  A non-invasive functional-brain-imaging system based on
optically-pumped-magnetometers (OPM) is presented. The OPM-based
magnetoencephalography (MEG) system features 20 OPM channels conforming to the
subject's scalp. Due to proximity (12 mm) of the OPM channels to the brain, it
is anticipated that this MEG system offers an enhanced spatial resolution as it
can capture finer spatial features compared to traditional MEG systems
employing superconducting quantum interference device (SQUID). We have
conducted two MEG experiments on three subjects: somatosensory evoked magnetic
field (SEF) and auditory evoked magnetic field (AEF) using our OPM-based MEG
system and a commercial SQUID-based MEG system. We have cross validated the
robustness of our system by calculating the distance between the location of
the equivalent current dipole (ECD) yielded by our OPM-based MEG system and the
ECD location calculated by the commercial SQUID-based MEG system. We achieved
sub-centimeter accuracy for both SEF and AEF responses in all three subjects.
