1. An apparatus for forming an ultrasound image of a target, comprising: an imaging chamber having a plurality of cylindrical rings, said plurality of cylindrical rings stacked in a vertical arrangement within an interior of said imaging chamber, each of said cylindrical rings having a plurality of omni-directional transceivers disposed thereon; a controller coupled to each of said omni-directional transceivers for selectively activating one of said omni-directional transceivers to transmit an acoustic wave at said target and a predetermined number of said omni-directional transceivers to receive acoustic waves reflected from said target, at least two of said receiving transceivers disposed on a different cylindrical ring such that said received acoustic waves form a cone-shaped beam; an imaging processing unit coupled to said plurality of omni-directional transceivers for processing said cone-shaped beam and for constructing a three-dimensional image of said target therefrom; and a display coupled to said image processing unit for exhibiting said three-dimensional image of said target.