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Method for removing Gibbs ring pseudo-image generated in MRI reconstruction process

A technology for magnetic resonance images and ring artifacts, which is applied in the directions of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and magnetic variable measurement. It can solve the problem of long reconstruction time and the influence of parameter selection. No solution is given, etc. problems, achieve high resolution, shorten reconstruction time, and high resolution

Inactive Publication Date: 2005-09-07
SOUTHERN MEDICAL UNIVERSITY
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Problems solved by technology

And compared with the traditional Fourier reconstruction method, the reconstruction time is too long
In "A Method for Reducing Gipps Ringing Artifacts While Preserving Tissue Marginal Integrity in Magnetic Resonance Scanning," Institute of Electrical and Electronics Engineers Journal of Image Processing Volume 4 2002 by Rick and Anne Effective Solved the problem of long reconstruction time of Gegenbauer method, but did not give a solution for the influence of parameter selection

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  • Method for removing Gibbs ring pseudo-image generated in MRI reconstruction process
  • Method for removing Gibbs ring pseudo-image generated in MRI reconstruction process
  • Method for removing Gibbs ring pseudo-image generated in MRI reconstruction process

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[0045] Below in conjunction with accompanying drawing, the present invention will be described in further detail,

[0046] Part of the original frequency-domain vector matrix data of the magnetic resonance image can be obtained directly from the magnetic resonance imaging system, or it can be obtained by performing Fourier transform simulation on the original template image. As shown in Figure 2, the original template image with a size of 256*256 is Fourier transformed to simulate the frequency-domain vector matrix data required for imaging, and the frequency-domain vector matrix data is symmetrically truncated to 60 rows of high-frequency data, and the missing data is 0 fill up. Then use part of the frequency-domain vector data to perform inverse Fourier transform to reconstruct the image to simulate the image containing Gibbs ring artifact. The correction of the artifact image follows the following steps in turn:

[0047] 1. Take the frequency encoding direction as the Kx ...

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Abstract

The invention discloses an eliminating method for Gibbs ring pseudoshadow when reconstructed MRI, and comprises steps as follows: (1) acquiring some data from K space; (2) transforming acquired vector array of original frequency domain; (3) filtrating and getting vector array data 2 of frequency domain from transmitted vector array data 1 of frequency domain; (4) taking edge detection using vector array data 2 of frequency domain; (5) rewriting the image function equation to imaging equation selected second type Chebyshev polynomial as basic functions; (6) by edge information from step (4), substituting vector array data 1 of frequency domain to imaging equation from step (5) in every continuous domain, obtaining needed image domain data array, then transmitting it to vector, resulting in corrected image. The invention can eliminate efficient Gibbs ring pseudoshadow, meantime ensures high resolution for reconstructed image.

Description

technical field [0001] The invention relates to a method for eliminating artifacts in magnetic resonance (MR) images, in particular to a method for eliminating Gibbs ring artifacts generated when partial K-space data is used to reconstruct magnetic resonance images. Background technique [0002] Because MR has the advantages of no radiation damage and high resolution, it is more and more widely used in clinical diagnosis. Fourier imaging methods are usually used in magnetic resonance imaging. Due to the limitations of imaging time and physics (mainly gradient strength), generally only a limited number of phase encodings can be performed to obtain limited raw data. Using Fourier transform to reconstruct the limited original data, the common Gibbs ring artifact will appear in the reconstructed image, which will bring uncertainty to the resolution of tissue details. [0003] It has positive significance for the reconstruction of magnetic resonance images using partial k-space ...

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Application Information

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IPC IPC(8): A61B5/055G01R33/48
Inventor 黄鑫冯衍秋陈武凡
Owner SOUTHERN MEDICAL UNIVERSITY
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