Abstract
Recently a computer-controlled scanning ultrasound imaging system was developed in our laboratory. It includes a pair of broadband 48-MHz focusing copolymer transducers. The apertures of the transducers and their f-numbers were identically equal to 2 mm and 2.25, respectively. A specimen can be moved in a 10-μm increment in its plane and its normal direction can be rotated along the ultrasound propagation direction. It can be used to produce transmission-mode shear-wave as well as longitudinal-wave images of solid specimens. Shear waves in solids were generated by mode conversion. The results of the longitudinal and shear-wave ultrasound images for a piece of compact bovine bone obtained using this system are presented. Shear-wave images combined with longitudinal images can provide a complete evaluation of elastic moduli of bone.
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