Abstract
This paper presents a new method for rapidly generating accurate patient-specific lumbar spine volume mesh for finite element analysis. First, initial isosurface of the vertebral body is extracted from CT volume data. Then, a series of non-parallel best cross-section planes are placed semi-automatic ally according to the morphologic characteristic of surface model, forming a non-regular piecewise subspace. This and the embedded surface model are transformed to a subspace covered by a regular grid. Based on the information from the 2D of warped surface model, the structure grid contours are generated, from which a surface mesh of high quality is generated. At the same time, these grid nodes inside of the surface mesh are recorded as insertion points, and the tetrahedral volume mesh is created quickly by a boundary constrained Delaunay triangulation procedure in the subspace. Finally a two-step reverse transform procedure is employed to recover the shape feature of the lumbar volume mesh in the original three-dimensional space, achieving a smooth change of element size transition.
Published Version
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