An integrated full-head OPM-MEG system based on 128 zero-field sensors.

Compact optically-pumped magnetometers (OPMs) are now commercially available with noise floors reaching 10 fT/Hz. However, to be used effectively for magnetoencephalography (MEG), dense arrays of these sensors are required to operate as an integrated turn-key system. In this study, we present the HEDscan, a 128-sensor OPM MEG system by FieldLine Medical, and evaluate its sensor performance with regard to bandwidth, linearity, and crosstalk.