A method and device for magnetoencephalography compatible preamplification of electroencephalography

By designing a weak magnetic EEG preamplifier, the problem of EEG amplifiers interfering with magnetic brain signals was solved, and high-quality acquisition of EEG signals and synchronous acquisition of magnetic brain and EEG signals were achieved.

CN120713528BActive Publication Date: 2026-04-07PEKING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-23
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

In existing technologies, the magnetic components of the EEG preamplifier interfere with the acquisition of magnetoencephalogram (MEG) signals by the atomic magnetometer, making it difficult to achieve high-quality synchronous acquisition of MEG and EEG signals.

Method used

Design a magnetoencephalogram (MEG) compatible EEG preamplifier device, including a weak magnetic preamplifier circuit, an electrode distribution circuit, a main amplifier circuit, a power supply circuit, an analog-to-digital converter circuit, and a host computer. Utilize a weak magnetic connector and a low magnetic chip, and place it inside a magnetic shielding device to collect EEG signals at close range. Ensure signal quality through modular design and signal conditioning.

Benefits of technology

It achieves high-quality acquisition of EEG signals, reduces signal attenuation and interference, meets magnetic compatibility requirements, and supports simultaneous acquisition of EEG and magnetoencephalogram (MEG).

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Abstract

This invention discloses a magnetoencephalogram (MEG) compatible preamplifier method and device, which allows the MEG preamplifier to be placed within a magnetically shielded device. This invention achieves weak magnetism in the preamplifier circuit through the design of component selection and distribution; improves anti-interference capability and transmission stability by designing the MEG amplification factor and signal conditioning process; implements secondary amplification, power supply, and acquisition outside the magnetically shielded device, placing strongly magnetic components away from the weak magnetic environment to complete the entire acquisition process; and adopts a modular design, reducing the number of channels on each circuit board by distributing electrode channels, thereby reducing the size and facilitating the arrangement of the preamplifier system within the limited magnetically shielded space. This invention achieves weak magnetism in the preamplifier circuit, enabling high-quality brain-computer magnetic synchronous acquisition when placed within a magnetically shielded space.
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Citation Information

Patent Citations

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