| 摘要 |
<p>® A stand-off device for use with acoustic transducers is described having a liquid-filled chamber with a diaphragm portion which can be held against the body of a patient. The diaphragm is of such a thickness that reflections from its diaphragm/body interface (IB) and reflections from its liquid/diaphragm interface (IL) tend to cancel one another. The diaphragm material and the liquid (L) in the chamber are selected such that their acoustic impedances ensure cancellation of the reflected waves.</p> |
