For MDEIT, a small array of single-axis optically pumped magnetometers oriented normal to the scalp provides the best image quality, and larger vapour cells improve performance.
Impedance changes recorded with scalp electrodes during visual evoked responses: Implications for Electrical Impedance Tomography of fast neural activity,
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Optimisation of Magnetic Field Sensing with Optically Pumped Magnetometers for Magnetic Detection Electrical Impedance Tomography
For MDEIT, a small array of single-axis optically pumped magnetometers oriented normal to the scalp provides the best image quality, and larger vapour cells improve performance.