骨小梁材料特性对超声背散射信号的影响
首发时间:2012-06-07
摘要:松质骨中超声传播特性的研究是骨超声领域的研究重点和难点之一。本文基于时域有限差分法(FDTD)建立松质骨的超声背散射仿真系统,研究骨小梁材料特性对超声背散射信号的影响。首次得到松质骨中的超声背散射系数(BSC)和积分背散射系数(IBC)随骨小梁材料参数(密度、拉梅常数、粘度系数及声阻抗系数)的变化关系。研究结果表明,IBC随骨小梁密度的增加而增加;BSC和IBC随拉梅常数的增加而增加、随第一粘度系数的增加而近似线性地减小,第二粘度的变化对背散射信号的影响很小;背散射参数随阻抗系数的增加而减小。说明松质骨中的超声背散射特性不仅受骨矿密度(BMD)和骨微结构的影响,还与骨小梁?的材料参数密切相关。本文的研究结果有利于理解松质骨中超声的背散射特性,对松质骨骨质状况的评价有一定帮助。
关键词: 超声波; 松质骨; 骨小梁材料; 时域有限差分法仿真; 超声背散射参数
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Effect of trabecular bone material properties on ultrasonic backscattering signals
Abstract:Ultrasound propagation in cancellous bones is an important and difficult topic in bone ultrasound field. In this study, ultrasonic backscattering simulation system was build based on finite difference time domain (FDTD) method, and the effect of trabecular material properties on ultrasonic backscattering in cancellous bones was analyzed. The backscatter coefficient (BSC) and integrated backscatter coefficient (IBC) were numerically investigated with varying trabecular bone material properties, such as density, lamé coefficients, viscosities, and resistance coefficients, for the first time. The results showed that IBC increases as the trabecular bone density increases. BSC and IBC increase with the lamé coefficients, but decrease as the first viscosity increases. However, change in the value of second viscosity has no significant impacts on the backscattering. Additionally, it was also found that ultrasonic backscatter parameters decrease with the increase of resistance coefficients. These phenomena illustrated that besides the bone mineral density (BMD) and microarchitecture, trabecular material properties significantly influence the ultrasonic backscattering in cancellous bones. This research is very helpful to understand ultrasonic backscattering in cancellous bones and can be used to assess the cancellous bone status.
Keywords: ultrasound cancellous bone trabeculae material FDTD simulation backscatter parameters
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