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Three-dimensional space distribution of thermal conductivity in bone tissue: A thermodynamics finite element analysis
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- Author:
- No author available
- Issue:
- 39
- DOI:
- 10.3321/j.issn:1673-8225.2008.39.023
- Key Word:
- 射频消融术;骨皮质;骨松质;有限元法;热传导;热分布;热力学;导热性
Abstract： 参考生物力学有限元模型方法建立牛胫骨近端三维热力学有限元模型.选取新鲜牛胫骨上段15 cm,以层厚2 mm CT扫描胫骨近端,运用同济大学牛物医学工程研究所实验室编写的数字图像处理程序处理CT图像,点云采集文件输入逆向工程软件Geomagic进行实体模型构建.将生成的实体模型IGES文件导入到有限元分析软件Ansys 9.0中去,构建热力学有限元模型,进行二维热力学有限元模型的传热计算.模型骨结构表面温度设定37℃,骨内指定部位假设有15 mm直径球形区域热源,温度为90℃,在该条什下执行稳态计算.结果显示距离热源不同距离的横截山j温度分布等值线密度不同,越接近电极,等值线越密集,且旱不规则椭圆形.在模型矢状面上,距离热源越近,温度分布等值线越密集,越远越稀疏,亦呈不规则椭圆形分布.提示牛胫骨组织消融范围的大小与电极针暴露长度和空间布针位置密切相关.在骨组织中,整个热力场围绕消融电极呈不规则椭圆球形分布.
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