Technique of automatic abdominal aortic aneurysm segmentation and 2D-mesh generation
- VernacularTitle:腹主动脉瘤的自动化分割及其二维网格剖分技术
- Author:
Kun-hu LU
1
;
Zhi-yong LI
1
Author Information
1. Biomechanics Laboratory, School of Biological Science and Medical Engineering, Southeast University
- Publication Type:Journal Article
- Keywords:
Abdominal aortic aneurysm(AAA);
Image segmentation;
Mesh generation;
Finite element analysis(FEA);
Stress distribution
- From:
Journal of Medical Biomechanics
2013;28(5):E515-E522
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop an automatic segmentation and mesh generation technique for abdominal aortic aneurysm (AAA) and to build a 2D numerical analysis model that can be used for finite element analysis (FEA). Methods A method that totally based on morphology processing was developed to segment all the components of the AAA. For each closed curve that obtained, its signed distance function was then calculated. According to the set relationships between each curve, the final signed distance function was calculated. Under the control of this function and an equilibrium relationship, iterated Delaunay algorithms were used until the equilibrium relationship was satisfied or the set conditions were reached. Then the program ended and the finite element model was generated. Results Automatic segmentation of the lumen as well as semiautomatic segmentation of the wall and calcification were achieved. Different parts of the AAA were meshed, and the type and density of the mesh could be controlled. Two finite element models were established for stress analysis: one was the coupling mesh of the thrombus and the wall, and the other was the coupling mesh of the thrombus, the wall and the calcifications. Conclusions An automatic segmentation and mesh generation algorithm with high accuracy has been developed, without any complicated computation or initial curve. The mesh generation algorithm tends to produce high quality meshes and the generation is easy to be controlled by only two parameters. The generated mesh has been verified to be useful in FEA simulation.
