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Method for extracting weak signal of magnetic resonance spectrum overlap and device thereof

A weak signal, magnetic resonance technology, applied in magnetic resonance measurement, measurement using nuclear magnetic resonance image system, measurement using magnetic variables, etc., can solve problems such as affecting judgment

Inactive Publication Date: 2012-07-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disordered oscillatory waves near the discontinuity will be intertwined with the small signal to be analyzed, affecting judgment

Method used

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  • Method for extracting weak signal of magnetic resonance spectrum overlap and device thereof
  • Method for extracting weak signal of magnetic resonance spectrum overlap and device thereof
  • Method for extracting weak signal of magnetic resonance spectrum overlap and device thereof

Examples

Experimental program
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Embodiment

[0045] In this embodiment, the magnetic resonance spectrum signal FID is formed by superimposing a group of complex sinusoidal signals, which is usually described by the Lorentzian model, and the formula is as follows:

[0046] y l ( t ) = y + e ^ l = Σ k = 1 K a k · e j φ k · e ( - d k + j 2 π f k ...

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Abstract

The invention relates to a method for extracting a weak signal of magnetic resonance spectrum overlap and a device thereof. The method comprises the following steps of: carrying out cycle spinning for an overlapped peak signal, and carrying out orthogonal wavelet transform for a result after every spinning; carrying out threshold processing of a wavelet coefficient for a result of every wavelet transform, and setting the wavelet coefficient of a small peak to be 0; carrying out inverse wavelet transform for the wavelet coefficient after every processing to realize reconstruction for a high and wide peak, wherein the reconstructed high and wide peak does not contain the small peak overlapped on the high and wide peak; carrying out inverse cycle spinning for a result of every inverse transform and averaging, and obtaining a pure high and wide peak component without a small peak component; and in the overlapped peak signal, removing the high and wide peak component, and therefore showing the small peak component. According to the method, an oscillation peak brought by an ordinary wavelet threshold method can be effectively restrained. The method has the characteristics of high accuracy, good repeatability, high arithmetic speed and the like.

Description

technical field [0001] The invention relates to a method and a device for extracting signals, in particular to a method and a device for extracting weak overlapping signals of magnetic resonance spectra. Background technique [0002] At present, proton magnetic resonance spectroscopy (1H-MRS) can observe human metabolites in vivo, but due to the limitation of the magnetic resonance scanner field strength currently used in clinical practice, in actual clinical nuclear magnetic resonance spectroscopy (MRS), often encounter It is difficult to identify and extract small peaks overlapping high and broad peaks. At present, there are two main ways to deal with such overlapping small peaks: one is to develop the corresponding pulse sequence and develop the corresponding spectrum editing technology, and the other is to use two-dimensional spectrum technology. The development of corresponding pulse sequence and spectrum editing technology can only target specific metabolite component...

Claims

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Application Information

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IPC IPC(8): G01R33/54
Inventor 全红蒋刚王成杨志勇任雯廷
Owner WUHAN UNIV
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