摘要
目的研究超声背散射信号及其背散射系数(backscattercoefficient,BSC)评价松质骨状况的可行性。方法首先建立了一种蜂窝状的松质骨理论模型,然后将BSC与频率的理论关系和牛胫骨松质骨实验结果进行了比较;最后实验分析了BSC与松质骨表观密度的关系。结果松质骨中超声BSC随入射频率的增加而非线性的增加,理论模型和实验结果是一致的。随松质骨表观密度的增大,BSC增大。结论在用超声评价松质骨状况时,背散射信号具有重要作用,其BSC可用于评价松质骨状况。
Objective To find a new means for assessment of cancellous bone. Method A cellular model describing the frequency dependence of ultrasonic backscattering coefficient （BSC） of trabecular bone was established. Then the relationship between BSC and frequency was obtained theoretically and compared with the results of experiment on cancellous bone （bovine tabiae） in vitro. Finally, the relationship between BSC and apparent density of cancellous bone was investigated experimentally. Result It was found that BSC is a non-linear function of frequency （increases with frequency）. A good agreement was obtained in averaged BSC of the experimental result and cellular model. And BSC also increases with increase of apparent density of the cancellous bone. Conclusion The backscattered ultrasonic signal is particularly important for assessment of cancellous bone, and BSC can be used in assessment of the status of cancellous bones.
出处
《航天医学与医学工程》
CAS
CSCD
北大核心
2005年第5期365-369,共5页
Space Medicine & Medical Engineering
基金
国家自然科学基金(10304003)
教育部博士点基金(20040246017)资助项目
关键词
超声
背散射系数
松质骨
表观密度
ultrasound
backscatter coefficient
cancellous bone
apparent density
