流固耦合分析技术在胸主动脉血管瘤诊疗中的应用

目的:利用流固耦合分析技术对某特定病例开展胸主动脉血管瘤内血液流场、血管壁、血管瘤壁的变形和应力变化研究,为临床防治血管瘤提供决策支持.方法:在考虑血液与血管壁之间流固耦合作用的基础上,使用三维阈值分割及三维区域增长分割方法提取3D胸主动脉血管瘤表面模型,再利用工程软件CATIA进行光顺表面线型优化,得到血管瘤及其内部...

Application of fluid-solid coupling analysis in diagnosis of thoracic aortic hemangioma

Objective To explore the deformation and stress changes in the blood flow field,vessel wall and aneurysm wall within a thoracic aortic hemangioma using flow-solid coupling analysis for a specific case to provide decision support for clinical prevention and treatment of hemangioma.Methods A 3D surface model for thoracic aortic hemangioma was formed by 3D threshold segmentation and 3D region growing segmentation with considerations on the flow-solid coupling between the blood and the vessel wall.Then the engineering software CATIA was used to optimize the smooth surface lines to obtain a 3D model of the hemangioma and its internal blood.The blood flow characteristics of the thoracic aortic hemangioma and the deformation and stress of the hemangioma tissue were obtained through flow-solid coupling calculation method.Results The blood flow had a significant impact on the hemangioma and the vascular junction,and the overall hemangioma tissues presented a"respiratory"reciprocal displacement variation;the maximum von-Mises stress was 75.2 kPa which was about 11.6%of the hemangioma bearing capacity(650 kPa);the maximum shear stress was about 41.7 kPa.Conclusion Fluid-solid coupling analysis proves to be efficient for predicting the risk site of thoracic aortic hemangioma,which can provide data support for the clinical diagnosis and treatment.Chinese Medical Equipment Journal,2021,42(2):12-16,22]