MEG device and method based on atomic magnetometer/magnetic gradiometer

Abstract

An atomic magnetometer / magnetic gradiometer comprises at least one detection gas chamber, wherein the detection gas chamber is filled with alkali metal vapor; a laser light source, which is used for emitting an excitation light beam and a detection light beam to irradiate the detection gas chamber, wherein the excitation light beam is used for enabling alkali metal vapor in the detection gas chamber to be polarized, and the detection light beam is used as polarized light to pass through the alkali metal vapor and then reach the polarization detection device; a modulation coil which is used forgenerating a modulation magnetic field with the known intensity for the alkali metal vapor; a polarization detection device which is used for receiving the detection light beam, and according to thepolarization angle change information of the to-be-measured magnetic field overlapped by the modulated magnetic field, the polarization angle change information of the light beam is detected, and of the detection light beam in a to-be-measured magnetic field subjected to superposition by the modulation magnetic field, acquiring detection signals of magnetic field intensity or magnetic field gradient of the to-be-measured magnetic field. The invention further provides a MEG device and method based on the atomic magnetometer / the magnetic gradiometer. The invention is based on a discrete atomicmagnetometer / the magnetic gradiometer, and realizes the detecting of the brain magnetic signals of the wearable multi-channel detection of MEG signals.

Description

technical field [0001] The invention relates to the technical field of magnetoencephalography, in particular to a magnetoencephalogram detection device and method based on an atomic magnetometer / magnetic gradiometer. Background technique [0002] Magnetoencephalography (MEG) is a method used to detect extremely weak magnetic signals produced by neural electrical activity in the brain. The time resolution of magnetoencephalography is very high, which can reach less than 1ms, and the magnetic signal related to high-frequency electrical activity will not be attenuated in the process of transmitting out of the brain. ) and extremely high spatial accuracy (the magnetic permeability of different human tissues is basically the same, and will not cause distortion to the magnetic field). Due to its high spatio-temporal resolution, magnetoencephalography is not only an effective technical means to study the mechanism of neural activity in the brain and clinical diagnosis of epilepsy ...

AI Technical Summary

Problems solved by technology

[0005] First of all, the rigid bracket used to carry the optical atomic magnetometer / magnetic gradiometer needs to be close to the shape of the human head to accurately position the atomic magnetometer / magnetic gradiometer. Each person's specific size and shape of the head needs to be adapted to rigid brackets of different sizes and shapes, which is costly; while a flexible bracket similar to an EEG cap structure will cause errors in the spatial position of the detector due to head movement

[0006] Secondly, at present, there is no real multi-channel parallel acquisition prototype, and there is no magnetometer, magnetic gradiometer detector scheme based on technology and technology that has matured and can be mass-produced. or detection method

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