Bone properties determination from guided wave velocities: an in vitro test case studyReport as inadecuate

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* Corresponding author 1 LIP - Laboratoire d-Imagerie Paramétrique

Abstract : Ultrasonic guided mode propagation has been suggested as a mean for assessment of cortical bone properties such as porosity and thickness, through inverse procedure based on the identification of experimental guided wave spectrum wavenumber as function of frequency to a reference model. However, while a high number of unknowns stiffnesses, density, thickness must be determined, several factors inherent to measurement on bone such as absorption reduce the quantity of experimental data. Moreover, spatial variability of geometry and elasticity implies to develop dedicated measurement sequence to improve the robustness of stable experimental data. A feasibility study on an in vitro radius forearm is presented. Experimental signals were obtained using a probe dedicated to clinical use broadband 1 MHz signals associated with a dedicated signal processing efficient for dissipative materials. The reference model was a 2D transverse isotropic plate model with the bone material considered as a homogenized biphasic model bone matrix-porosity with elastic properties of the bone matrix a priori known. Estimated parameters were a thickness of 2.3 mm and stiffness coefficients in GPa of c11 = 29.4, c13 = 8.8, c33 = 18.3 and c55 = 5.4. Current works focus on the robustness and the accuracy of the technique.

Keywords : bone axial transmission guided wave

Author: Josquin Foiret - Jean-Gabriel Minonzio - Maryline Talmant - Pascal Laugier -



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