  In this paper we present a portable magnetocardiography device. The focus of
this development was delivering a rapid assessment of chest pain in an
emergency department. The aim was therefore to produce an inexpensive device
that could be rapidly deployed in a noisy unshielded ward environment. We found
that induction coil magnetometers with a coil design optimized for magnetic
field mapping possess sufficient sensitivity ($104fT/\sqrt{Hz}$ noise floor at
10Hz) and response ($813fT/\mu V$ at 10Hz) for cycle averaged
magnetocardiography and are able to measure depolarisation signals in an
unshielded environment. We were unable to observe repolarisation signals to a
reasonable fidelity. We present the design of the induction coil sensor array
and signal processing routine along with data demonstrating performance in a
hospital environment.
