In this work we employ the resonant ultrasound spectroscopy technique in time-domain to perform an explorative geometrical study of bone phantoms. We measured a set of acrylic tubes of equal length but with different internal diameters in order to make a first step study related to the decrease in wall thickness due to osteoporosis process in human bones. We considered the spectra obtained with the sample subjected to pressure and their development to the free body resonance frequency spectra.
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