声激励影响人眼频率响应的有限元分析
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科技部国家重点研发项目(2018YFE0115700),国家自然科学基金项目(61465010),江西省自然科学基金项目(20192BAB207035)


Finite Element Analysis on Frequency Response of Human Eye under Acoustic Excitation
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    摘要:

    目的 研究声激励下激励源、眼内压以及材料参数对人眼频率响应的影响。方法 基于三维有限元全眼模型,根据人眼形变及应力分布结果,定量分析各参数对人眼频率响应的影响。结果 其他参数保持不变,只改变激励源的位置、大小,声激励源分别放在角膜正上方、偏45°处以及激励较大处,134 Hz时人眼共振幅值分别为35、48和133 μm;只改变眼内压时,第1阶共振频率几乎不受眼内压的影响,其他阶的共振频率随眼内压增大稍向左偏移;只改变巩膜弹性参数,人眼组织的共振频率随着巩膜弹性增大而增加。结论 激励源的位置和大小对人眼的共振频率无影响,但对共振幅值有较大影响;眼组织材料参数对人眼频率响应的影响较大;眼内压对共振频率的影响呈近似线性。研究结果为临床开发高性能的眼内压监测技术提供理论基础。

    Abstract:

    Objective To study the effects of excitation source, intraocular pressure and material parameters on frequency response of human eye under acoustic excitation. Methods Based on the three-dimensional (3D) finite element model of the whole eye, as well as the deformation and stress distribution of human eye, the effects of various parameters on frequency response of human eye were quantitatively analyzed. Results When other parameters were fixed and only the position and size of the excitation source changed, the amplitude at resonance of human eye (the acoustic excitation source was placed directly above the cornea, at an offset of 45°, and at larger excitation) at 134 Hz was 35, 48 and 133 μm, respectively. When only the intraocular pressure changed, the first-order resonance frequency was almost unaffected by the intraocular pressure, and the resonance frequencies of other orders would shift slightly to the left as the intraocular pressure increased. When only the scleral elastic parameters changed, the resonance frequency of eye tissues increased with the increase of the scleral elasticity. Conclusions The position and size of the excitation source have no effects on resonance frequency of human eye, but they have a greater effect on the resonance amplitude. The material parameters of human eye tissues have a greater effect on the frequency response, and there is a linear relationship between the intraocular pressure and resonance frequency. The results provide the theoretical basis for clinical development of high-performance intraocular pressure monitoring technology.

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方利华,陶兴明,马卫卫,杜瑞瑞,伏燕军.声激励影响人眼频率响应的有限元分析[J].医用生物力学,2021,36(2):271-276

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  • 收稿日期:2020-05-21
  • 最后修改日期:2020-07-28
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  • 在线发布日期: 2021-04-25
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