The use of optically pumped magnetometers (OPMs) has provided a feasible. moveable and wearable alternative to superconducting detectors for magnetoencephalography (MEG) measurements. Recently. the widely used beamformer imaging technique has greatly improved spatial accuracy of MEG in the field of source reconstruction of neuroimaging. https://www.roneverhart.com/Donitsirauta-MDI-Donut-900/