1. A method for evaluating an organ in an individual in need thereof, comprising: a) receiving magnetic field data associated with said organ from an electromagnetic sensor; b) receiving an image of a slice of said organ; c) determining an electrical current value associated with said slice of said organ from said magnetic field data, wherein said electrical current value is determined in Ampere units or equivalent units of current measurement; d) determining a vector representing said electrical current value, wherein a magnitude of said vector comprises said electrical current value; e) identifying a position of said vector in reference to said slice of said organ; and f) overlaying said vector onto said image of said slice of said organ to generate an electrical current density map of said slice of said organ for use in evaluating said organ.