Quantitative Ultrasound (QUS) techniques with the advantages of an axial transmission measurement were applied to implement an ultrasonic system for cortical bone evaluation. This evaluation is focused on the measurement and characterization of shear waves propagating in the axial direction of the cortical layer of bone. Signals were analyzed in time and frequency domains. And, in order to understand the wave propagation phenomenon, and predict experimental results, simulations using the elastic Finite-difference-time-domain (FDTD) method were implemented considering isotropic and anisotropic bone models. Additionally, shear wave velocities using the axial method were verified by a simple thought transmission measurement. / 博士(工学) / Doctor of Philosophy in Engineering / 同志社大学 / Doshisha University