A Generalization of the Geselowitz Relationship Useful in Impedance Plethysmographic Field Calculations

The Geselowitz relationship, valid only for volumes of fixed geometry and static or quasi-static sources, is extended to volumes of fluctuating geometry and nonquasi-static sinusoidal sources. The special case of filamentous sinusoidal sources is considered and the Geselowitz relationship is regained for the case of a fixed volume conductor in a quasi-static or static field.