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Method for electroencephalogram signal extraction under magnetic resonance environment

A technology of EEG signals and magnetic resonance, applied in the field of neural information, to improve effectiveness and robustness, reduce magnetic resonance gradient noise, and improve usability and quality

Active Publication Date: 2017-02-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, due to the limitations of the method, there is no recognized method for extracting EEG signals in the MRI environment that has been widely used. Therefore, in practical applications, the method should be designed according to the signal characteristics, that is, prior knowledge. How to obtain Prior knowledge is yet another problem, and this is where the difficulty in developing such methods lies

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  • Method for electroencephalogram signal extraction under magnetic resonance environment
  • Method for electroencephalogram signal extraction under magnetic resonance environment
  • Method for electroencephalogram signal extraction under magnetic resonance environment

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, a method for extracting EEG signals in a magnetic resonance environment includes the following steps:

[0024] A. Before turning on the MRI equipment, first use a 64-lead EEG measurement device to record an EEG signal to obtain a two-dimensional signal (number of leads × time sample point); figure 2 Show O 2 The 1.6-second long EEG signal data of the electrode is in the microvolt level; image 3 It shows the power spectrum characteristics of the signal, there are obvious EEG alpha waves, and there are corresponding 50Hz power frequency interference and frequency multiplication interference. Then turn on the magnetic resonance equipment, continuously and synchronously record the EEG signals, and obtain the two-dimensional EEG signals in the magnetic resonance environment;...

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Abstract

The invention belongs to the technical field of neural information, relates to an electroencephalogram signal extraction method and specifically provides a method for electroencephalogram signal extraction under a magnetic resonance environment. The method is used for improving efficiency and precision of extracting weak electroencephalogram signals, wide-band electroencephalogram information is reserved so that the electroencephalogram information can be widely used for clinical application and scientific research. According to the method, first electroencephalogram signals free of magnetic resonance interference are pre-recorded, the electroencephalogram signals under the magnetic resonance environment are recorded, magnetic resonance gradient noises and power line interference are sequentially removed through two-stage self-adaption noise offset, finally high-frequency noises are removed through a smoothing filter, and high-quality electroencephalogram signals are obtained. According to the electroencephalogram signal extraction method, the magnetic resonance gradient noises, the power line interference and the high-frequency noises of an instrument can be effectively removed, the high-quality electroencephalogram signals are extracted, and the signal extraction efficiency and precision are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of nerve information, and relates to a method for extracting electroencephalogram signals, in particular to a method for extracting electroencephalogram signals in a magnetic resonance environment. Background technique [0002] Spontaneous EEG is the spontaneous bioelectrical activity of brain cell populations that is non-invasively recorded at the scalp using sophisticated electronic equipment. ), susceptible to noise interference. At present, the analysis of spontaneous EEG is more focused on the power spectrum analysis of different frequency bands. In recent years, in order to make up for the spatial resolution of spontaneous EEG signals, EEG-MR signal synchronous recording equipment is used to simultaneously collect EEG signals and MRI signals. The MR signals are fused with each other to obtain more accurate measurements. [0003] However, in the EEG-MRI synchronous recording, the magnetic field of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0476A61B5/055
CPCA61B5/055A61B5/7203A61B5/7221A61B5/7225A61B5/369
Inventor 李凌于邦雷杨平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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