Residual noise cancellation of MRS signal based on frequency-domain symmetry

被引：0
|
作者：
Lin T. [1 ,2 ]
Li Y. [1 ]
Liu D. [1 ]
Wan L. [1 ,2 ]
机构：
[1] College of Instrumentation & Electrical Engineering, Jilin University, Changchun
[2] Key Laboratory of Geophysical Exploration Equipment, Ministry of Education, Changchun
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Data processing; Frequency-domain symmetry method; Magnetic resonance sounding; Residual noise;
D O I：
10.11817/j.issn.1672-7207.2021.10.013
中图分类号：
学科分类号：
摘要：
Based on the characteristics of magnetic resonance sounding(MRS) signal presented in frequency domain, a frequency-domain symmetry method used as a supplementary step of the traditional MRS-processing workflow was proposed to remove residual noise. Firstly, the noisy signal was demodulated in the frequency domain and decomposed into real and imaginary components in the time domain. Then, the real component of the powerline harmonic noise which was aliased with MRS signal in the time domain was estimated by using the distinctions of the frequency spectrum of the two components to be the same at the harmonic frequency and the opposite at the negative harmonic frequency. The real component of the powerline harmonic noise was discarded together with the imaginary time domain component to separate noise and signal. The results show that after eliminating residual noise using the frequency-domain symmetry method, the data signal-to-noise ratio increases from 15.29 dB to 19.33 dB, the initial amplitude extraction error decreases from 2.03% to 0.86%, and the relaxation time extraction error decreases from 5.53% to 2.27%. Compared with the traditional MRS-processing workflow, the frequency-domain symmetry method can further eliminate the residual noise and improve the signal SNR. © 2021, Central South University Press. All right reserved.
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页码：3494 / 3504
页数：10
相关论文
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