基于CT图像构建听骨链三维有限元模型  

The establishment of finite element model of the middle ear based on CT images

作　　者：史长征[1] 吕长生[2] 李恒国[1] 

机构地区：[1]暨南大学附属第一医院医学影像中心,广东广州510630 [2]广州体育学院科学实验中心,广东广州510500

出　　处：《暨南大学学报（自然科学与医学版）》2011年第2期209-214,共6页Journal of Jinan University(Natural Science & Medicine Edition)

基　　金：广东省医学科研基金项目(A2010326)

摘　　要：目的：初步探讨中耳听骨链传声机制的力学特点。方法：采用1例听力正常者CT图像,建立中耳的三维有限元模型,进行中耳力学分析,观察不同频率下中耳主应变、主应力和位移的变化。结果：低频和中频中耳主应变、主应力变化较大,而在高频阶段变化并不明显,其中200 Hz和在1 000~2 000 Hz阶段变化最为明显,中耳主应力与主应变变化趋势相一致。当刺激音高于2 000 Hz时,中耳听骨链没有位移产生。结论：通过中耳有限元模型可以无创性地研究听骨链传声机制,有利于术前及术后对听骨链进行临床评估。Aim：To investigate the mechanical characteristics of the ossicular chain in the middle ear.Methods： The finite element model of the middle ear was established based on CT images of one normal hearing person.For the mechanical analysis,the principal strain,principal stress and displacement changes of ossicular chain of the middle ear at different frequencies were observed.Results： The principal strain,principal stress and the displacement changes in the low and intermediate frequency states were larger than those in the high-frequency state,especially in 200 Hz and 1000 Hz to 2 000 Hz stage,the change were most obvious.The principal stress and principal strain changed simultaneously,the ossicular chain was almost no displacement when the stimulus frequency greater than 2 000 Hz.Conclusion：The finite element model of the middle ear is a non-invasive way to study ossicular sound transmission mechanism,which is conducive to clinical assessment in the middle ear preoperative and postoperative stages.

关 键 词：听小骨 X线计算机 体层摄影术 有限元分析 生物力学 

分 类 号：R764.04[医药卫生—耳鼻咽喉科] R816.96[医药卫生—临床医学]