<p>An ultrasound calibrator apparatus and method for calibrating ultrasound equipment. The apparatus includes a pair of opposed bellows (41,43) oscillatorily transferring a fluent medium back and forth through a channel (47) with a well-defined cross-sectional area such that the flow velocity therethrough is known. A probe (116) in communication with ultrasound equipment (117) to be tested is submerged in a reservoir (45) which is situated in close proximity to the channel (47) such that the flow velocity can be measured therewith. The ultrasound equipment (117) is then adjusted to correct the discrepancies between the known and measured velocities so as to calibrate the ultrasound equipment.</p>
