中国组织工程研究

• 组织构建基础实验 basic experiments in tissue construction • 上一篇    下一篇

三维有限元模型力学分析可预测视乳头的形状变化

祁昕征,魏  超,杨佳燕,穆  晶,张昆亚,刘志成,钱秀清   

  1. 首都医科大学生物医学工程学院,北京市  100069
  • 修回日期:2013-11-09 出版日期:2013-12-10 发布日期:2013-12-10
  • 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 qianxq@ccmu.edu.cn
  • 作者简介:祁昕征,女,1992年生,山东省聊城市人,汉族,2013年首都医科大学毕业,主要从事生物力学方面的研究。 Qi.xinzheng@163.com
  • 基金资助:

    国家自然科学基金(11102123, 31070840)**;北京市教育委员会科技计划面上项目(KM201110025009)*;北京市属市管高校人才强教计划资助项目(PHR201008398, PHR201110506)**

Shape variation of optic nerve head by mechanical analysis using three-dimensional finite element model

Qi Xin-zheng, Wei Chao, Yang Jia-yan, Mu Jing, Zhang Kun-ya, Liu Zhi-cheng, Qian Xiu-qing   

  1. School of Biomedical Engineering, Capital Medical University, Beijing  100069, China
  • Revised:2013-11-09 Online:2013-12-10 Published:2013-12-10
  • Contact: Qian Xiu-qing, Ph.D., Associate professor, School of Biomedical Engineering, Capital Medical University, Beijing 100069, China qianxq@ccmu.edu.cne
  • About author:Qi Xin-zheng, School of Biomedical Engineering, Capital Medical University, Beijing 100069, China Qi.xinzheng@163.com
  • Supported by:

    the National Natural Science Foundation of China, No. 11102123*, 31070840*; Scientific General Program of Beijing Municipal Education Commission, No. KM201110025009*; Funding Program for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality of China, No.      PHR201008398*, PHR201110506*

摘要:

背景:视乳头形状变化的准确测量及预测是青光眼的早期诊断及病程预测的关键,因此高眼压下视乳头形状的测量与分析具有重要意义。
目的:建立视乳头三维有限元模型,并分析急性高眼压下视乳头形状及视网膜厚度的变化。
方法:利用前房灌注的方法建立急性高眼压动物模型,利用光相干断层扫描仪获得猫在正常眼压及5 320,    7 980,10 640,13 300,15 960 Pa眼压时的断层图片,测量视网膜特征点处厚度的变化;基于正常眼压猫眼视乳头的断层数据,利用MIMICS软件获得视网膜及脉络膜的三维结构,并进行组装获得视乳头三维模型;利用有限元软件ABAQUS分析高眼压状态下视乳头的形状变化及视网膜厚度变化,并与实验测试结果进行比较。
结果与结论:随着眼压的升高,发现视网膜厚度逐渐变薄,视乳头深度及视乳头宽度均逐渐增加,视乳头宽度与深度的比值也逐渐增加。提示急性高眼压导致视网膜变薄,视乳头宽度增大,视乳头深度增大。结果证明,利用光学相干断层扫描仪进行活体视乳头建模和分析是可行的,力学分析可预测视乳头的形状变化,对进一步确定青光眼的病理进程有一定的指导意义。



中国组织工程研究
杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


全文链接:

关键词: 组织构建, 组织构建基础实验, 急性高眼压, 三维重建, 有限元分析, 视乳头, 视网膜, 国家自然科学基金

Abstract:

BACKGROUND: The measure and prediction of the shape of optic nerve head are the key issues for early diagnosis and duration prediction of glaucoma. Therefore, it is significant to research the shape variation of optic nerve head under high intraocular pressure.
OBJECTIVE: To establish three-dimensional finite element model of optic nerve head and to analyze the deformation of optic nerve head and the change in retina thickness after acute high intraocular pressure.
METHODS: Animal model of acute ocular hypertension was established by methods of anterior chamber perfusion. The tomographic images of the optic nerve head of a cat were obtained at the normal intraocular pressure and 5 320 Pa, 7 980 Pa, 10 640 Pa, 13 300 Pa, 15 960 Pa intraocular pressures using optical coherence tomography. Then, we measured the variation of retinal thickness at typical location. Basing on the tomographic images of optic nerve head of a cat at normal intraocular pressure, we obtained three-dimensional structure of retina and choroid using software MIMICS. Then three-dimensional model of optic nerve head was established by assembling the retina and choroid. The deformation of optic nerve head and the change in retinal thickness under high intraocular pressure were observed using software ABAQUS. The effectiveness of the model was verified by the experimental result.
RESULTS AND CONCLUSION: With the increase of intraocular pressure, the retinal thickness is thinner, the optic nerve head depth, width and the ratio of the depth to width are gradually increased. It suggests that the acute high intraocular pressure causes retinal thinning, optic nerve head widening and deepening. It is feasible to establish optic nerve head modeling in vivo by using optical coherence tomography, mechanical analysis can be applied to predict the shape variation of optic nerve head, which is significant to further deduce the pathological process of glaucoma.



中国组织工程研究
杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


全文链接:

Key words:  high intraocular pressure, glaucoma, imaging, three-dimensional, finite element analysis, retina

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