polar coordinates to correct the image ring artifact, which is not suitable for clinical use

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  • Method and device for correcting ring artifact
  • Method and device for correcting ring artifact

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Embodiment Construction

[0030] In the case that the detector gain is not well calibrated and there are bad pixels, the cone beam CT (CBCT) image reconstructed by the FDK algorithm will produce serious ring artifacts, which destroys the detailed information of the image. Further, this It brings errors to operations such as radiotherapy positioning and industrial material inspection using CBCT. On the basis of not destroying the original image information, the application can effectively eliminate the ring artifact.

[0031] The present application will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

[0032] Please refer to figure 1 and figure 2 , the present application discloses a ring artifact correction method, the ring artifact correction method includes a coordinate conversion step S01, a processing step S03, a subtraction step S05, an extraction step S07, a judgment step S09, an iteration step S11 and a correction step S13, sp...

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Abstract

The invention discloses a method and a device for correcting a ring artifact. Polar coordinate conversion, related total variation processing, mid-value extraction and iterative correction are used for achieving iterative ring artifact correction. The method specifically comprises the steps of smoothening edge protection of an image by using the related total variation, thus acquiring detail and artifact images, and applying the images to the correction of the ring artifact; and continuously extracting the ring artifact by using the iterative correction method, thus achieving a ring artifact correction result of the image. According to the method and the device provided by the invention, during a process of removing the ring artifact, details of the original image are not damaged, and an image resolution ratio is not reduced, and a processing flow is simple; in addition, the ring artifact is only extracted in an image domain, so that the process is completely compatible with a clinic using process. The method and the device are more suitable for clinic application.

Description

technical field [0001] The present application relates to medical image processing technology, in particular to a ring artifact correction method and device. Background technique [0002] In medical diagnosis, it is often necessary to obtain an image by taking pictures of the affected area, and then analyze it. Among them, CBCT (cone beam CT, Cone beam Computer Tomography) technology has been widely used in many fields of medical diagnosis. Artifacts are an important factor that restricts the image quality of CBCT and affects clinical diagnosis, among which ring artifacts are the most serious. There are many reasons for ring artifacts, such as inconsistent response of detector elements on the detector. Ring artifacts appear on the CBCT image as a series of concentric rings with a certain width centered on the center of the CBCT image and the gray level is different from the surrounding pixels. The existence of ring artifacts brings a lot of troubles to the subsequent CBCT...

Claims

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/008
Inventor 梁晓坤谢耀钦张志诚
Owner SHENZHEN INST OF ADVANCED TECH
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