Biomagnetic imaging is the determination of electrical current flows, internal to the body, from measurements of the external magnetic fields these currents produce. In this paper we concentrate on factors that influence the use of mathematical estimation algorithms. It is these algorithms that produce the current images. We will ignore problems of data acquisition, assuming that all measurements are perfect and plentiful. We will further restrict our attention to formulations of magnetic-field generation and current-density reconstruction for linear, isotropic, shift invariant media.
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