1. An ultrasound system, comprising: a probe configured to successively acquire ultrasound information from an object along at least three distinct scan planes intersecting one another to form a common rotational axis, said scan planes each formed from ultrasound signals emitted from a surface of the probe using electronic steering, said common rotational axis extending from the surface of the probe; memory storing the ultrasound information acquired along the at least three distinct scan planes as data slices; a processor accessing said memory to obtain said data slices and generating ultrasound images corresponding to said data slices, wherein the processor comprises a plurality of display processors processing different ones of the data slices to produce corresponding two-dimensional images for said data slices; and a display co-displaying said ultrasound images formed from said data slices and a tri-plane three-dimensional (3D) image representative of said at least three scan planes while the probe is scanning.