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CT grayscale-material property assignment finite element modeling method for osteotomy orthopedics

A technology of material properties and modeling methods, applied in special data processing applications, instruments, design optimization/simulation, etc., can solve problems such as the inability to realize model space position transformation, and achieve the effect of accurate finite element calculation results and simple operation

Active Publication Date: 2019-03-12
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the traditional bone finite element modeling method based on CT image grayscale-material attribute assignment cannot realize the spatial position transformation of the model, and the bone model established by the finite element method can meet the requirements based on CT image grayscale. The non-uniform assignment of material properties can also allow the bone model to change its spatial position relative to the original CT image range. The method has the characteristics of highly restored model materials, simple operation, and accurate finite element calculation results.

Method used

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  • CT grayscale-material property assignment finite element modeling method for osteotomy orthopedics
  • CT grayscale-material property assignment finite element modeling method for osteotomy orthopedics
  • CT grayscale-material property assignment finite element modeling method for osteotomy orthopedics

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Embodiment 1

[0037] A CT grayscale-material property assignment finite element modeling method for osteotomy orthopedics is carried out through the following steps:

[0038] A CT grayscale-material attribute assignment finite element modeling method for osteotomy orthopedics, comprising the following steps:

[0039] (1) Skeletal 3D model reconstruction

[0040] Collect the computed tomography data of the bone of the target object, and import the obtained tomography data in Dicom format into medical 3D reconstruction software to establish a 3D bone model;

[0041] (2) Surface construction and solidification of bone surface model

[0042] For the constructed 3D bone model, in the reverse reconstruction software, the surface smoothing and de-feature processing of the 3D bone model are further carried out, and a surface patch is constructed on the surface of the 3D bone model, and then a grid is constructed on the basis of the surface piece, so that through fitting The surface gets the skeleta...

Embodiment 2

[0060] A specific embodiment of tibial rotation osteotomy orthopedics is used to describe a CT grayscale-material property assignment finite element modeling method for osteotomy orthopedics of the present invention. The method of the present invention is carried out through the following steps:

[0061] (1) Skeletal 3D model reconstruction

[0062] The computed tomography data of a patient clinically diagnosed with tibial rotational deformity were collected. According to the obtained tomographic imaging Dicom format data, the three-dimensional model of the tibia was further imported into the medical three-dimensional reconstruction software. The tibial model was externally rotated by three-dimensional space measurement. 41.8°, such as figure 1 shown.

[0063] (2) Surface construction and solidification of bone surface model

[0064] For the constructed 3D model of the tibia, the surface of the model was further smoothed and de-characterized in the reverse reconstruction sof...

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Abstract

The present invention discloses a CT gray-material property assignment finite element modeling method used for osteotomy. The method comprises: (1) skeleton three-dimensional model reconstruction; (2) hook surface construction and substantialization of a skeleton surface model; (3) skeleton segmentation of a bone entity model; (4) meshing and output of a skeleton member entity model that the position of which is not changed; (5) position adjustment of a skeleton member entity model that the position of which is changed and establishment of a reference model; (6) CT image gray-material property experience formula based mesh model assignment; and (7) position adjustment of a skeleton member mesh model and processing before finite element modeling, and obtaining a final skeleton finite element model. The method disclosed by the present invention can realize random adjustment of the position of the skeleton member model, has gray assignment based non-uniform element material properties, and has characteristics of high reducibility of a model material, simple operations, an accurate finite element calculation result, and the like.

Description

technical field [0001] The invention relates to the technical field of finite element analysis of bone biomechanics, in particular to a finite element modeling method for CT gray value assignment of bone spatial position or morphological changes. Background technique [0002] Accurate material parameter assignment is a key factor to ensure the calculation accuracy of the finite element model. At present, the material parameter assignment of the bone model is mainly divided into two categories, one is the uniform assignment method, and the other is the non-uniform assignment based on the spatial registration of the CT image grayscale of the bone model. The method of uniform assignment is to treat bone tissue as a uniform material property, and roughly assign a uniform elastic modulus parameter to cortical bone with a higher elastic modulus and cancellous bone with a lower elastic modulus. The operation is simple and fast, and the computer computing resources occupied during ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 欧阳汉斌黄文华谢普生钱堃杨洋黄华军
Owner SOUTHERN MEDICAL UNIVERSITY