1. A system to detect and measure an organ cavity comprising: an ultrasound transceiver positioned to deliver ultrasound energy of at least one of a fundamental and a harmonic frequency to the organ cavity and receive echoes of the at least one fundamental and harmonic frequency; an algorithm configured to signal process the received echoes according to the fundamental and harmonic frequency; and display means for presenting a visual depiction of the organ cavity and a calculated volume of the visual depiction.