基于有限元法的生物体三维温度场无损重构

The Non-invasive 3-D Temperature Field Reconstruction of Organism by Finite Element Method

医学热诊断技术是一种无创的新型功能影像技术,其独特的诊断机理使其成为一种有潜力的医学影像辅助诊断手段。但是目前的热诊断大多根据热像图进行表观上的判断,主要依靠定性分析。本研究基于有限元法,通过求解Pennes生物传热方程,只需提取生物体的表面温度来重构三维生物体温度分布。利用通用有限元软件ANSYS的APDL二次开发功能和图形显示功能,得到直观的三维温度图像,特别是通过优化算法提取出体内的单个或多个异常热源信息,包括位置和强度,从而为医生的热诊断提供定量的分析。

As a new non - invasive functional imaging technology, thermal diagnosis has become a potential assistant method for its special diagnosis theory. The current diagnosis is almost restricted in subjective experience according to thermal image, with a empirical quantitative analysis. In this paper, 3 - D temperature field can be reconstructed through solving Pennes bio- heat transfer inverse equation relating to the date of surface temperature, by taking advantage of the FEM （finite element method, FEM）. With the help of the large FEM analysis software ANSYS, especially its APDL （ANSYS parametric design language, APDL）secondary development function and graphical display function, intuitionistic 3 - D temperature distribution of organism can be obtaned. It should be emphasized that an optimal algorithm is brought forward to calculate one or more inner abnormal heat sources information including the location and intensity, to provide quantitative analysis for doctors.