Assessment of ultrasound scanners by acoustic signal injection.

A new technique has been introduced whereby test signals are injected acoustically into a diagnostic scanner under test--no direct electrical connection is therefore needed. A simple battery operated instrument has been produced which will operate with all types of imaging equipment and which is particularly suitable for the routine checking of velocity and caliper calibrations, the assessment of scale factors, measurement of dynamic range and the effect of signal processing options on grey-scale dynamic range and the effect of signal processing options on grey-scale behaviour and for the adjustment of display and hard copy units.