Magnetic Field Mapping and Correction for Moving OP-MEG.

ABSTRACT:

Background

Optically pumped magnetometers (OPMs) have made moving, wearable magnetoencephalography (MEG) possible. The OPMs typically used for MEG require a low background magnetic field to operate, which is achieved using both passive and active magnetic shielding. However, the background magnetic field is never truly zero Tesla, and so the field at each of the OPMs changes as the participant moves. This leads to position and orientation dependent changes in the measurements, which manifest as low frequency artefacts in MEG data.

Objective

We model the spatial variation in the magnetic field and use the model to predict the movement artefact found in a dataset.

Methods

We demonstrate a method for modelling this field with a triaxial magnetometer, then show that we ca

SUBMITTER: Mellor S 

PROVIDER: S-EPMC7612292 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature