Ultrasonic frequency-dependent backscatter of dense bovine cancellous bone was modeled using a combination of two autocorrelation functions: a spherical distribution and a modified Gaussian function. The model was applied to approximate the changes of ultrasonic behaviour of bone during aging. An experimental model which can simulate physical changes that occur during aging was developed, by progressive decalcification, in order to evaluate the effects of change of mineral content and microstructure on ultrasonic properties of bovine cancellous bone. Linear regression, performed between trabecular thickness values and estimated from the model correlation lengths, showed significant linear correlation, with R~2=0.84 before and R~2=0.82 after demineralization. The accuracy of estimation was found to increase with trabecular thickness.
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