中国组织工程研究 ›› 2016, Vol. 20 ›› Issue (18): 2717-2724.doi: 10.3969/j.issn.2095-4344.2016.18.020

• 细胞损伤与修复动物模型 Animal models of cell injury and repair • 上一篇    下一篇

猫视乳头三维模型重建及有限元分析

高 伟1,2,杨昱童1,张诗瑶1,张昆亚1,2,刘志成1,2,钱秀清1,2   

  1. 1首都医科大学生物医学工程学院,北京市  100069;2临床生物力学应用基础研究北京市重点实验室,北京市  100069
  • 收稿日期:2016-03-08 出版日期:2016-04-29 发布日期:2016-04-29
  • 通讯作者: 钱秀清,博士,副教授,首都医科大学生物医学工程学院,北京市 100069; 临床生物力学应用基础研究北京市重点实验室,北京市 100069
  • 作者简介:高伟,男,1986年生,河北省邯郸市人,汉族,首都医科大学在读硕士,主要从事眼生物力学方面的研究。
  • 基金资助:

    国家自然科学基金(11102123,31570952);北京市自然科学基金(7142024)

Three-dimensional reconstruction and finite element analysis of the optic nerve head of a cat

Gao Wei1, 2, Yang Yu-tong1, Zhang Shi-yao1, Zhang Kun-ya1, 2, Liu Zhi-cheng1, 2, Qian Xiu-qing1, 2   

  1. 1School of Biomedical Engineering, Capital Medical University, Beijing 100069, China; 2Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Beijing 100069, China
  • Received:2016-03-08 Online:2016-04-29 Published:2016-04-29
  • Contact: Qian Xiu-qing, M.D., Associate professor, School of Biomedical Engineering, Capital Medical University, Beijing 100069, China; Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Beijing 100069, China
  • About author:Gao Wei, Studying for master’s degree, School of Biomedical Engineering, Capital Medical University,, Beijing 100069, China;Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application, Beijing 100069, China
  • Supported by:

    the National Natural Science Foundation of China, No. 11102123, No. 31570952; the Natural Science Foundation of Beijing, No. 7142024

摘要:

文章快速阅读:

 

文题释义:
三维重建:是指对三维物体建立起适合计算机表示和分析的数学模型。文章中三维重建主要是视乳头的三维重建,通过光学相干断层扫描技术获得视乳头的二维序列图,然后对二维序列图在空间中的位置进行较精确的定位,从而恢复出视乳头的三维场景信息实视乳头的三维重建。
有限元分析:是一种数值分析方法,即利用数学近似的方法对真实物理系统进行模拟,文章中通过光学相干断层扫描的方法建立眼底视乳头的三维模型,此模型可看成真实眼底结构的数学模型,然后导入有限元分析软件设定材料参数和边界条件,完成所需求的有限元分析。


背景:青光眼是一种以视野缺失为特征的不可逆性致盲眼疾病,临床研究表明,眼底视乳头组织早在视野缺失前已经发生了变化,而且视乳头中各组织的形态变化已经成为目前青光眼早期诊断以及确定病情发展的关键参考点,因此研究高眼压下视乳头各组织的形态变化具有重要的意义。

目的:建立包含筛板、视网膜和脉络膜的视乳头组织三维模型,分析急性高眼压下视乳头各组织的厚度变化。
方法:①选择健康家猫,排除屈光介质不清等各种眼疾,利用深度增强的频域相干光断层扫描成像技术获得猫在正常眼压下眼底视乳头组织的断层序列图。②分别获得视网膜、脉络膜和筛板的三维结构模型,并组装视乳头三维模型。利用有限元方法分析不同眼压下视网膜、脉络膜和筛板的厚度变化。③通过前房灌注的方法制造急性高眼压动物模型,利用深度增强的频域相干光断层扫描成像技术获得猫眼在不同眼压下的断层序列图。测量不同眼压下脉络膜、视网膜和筛板的厚度变化,并与有限元计算结果进行比较。
结果与结论:随着眼压的逐渐升高,脉络膜、视网膜和筛板呈变薄趋势,视乳头的杯盘比逐渐变大。而关于脉络膜、视网膜和筛板的厚度变化,测量结果与有限元计算的结果趋势程度相一致,因此利用光学相干断层扫描仪获得的断层序列图对眼底各组织进行三维重建来分析高眼压下眼底各组织的形态变化可行,用有限元分析的方法可以对眼底各组织在高眼压下的形态变化进行预测,这对确定青光眼的病程发展有一定的指导意义。
中国组织工程研究杂志出版内容重点:肾移植;肝移植;移植;心脏移植;组织移植;皮肤移植;皮瓣移植;血管移植;器官移植;组织工程
ORCID: 0000-0002-3105-1228(高伟)

关键词: 实验动物, 细胞损伤与修复模型, 有限元分析, 视网膜, 脉络膜, 筛板, 急性高眼压, 三维重建, 青光眼, 杯盘比;国家自然科学基金

Abstract:

BACKGROUND: Glaucoma is a kind of eye disease that can cause irreversible blindness which is characterized by visual field loss. Clinical research shows that the optic nerve head has changed before the visual field loss. The morphological changes of the optic nerve head have become the key to determine the early diagnosis of glaucoma and disease development. So it has important significance for us to study the morphological changes of the tissues of optic nerve head under the high intraocular pressure.

OBJECTIVE: To establish three-dimensional finite element model of optic nerve head which includes choroid, retina and lamina cribrosa, and analyze the thickness of the optic nerve head under the acute high intraocular pressure.
METHODS: (1) We chose healthy cats without refractive media and other eye diseases. The tomographic sequence images of the optic nerve head of a cat were obtained with the intraocular pressure of the normal value by using enhanced depth imaging spectral-domain optical coherence tomography. (2) The three- dimensional model of the retina, choroid and lamina cribrosa was obtained. Three-dimensional model of optic nerve head was established by assembling the model of the retina, the choroid and the lamina cribrosa. The thickness of the retina, choroid and lamina cribrosa was analyzed under different intraocular pressures by using the method of finite element analysis. (3) Animal model of acute ocular hypertension was established by methods of anterior chamber perfusion. The tomographic sequence images of the optic nerve head of a cat were obtained with different intraocular pressures by using enhanced depth imaging spectral-domain optical coherence tomography. Then, we measured the thickness changes of the choroid, retina and lamina cribrosa under different intraocular pressures, and compared with the results of finite element analysis.
RESULTS AND CONCLUSION: The thickness of the choroid, retina and lamina cribrosa trended to be thin, and the cup dish ratio of optic nerve head increased gradually with the increased intraocular pressures. Regarding to the thickness changes of the choroid, retina and lamina cribrosa, the trend of experimental measurement results was consistent with finite element calculation results. Hence, it is feasible to analyze morphological changes of every fundus tissue under high intraocular pressure using the tomographic sequence images obtained by optical coherence tomography. We can predict the morphological changes of the optic nerve head tissue by finite element analysis, which has certain guiding significance in determining the progression of glaucoma.
中国组织工程研究杂志出版内容重点:肾移植;肝移植;移植;心脏移植;组织移植;皮肤移植;皮瓣移植;血管移植;器官移植;组织工程

Key words: Finite Element Analysis, Intraocular Pressure, Glaucoma, Tissue Engineering