Study on the Dependence of Ultrasonic Phase Velocity on Pomsity, Frequency and Pmpagation Angle in Cancellous Bone

In the present study, the dependence of ultrasonic phase velocity on porosity and frequency in cancellous bone was predicted using the Biot model and the modified Biot-Attenborough (MBA) model for propagation in fluid-saturated porous media. It was also compared with previously published measurements in human and bovine cancellous bones in vitro. It was shown that the phase velocity in cancellous bone decreased with increasing porosity and frequency. The dependence of phase velocity on propagation angle in cancellous bone was predicted using the Schoenberg model together with the Biot model and the MBA model which were modified to include the effect of angle. The theoretical models used in the present study advance our understanding of the interaction between ultrasound and cancellous bone and can be expected to be usefully employed for the diagnosis of osteoporosis.