Effect of Boundary Condition on the Two-Wave Propagation in Cancellous Bone

概要

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The two-wave phenomenon in a cancellous bone surrounded by a cortical bone was investigated using the specimens obtained from large mammals. Measurements were performed using laboratory-built poly(vinylidene fluoride) (PVDF) transducers excited by a one-cycle sinusoidal wave at 1 MHz. In addition to the experimental ultrasonic measurements, the finite-difference time-domain (FDTD) simulation was performed using the X-ray micro computed tomography (micro-CT) images (resolution: 48 μm) of the specimens. The clear separation of fast and slow waves was not seen in a specimen where the boundary of the cancellous and cortical bones was ambiguous. On the other hand, the clear separation of fast and slow waves was observed in a specimen where the boundary of cancellous and cortical bones was clear. These results indicate that the boundary characteristics between the cancellous and cortical bones strongly affect the two wave phenomenon. We should pay attention to this point in the case of <i>in vivo</i> assessment using this phenomenon.
2011-07-25