| 摘要 |
A method for measuring the speed of sound in a tissue such as bone. First, the transducer covers of a pair of transducer units are pressed together under a predetermined pressure, ultrasound is transmitted and received, and the time taken by the ultrasound to travel from one to the other of the transducers is measured. Next, the tissue is held between the pair of transducer units under the same predetermined pressure, ultrasound is transmitted and received, the time taken for the ultrasound to travel from one to the other of the transducers is measured, and the distance between the two transducers is measured. The speed of sound in the tissue is then computed based on the propagation time of ultrasound when the transducer units are directly pressed together, the propagation time of ultrasound and the distance between the transducers when the tissue is held between the pair of transducer units. By this method, an accurate value for the speed of sound in the tissue unaffected by changes in the properties of the acoustic matching material filling the transducer covers, can be computed.
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