超音波の反射係数を用いた皮質骨の音響インピーダンス分布の測定

概要

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Ultrasonic reflection coefficient was measured to evaluate the distribution of acoustic impedance in cortical bone of bovine tibia. The reflection coefficient, which is defined as the amplitude ratio of reflected wave to incident wave, depends on difference in acoustic impedance at the interface. In this study, we measured the amplitude of reflected wave from surface of cortical bone sample sunk in saline solution. Prior to the measurement, spot size of ultrasonic beam at the focal point was measured for preparing the flattened area on the bone surface. To calculate the intensity of incident wave, the standard sample, whose acoustic impedance is known, is used. We examined suitability of several materials for a standard sample. Accuracy of this method was evaluated by comparing the results with the product of density and bulk wave velocity. We revealed that the acoustic impedance of the cortical bone can be measured with sufficient accuracy by preparing the flat spot on the bone surface.
社団法人日本機械学会の論文
1999-12-25