System and method for magnetic resonance imaging

A magnetic resonance imaging and image technology, which is applied in the directions of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and electron paramagnetic resonance measurement.

Active Publication Date: 2019-03-15
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Each echo signal may correspond to an echo time

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example 1

[0180] Figures 9-A to 9-C Three exemplary images generated from signals acquired from the brain with different image generation protocols according to some embodiments of the present application are shown. Such as Figure 9-A As shown, raw phase images were generated based on raw phase information from multi-channel imaging. The phase information on the scalp is then removed, and the next steps on phase calculation or phase processing will only be performed on the phase information on the brain. Such as Figure 9-B As shown, phase unwrapping is performed using the phase unwrapping method, and the phase warping artifacts are removed. Such as Figure 9-C As shown, the background field was removed using the background field effect removal method. After the phase is unwrapped and the background field removed, the residual phase information can be further processed, for example, a phase mask can be generated based on the residual phase information.

example 2

[0182] Figures 10-A to 10-E Five exemplary images generated from signals acquired from the brain with different image generation protocols according to some embodiments of the present application are shown. Such as Figure 10-A As shown, raw phase images were generated based on raw phase information from multi-channel imaging. High-pass filtering was performed (kernel size of the high-pass filter was 32×32), and there were residual phase warping artifacts above the nasal cavities (e.g. Figure 10-B shown). Such as Figure 10-C shown, based on Figure 10-B The phase images shown generate susceptibility-weighted images. Such as Figure 10-D As shown, the phase unwrapping was performed using the phase unwrapping method, and the background field was removed using the background field effect removal method. Phase information about the scalp was pre-removed prior to phase unwrapping and background field effects removal. Such as Figure 10-E shown, then, based on Figure 1...

example 3

[0184] Figure 11-A to 1 1-E shows three exemplary images or maps generated from signals acquired from the brain with different image generation protocols according to some embodiments of the present application. Such as Figure 11-A As shown, raw magnitude images were generated based on magnitude information from multi-channel imaging. Such as Figure 11-B As shown, a T2* magnitude map was generated based on incorporating T2* related information into the calculation. Such as Figure 11-C As shown, the average amplitude map is calculated based on the amplitude information of the signal. The raw magnitude image, the T2*magnitude map and / or the mean magnitude map may further be used to generate susceptibility-weighted images.

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Abstract

A system and method for magnetic resonance imaging is provided. The method includes acquiring a plurality of echo signals relating to a region of interest of a subject at a number of echo times; generating a plurality of phase images based on the plurality of echo signals; generating an unwrapped phase map by performing a phase unwrapping correction to the plurality of phase images; generating a virtual phase map based on the unwrapped phase map; determining a phase mask based on the virtual phase map; obtaining magnitude information of the plurality of echo signals; and generating a susceptibility weighted image based on the phase mask and the magnitude information.

Description

technical field [0001] The present application relates generally to Magnetic Resonance Imaging (MRI), and more particularly to systems and methods for Susceptibility Weighted Imaging (SWI) in MRI. Background technique [0002] Susceptibility-weighted imaging (SWI) is an imaging method that can enhance the contrast of different tissues presented in an image by combining phase and magnitude information. In traditional susceptibility weighted imaging, a single gradient echo sequence is used and only single echo signals are acquired with long echo times (TE). However, for some tissues with strong susceptibility (e.g., hemorrhages or cavities), high spatial frequency convoluted / wrapped phases may be generated, which may lead to image artifacts and distorted imaging contrast. Accordingly, it would be desirable to provide a system and method that improves imaging contrast of different tissues having different susceptibility. Contents of the invention [0003] According to a fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/56
CPCG01R33/481G01R33/4824G01R33/50G01R33/56G01R33/5602G01R33/5608G01R33/5616G01R33/5635G01R33/56545G01R33/56536A61B5/055G01R33/24G01R33/5613G01R33/5615G01R33/60G06T11/003
Inventor 叶永泉宗金光
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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