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. 2023 Feb 3;5(3):157–169. doi: 10.1038/s42254-023-00558-3

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© Springer Nature Limited 2023, Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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Fig. 3 — a, Prototype wearable OPM-MEG. The subject can move their head during the measurement, as exemplified by the subject bouncing a tennis ball off a bat. b, Beta band oscillations recorded as a frequency spectrogram (left) and amplitude (right) during ball game and rest. c, Flexible wearable OPM-MEG helmet with 63 sensor mounts. d, SQUID-MEG (top) and OPM-MEG (bottom) recording of 11-year-old patient with refractory focal epilepsy. Left: superimposed data of multiple sensors showing filtered background brain activity and interictal epileptiform discharges (IEDs). Right: averaged IED data and magnetic field topography at the spike peak. e, OPM-magnetocardiography (MCG) measured at ambient conditions with a ⁸⁷Rb magnetic gradiometer. Parts a,b adapted with permission from ref. ⁴, Springer Nature Ltd. Part c adapted with permission from ref. ¹⁴⁹ under a Creative Commons licence CC BY 4.0. Part d adapted with permission from ref. ⁵³, RSNA. Part e adapted with permission from ref. ⁵¹, APS.