A post-processing method and system for magnetic resonance susceptibility weighted imaging

Abstract

The invention discloses a magnetic-resonance magnetic susceptibility weighted imaging post-processing method and system, and the method comprises the steps: generating a local field change mask through local field change distribution; carrying out the filtering of original K space data through a low-pass filter, carrying out the dividing of the images before and after filtering, extracting image data, and generating a phase mask according to the range conversion rule of a positive phase combining two sides according to a preset rule, generating a final mask, combining with an amplitude image, and obtaining a magnetic susceptibility weighted image through N-th power weighting. According to the invention, the method employs the local field change distribution to generate the local field change mask, carries out the post-processing of a magnetic resonance image through combining the phase information of the image, reduces the artifacts at a tissue intersection in the image, solves a problem that a fine vein signal is lost because the artifacts are affected by a selected window width, and improves the detailed display of the magnetic susceptibility weighted image.

Description

technical field [0001] The invention relates to the technical field of susceptibility weighted imaging, in particular to a post-processing method and system for magnetic resonance susceptibility weighted imaging. Background technique [0002] Susceptibility weighted imaging is a new magnetic resonance imaging method proposed by Haccke. This method exploits differences in susceptibility between different tissues to generate image contrast. It can clearly display venous tissue, so it was originally called "High Resolution BOLD Venography (HRBV)". However, susceptibility-weighted imaging can not only show veins, but also has high sensitivity to paramagnetic substances such as deoxyhemoglobin, hemosiderin, ferritin and iron; in addition, it can also show the microvascular structure of tumors Brain changes that are not easily detected by conventional magnetic resonance imaging after trauma, trauma, and stroke. Therefore, susceptibility-weighted imaging is gradually applied to ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a post-processing method and system for magnetic resonance susceptibility weighted imaging, aiming at solving the problem that the post-processing method of susceptibility weighted imaging in the prior art mainly uses The high-pass filter removes low-frequency information containing background phase artifacts, which will be affected by the selected window width, causing the problem of losing useful signals

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