Statistics-based method for improving one-dimensional spectral signal-to-noise ratio of nuclear magnetic resonance

A kind of nuclear magnetic resonance and signal-to-noise ratio technology, which is used in magnetic resonance measurement, measurement using nuclear magnetic resonance imaging system, measurement of magnetic variables, etc. Line broadening effect, signal-to-noise ratio improvement effect

Active Publication Date: 2017-03-22
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI +1
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Problems solved by technology

According to the linear characteristics of the exponential decay of the NMR time-domain FID (Free Induction Decay) signal, the FID signal is windowed (such as an exponential window) to improve the signal-to-noise ratio of the FID corresponding spectrum. At the same time, the resolution of the spectrum is reduced; the wavelet transform (Trbovic N, Dancea F, Using wavelet de-noisedspectra in NMR screening. Journal of magnetic resonance2005, 173 (2)) can decompose the NMR signal into different frequencies components, and then use the high-frequency characteristics of the noise to separate the noise from the nuclear magnetic signal, so that the signal-to-noise ratio of the spectrum is improved, but this method still loses part of the detailed information of the nuclear magnetic signal

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  • Statistics-based method for improving one-dimensional spectral signal-to-noise ratio of nuclear magnetic resonance
  • Statistics-based method for improving one-dimensional spectral signal-to-noise ratio of nuclear magnetic resonance
  • Statistics-based method for improving one-dimensional spectral signal-to-noise ratio of nuclear magnetic resonance

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Embodiment 1

[0039] A method for improving the signal-to-noise ratio of one-dimensional nuclear magnetic resonance spectrum based on statistics, the overall flow chart is as follows figure 1 As shown, the method generally includes the following steps:

[0040]Step 1, the nuclear magnetic resonance instrument loads the set pulse sequence and sampling parameters, and performs multiple scans and acquisitions on the nuclear magnetic resonance FID signal; (in this embodiment: the pulse sequence is a single pulse, and the sampling parameters mainly include the observation core = 13 C, spectral width sw=30kHz, sampling time acqutime=1s, number of sampling points=30k)

[0041] Step 2, saving the nuclear magnetic resonance FID signals collected by each scan in step 1 respectively;

[0042] Step 3, perform Fourier transform on the nuclear magnetic resonance FID signal corresponding to each scan in step 2, obtain the corresponding spectral data of each scan and form a two-dimensional array Spec(n, m...

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Abstract

The invention discloses a statistics-based method for improving a one-dimensional spectral signal-to-noise ratio of nuclear magnetic resonance. On the basis of different statistic features of a noise region and a signal peak region of a nuclear magnetic resonance spectrogram, variable coefficients of the spectrogram at different positions are calculated to obtain a weighted array; and the weighted array is applied to spectrum data, so that the signal-to-noise ratio is improved.

Description

technical field [0001] The invention relates to a method for improving the signal-to-noise ratio of nuclear magnetic resonance, in particular to a method for improving the signal-to-noise ratio of nuclear magnetic resonance one-dimensional spectrum based on statistics, which is suitable for improving the signal-to-noise ratio of nuclear magnetic resonance spectra. Background technique [0002] Since the discovery of the phenomenon of nuclear magnetic resonance (NMR) in the middle of the 20th century, it has been widely used in natural science researches such as physics, chemistry, biology, medical diagnosis, and oil and gas prospecting. However, low sensitivity has always been an important factor restricting the further development of NMR. [0003] In order to improve the sensitivity of NMR signals, scientists have made improvements from different aspects. Dynamic nuclear polarization (Ardenkjaer-Larsen JH.Increase in signal-to-noise ratio of>10,000times in liquid-state ...

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Application Information

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IPC IPC(8): G01R33/56
CPCG01R33/5608
Inventor 刘造宋侃李正刚
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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