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http://dx.doi.org/10.7776/ASK.2011.30.1.056

Correlations of Phase Velocities of Guided Ultrasonic Waves with Cortical Thickness in Bovine Tibia  

Lee, Kang-Il (강원대학교 물리학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.30, no.1, 2011 , pp. 56-62 More about this Journal
Abstract
In the present study, the phase velocities of guided ultrasonic waves such as the first arriving signal (FAS) and the slow guided wave (SGW) propagating along the long axis on the 12 tubular cortical bone samples in vitro were measured and their correlations with the cortical thickness were investigated. The phase velocities of the FAS and the SGW were measured by using the axial transmission method in air with a pair of unfocused ultrasonic transducers with a diameter of 12.7 mm and a center frequency of 200 kHz. The phase velocity of the FAS measured at 200 kHz exhibited a very high negative correlation with the cortical thickness and that of the SGW arriving after the FAS showed a high positive correlation with the cortical thickness. The simple and multiple linear regression models with the phase velocities of the FAS and the SGW as independent variables and the cortical thickness as a dependent variable revealed that the coefficient of determination of the multiple linear regression model was higher than those of the simple linear regression models. The phase velocities of the FAS and the SGW measured at 200 kHz on the 12 tubular cortical bone samples were, respectively, consistent with those of the S0 and the A0 Lamb modes calculated at 200 kHz on the cortical bone plate.
Keywords
Osteoporosis; Tibia; Cortical bone; Cortical thickness; Guided ultrasonic wave; Phase velocity;
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