Different Types of Bone Fractures Observed by Terahertz Time-Domain Spectroscopy  

作　　者：Minghao Zhang Xianjia Meng Zhiyong Wang Chuanyong Qu Chuan Qu Donghui Fu 

机构地区：[1]Department of Mechanics,Tianjin University,Tianjin,300072,China [2]Tianjin Key Laboratory of Modern Engineering Mechanics,Tianjin,300072,China

出　　处：《Acta Mechanica Solida Sinica》2024年第3期468-477,共10页固体力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11972247 and 12372080).

摘　　要：Microcracks are common in compact bone,but their continued propagation can lead to macroscopic fractures.These microcracks cannot be visualized radiographically,necessitating alternative noninvasive methods to identify excessive microcracking and prevent fractures.In this study,terahertz time-domain spectroscopy(THz-TDS)was used to examine bone interiors near cracks resulting from loading in bovine tibia samples.Various loading configurations,such as impact,quasi-static loading,and fatigue loading,known to induce different types of micro-scale damage,were applied.The values of refractive index and absorption coefficient of the bone samples were then determined from the THz-TDS spectra acquired before loading and after fracture.The study revealed that different loading configurations led to varying terahertz optical coefficients associated with various types of bone fractures.Specifically,the refractive index notably increased under fatigue loading but remained relatively stable during quasi-static bending.The absorption coefficient of bone decreased only under fatigue loading.Furthermore,samples were subjected to axial and radial impacts without sustaining damage.Results indicated that in the undamaged state,the change in refractive index was smaller compared to after impact failure,while the change in absorption coefficient remained consistent after failure.Under radial impact loading,changes in refractive index and absorption coefficient were significantly more pronounced than under axial loading.Prior to loading,the measured value of refractive index was 2.72±0.11,and the absorption coefficient was 6.33±0.09 mm^(−1)at 0.5 THz.

关 键 词：Terahertz time-domain spectroscopy BONE MICRODAMAGE Noninvasive method 

分 类 号：O34[理学—固体力学]