ArticleSensors (Basel, Switzerland)2022
Calibration and Localization of Optically Pumped Magnetometers Using Electromagnetic Coils.
Article in Sensors (Basel, Switzerland), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.
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Who cites it
19 citing papers in PubMed.
- Spatial-Jitter Model for Magnetoencephalography Sensor Arrays.IEEE transactions on medical imaging · 2026Article
- Effects of Inverse Solutions and Calibration Errors on Localization Performance of OPM-MEG.Annals of biomedical engineering · 2026Article
- Revolutionizing Pediatric Neurophysiology With Magnetoencephalography.Psychophysiology · 2026Review
- A Single-Cell Optically Pumped Intrinsic Gradiometer.Sensors (Basel, Switzerland) · 2026Article
- In Situ Calibration Method for an MGT Detection System Based on Helmholtz Coils.Sensors (Basel, Switzerland) · 2025Article
- Accurate OPM-MEG Co-Registration via Magnetic Dipole-Based Sensor Localization with Rigid Coil Structures and Optical Direction Constraints.Bioengineering (Basel, Switzerland) · 2025Article
- A Sensor Localization and Orientation Method for OPM-MEG Based on Rigid Coil Structures and Magnetic Dipole Fitting Models.Bioengineering (Basel, Switzerland) · 2025Article
- Optimization and Analysis of Tangential Component Orientations in OPM-MEG Sensor Array.Bioengineering (Basel, Switzerland) · 2025Article
- Phantom-Based Approach for Comparing Conventional and Optically Pumped Magnetometer Magnetoencephalography Systems.Sensors (Basel, Switzerland) · 2025Article
- Wearable Magnetoencephalography in a Lightly Shielded Environment.IEEE transactions on bio-medical engineering · 2025Article
- Towards a 384-channel magnetoencephalography system based on optically pumped magnetometers.Imaging neuroscience (Cambridge, Mass.) · 2025Article
- Determining sensor geometry and gain in a wearable MEG system.Imaging neuroscience (Cambridge, Mass.) · 2025Article
- Pushing the boundaries of MEG based on optically pumped magnetometers towards early human life.Imaging neuroscience (Cambridge, Mass.) · 2025Article
- An Iterative Implementation of the Signal Space Separation Method for Magnetoencephalography Systems with Low Channel Counts.Sensors (Basel, Switzerland) · 2023Article
- Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding.NeuroImage · 2023Article
- Magnetoencephalography with optically pumped magnetometers (OPM-MEG): the next generation of functional neuroimaging.Trends in neurosciences · 2022Review
- OMMR: Co-registration toolbox of OPM-MEG and MRI.Frontiers in neuroscience · 2022Article
- Quantum enabled functional neuroimaging: the why and how of magnetoencephalography using optically pumped magnetometers.Contemporary physics · 2022Article
- Channel gain calibrated signal space projection using variational Bayesian estimation for optically pumped magnetometers.Imaging neuroscience (Cambridge, Mass.)Article
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Authors and funding
9 authors.
Funding
Abstract
In this paper, we propose a method to estimate the position, orientation, and gain of a magnetic field sensor using a set of (large) electromagnetic coils. We apply the method for calibrating an array of optically pumped magnetometers (OPMs) for magnetoencephalography (MEG). We first measure the magnetic fields of the coils at multiple known positions using a well-calibrated triaxial magnetometer, and model these discreetly sampled fields using vector spherical harmonics (VSH) functions. We then localize and calibrate an OPM by minimizing the sum of squared errors between the model signals and the OPM responses to the coil fields. We show that by using homogeneous and first-order gradient fields, the OPM sensor parameters (gain, position, and orientation) can be obtained from a set of linear equations with pseudo-inverses of two matrices. The currents that should be applied to the coils for approximating these low-order field components can be determined based on the VSH models. Computationally simple initial estimates of the OPM sensor parameters follow. As a first test of the method, we placed a fluxgate magnetometer at multiple positions and estimated the RMS position, orientation, and gain errors of the method to be 1.0 mm, 0.2°, and 0.8%, respectively. Lastly, we calibrated a 48-channel OPM array. The accuracy of the OPM calibration was tested by using the OPM array to localize magnetic dipoles in a phantom, which resulted in an average dipole position error of 3.3 mm. The results demonstrate the feasibility of using electromagnetic coils to calibrate and localize OPMs for MEG.
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