Theoretical Consideration for a Multipole Probe in Electrocardiographic Studies

This paper describes the design of an active source capable of approximating the three independent dipole and five independent quadrupole source components. The entire system utilizes a physical arrangement of 11 ``point sources´´ located at the intersections of a cubical lattice. By an appropriate selection of point sources and sinks and by proper control of their relative strengths, each of the eight aforementioned source components can be excited.