Abstract
Quantitative ultrasound (QUS) is a good method to measure elastic properties of bone (one indicator of bone quality) in vivo. Bovine cortical bone has two typical microstructures, plexiform and Haversian. In the nanoscopic level, bone consists of calcium phosphate, which forms incomplete hydroxyapatite (HAp) crystal. The preferred orientation of c‐axis of HAp crystallites induces anisotropy and inhomogeneity of elastic properties in bone. In this study, relationship between speed of sound (SOS) and HAp crystallites orientation in the axial direction were investigated in two foreign age bovine cortical bones. The dependence of attenuation on the anatomical position was also investigated. Two ring shaped cortical bone samples were made from 36 and 24‐month‐old bovine femur. SOS was measured by a conventional ultrasonic pulse system, using self‐made PVDF transducers. The integrated intensity of (0002) peak obtained using X‐ray diffraction was estimated to evaluate the amount of preferred orientation. Regardl...
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