Abstract: An apparatus and process for making biomagnetic measurements of a biological organism permits the internal sources of the activity to be identified. An array of dipole sources is identified by providing a plurality of biomagnetic sensors disposed at locations external to the biological organism, measuring a measured biomagnetic response at each of the sensors, and amplifying and filtering the measured biomagnetic response. A solution of dipole sources within the biological organism is determined by forward calculating a computed biomagnetic response at each of the sensors resulting from the biomagnetic activity of a plurality of dipole sources, each of which dipole sources contributes a normalized total signal strength at the sensors, and solving for the strengths of each of the dipole sources by a minimum norm estimation procedure.