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Inverse diffusion method for eliminating Gibbs annular artifact of magnetic resonance image

A magnetic resonance image and ring artifact technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of artifacts, resolution drop, blurred edges of reconstructed images, etc., to eliminate artifacts and achieve fast processing speed. , the correction result is good

Inactive Publication Date: 2012-01-04
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method will reduce the overall resolution of the image, resulting in the blurring of the edges of the reconstructed image, and there are still artifacts at the edges

Method used

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  • Inverse diffusion method for eliminating Gibbs annular artifact of magnetic resonance image
  • Inverse diffusion method for eliminating Gibbs annular artifact of magnetic resonance image
  • Inverse diffusion method for eliminating Gibbs annular artifact of magnetic resonance image

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Embodiment Construction

[0035] figure 1 The specific flow of the method of the present invention is shown, and the processing process of the method of the present invention is described in detail below in conjunction with MR sequence images, and the specific steps are as follows:

[0036] Step 1: Read in the reconstructed MR artifact data, and calculate the gradient of each pixel in the horizontal and vertical directions: Calculate the value of the partial derivative of each pixel.

[0037] ∂ f ∂ x = y i + 1 , j t - y ij t

[0038] ∂ f ∂ y = y i , ...

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Abstract

The invention discloses an inverse dispersion method for eliminating a Gibbs annular artifact of a magnetic resonance image. The method comprises the following steps of: reading an MR artifact image acquired through magnetic resonance imaging; calculating the gradient of each pixel from the image data and inversely diffusing the grey values of all pixels along the gradient direction; forming limiting conditions of grey value diffusion so as to make the whole diffusion process capable of adaptively adjusting the diffusion speed and to guarantee the stability of the whole diffusion process; obtaining the directional diffuseness of a diffusion equation which progresses the grey value; and updating the grey values of the pixels to acquire the corrected MR image. A high-quality image can be acquired by performing data correction on the artifact generated by cutting of the k space data.

Description

technical field [0001] The invention relates to a post-processing method of MR images. In particular, it relates to an inverse diffusion method for eliminating Gibbs ring artifacts in magnetic resonance images. Background technique [0002] Magnetic resonance imaging plays an increasingly important role in clinical diagnosis because of its non-radiation, multi-parameter imaging, rich tissue contrast characteristics, and sensitivity to early lesions. However, it takes a long time to scan. In clinical applications, The data sampling time is often shortened by reducing the number of phase encodings under the premise of maintaining an appropriate signal-to-noise ratio, so some high-frequency data will be lost. Gibbs ring artifacts are introduced when Fourier reconstruction is performed with only limited frequency range k-space data. The data in the central region (low frequency region) of K space determines the contrast of the MR image, while the discarded part of the edge reg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 张煜彭莹莹
Owner SOUTHERN MEDICAL UNIVERSITY
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