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A method and system for extracting parameters of magnetic resonance response signal of nuclear magnetic resonance water detector

A technology of response signal and parameter extraction, applied in the direction of electronic magnetic resonance/nuclear magnetic resonance detection, etc., can solve the problems of reducing the extraction accuracy of magnetic resonance response signals and the error of extraction results, and achieves the goal of removing noise, improving accuracy, and reducing computational complexity. Effect

Active Publication Date: 2019-02-26
JILIN UNIV
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Problems solved by technology

However, no matter which denoising method can only suppress the noise, it is impossible to completely eliminate the noise, which will inevitably bring errors to the extraction results, and the subsequent numerical fitting method will further generate errors, thus the two-stage error It will inevitably reduce the extraction accuracy of the parameters of the magnetic resonance response signal of the nuclear magnetic resonance water finder

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  • A method and system for extracting parameters of magnetic resonance response signal of nuclear magnetic resonance water detector
  • A method and system for extracting parameters of magnetic resonance response signal of nuclear magnetic resonance water detector
  • A method and system for extracting parameters of magnetic resonance response signal of nuclear magnetic resonance water detector

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[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0071] The two most critical parameters in the magnetic resonance response signal x(n) obtained by the nuclear magnetic resonance water finder are the average decay time T 2 and the initial amplitude E 0 . The present invention adopts total least squares (TLS, Total least squares) and rotation invariant parameter method (ESPRIT, Estimating Signal Parameter via Rotational Invariance Techniques) to extract the average decay time T 2 , using Fast Fourier Transf...

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Abstract

The invention discloses a method and system for extracting the parameters of a magnetic resonance response signal of a nuclear magnetic resonance water detector. The method comprises the steps: obtaining the magnetic resonance response data at N moments; respectively extracting the magnetic resonance response signal at the former (N-1) moments and the latter (N-1) moments to form two observation vectors; merging the two observation vectors, and forming an observation matrix; carrying out the calculation of the observation matrix through the combination of the total least square method and a rotation invariant parameter method, and obtaining a rotation operator, wherein the rotation operator is a function of mean attenuation time; obtaining the mean attenuation time through the rotation operator; converting the actual measurement magnetic resonance response signal data into a sine signal and noise form through the mean attenuation time; carrying out the fast Fourier transform of the sine signal, and obtaining an initial amplitude. The method and system improve the parameter extraction precision.

Description

technical field [0001] The invention relates to the field of magnetic resonance response signals, in particular to a method and system for extracting magnetic resonance response signal parameters of a nuclear magnetic resonance water finder. Background technique [0002] Water scarcity is a major problem worldwide. The 2015 Global Risks Report released at the 45th Davos World Economic Forum in 2015 pointed out that people's concerns about floods, droughts, water pollution and insufficient water supply have surpassed concerns about nuclear weapons or global diseases , the water crisis is already the number one risk factor in the world. [0003] Nuclear magnetic resonance groundwater detection technology is a non-destructive detection technology that directly finds water. Compared with the traditional geophysical method of groundwater exploration, the nuclear magnetic resonance groundwater detection technology has the advantages of high resolution, high efficiency, rich info...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/14
Inventor 于晓辉张鹏李新波孙晓东石屹然张志成
Owner JILIN UNIV
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