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Mesh models with internal discrete elements

A grid model and component technology, applied in 3D modeling, image data processing, instruments, etc., can solve problems such as the change of the local size of the triangular mesh on the surface, deformation of three-dimensional components, etc.

Inactive Publication Date: 2007-02-07
KONINK PHILIPS ELECTRONICS NV
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Problems solved by technology

However, this method is very limited because it does not account for variations in the local dimensions of the surface triangle mesh, which can lead to deformed volumetric elements

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  • Mesh models with internal discrete elements
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  • Mesh models with internal discrete elements

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[0026] The present invention relates to a first embodiment of an image processing system for automatically segmenting objects of interest represented in a three-dimensional image using a three-dimensional discrete deformable volumetric mesh model. The surface S of the segmented solid mesh model is adapted to the surface of the three-dimensional object, and the solid mesh V of the model is adapted to the mesh of the surface S. According to the invention, a tetrahedral mesh, ie a solid mesh composed of tetrahedra, is generated from a surface mesh composed of triangles. Triangular meshes describe the surface of a 3D object of interest, while tetrahedral meshes describe volumes within the same 3D object. Both types of meshes have the same surface triangles. The ideal element shape is a regular tetrahedron with equilateral surfaces and equal side lengths.

[0027] The present invention also utilizes a two-dimensional discrete deformable mesh model and relates to a second embodime...

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Abstract

An image processing system having image data processing means of segmentation of an object of interest using an unstructured deformable mesh model composed of surface (TJ) and internal (THJ) discrete elements, and further means of refining said mesh model by automatically dynamically adapting the size of the internal discrete elements to the local variation of size of the surface discrete elements. This system has means for acquiring size information (LJ) related to the surface discrete elements in order to evaluate the optimal size to be assigned to the internal discrete elements and for propagating this size information from the surface discrete elements to the internal discrete elements while new internal discrete (THJ) elements are created during the refinement process by insertion of new vertices inside said internal discrete elements.

Description

technical field [0001] The invention relates to an image processing system with image data processing means for segmenting an object of interest in a two-dimensional or three-dimensional image, the image processing system comprising an operation of mapping a deformed mesh model onto the object of interest. The invention also relates to a medical examination device for generating two-dimensional or three-dimensional medical images processed by a processing system for the segmentation of objects, such as body organs or body fluid flows, for the study or detection of deformities or pathologies. The invention is suitable for particular applications in the field of medical imaging methods, program products and devices or systems. Background technique [0002] In three dimensions, tetrahedral meshes, ie solid meshes composed of tetrahedra, are mainly used to model physical quantities in three-dimensional objects, such as the flow of blood in a vascular system. The matching of mes...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20
CPCG06T17/20G06T17/205
Inventor F·拉法盖M·弗兰德金J·-M·鲁埃
Owner KONINK PHILIPS ELECTRONICS NV