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Method for constructing vertebral three-dimensional geometry and finite element mixture model

A technology of 3D geometry and hybrid model, which is applied in the construction of spine model and the field of construction of 3D geometry and finite element hybrid model, which can solve the problems that cannot be scientifically measured, cannot analyze the force of the spine, and lack direct interaction between spinal soft tissue and bone. issues such as power, to reduce complexity and facilitate program processing and analysis

Inactive Publication Date: 2011-10-05
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The three-dimensional geometric shape model of the spine established by the ASM and ICP methods can only analyze the geometric shape of the spine in practical applications, and lacks the direct interaction force between the soft tissue and bones of the spine, so it cannot analyze the stress on the spine. The various parts and key points of the spine cannot be scientifically measured

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  • Method for constructing vertebral three-dimensional geometry and finite element mixture model
  • Method for constructing vertebral three-dimensional geometry and finite element mixture model
  • Method for constructing vertebral three-dimensional geometry and finite element mixture model

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Embodiment 1

[0096] The present invention is a method for constructing a three-dimensional geometric and finite element hybrid model of the spine, see figure 1 , the construction method of the 3D geometry and finite element hybrid model of the spine includes the following process:

[0097] Process 1, perform 3D reconstruction on CT images of the human spine to obtain a 3D model of the spine, cut the 3D model and retain a single 3D model of the lumbar spine; establish a collection of 3D spine images by processing a large number of human spine images ; Lay the foundation for the establishment of the spine three-dimensional geometric shape statistical model and finite element analysis.

[0098] Process 2. Define and manually calibrate the feature points of the 3D spine image, and save the calibrated shape matrix of each spine sample to form a shape matrix sample set; from this step, establish a 3D geometric statistical model of the spine;

[0099] In practice, it is difficult to have a unifi...

Embodiment 2

[0155] The construction method of the 3D geometry and finite element hybrid model of the spine is the same as in Example 1, wherein in process 1, the 3D model of the spine is cut and the 3D model of a single lumbar spine is retained, figure 2 (a) shows the three adjacent vertebrae of the spine after reconstruction and before division. It can be seen that the vertebrae of the spine have different shapes and are closely connected with the ribs. Even the two adjacent vertebrae are very different. It will cause a lot of trouble in the feature point labeling and model matching. Therefore, in the process of processing, each vertebra of the spine image needs to be segmented and modeled separately, so as to improve the accuracy of the spine model. figure 2 (b) shows the first bone of the 3D lumbar spine obtained after 3D cutting. By processing a large number of human spine images, a collection of three-dimensional spine images is established.

[0156] Process 2 is to define and ca...

Embodiment 3

[0168] The construction method of the three-dimensional geometry and finite element hybrid model of the spine is the same as that in Embodiment 1-2, wherein process 5 obtains the three-dimensional geometric form statistical model as follows:

[0169] X ≈ X ‾ + Ψ * b

[0170] Ψ=(Φ 1 , Φ 2 ,...,Φ t )

[0171] b=(λ 1 ,λ 2 ,...,λ t ) T

[0172] ψ can represent the main variation pattern in this sample set. Evaluation of the accuracy of the model can be measured by how well ψ explains the overall variation pattern of the sample set. The higher the degree of interpretation, the more accurate the model can represent the shape change of the entire sample.

[0173] Let λ T for all eigenvalues ​​λ k Sum, then use λ k / λ T Represents the contribution rate of a mode to the overall change mode, and the contribution rate of ψ to the overall change mode can be calculated by the sum of...

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Abstract

The invention provides a method for constructing a vertebral three-dimensional geometry and finite element mixture model, which belongs to the technical field of processing of medical images. The method comprises the following construction processes of: inputting a vertebral computer tomography (CT) image; performing three-dimensional reconstruction and three-dimensional cutting on the CT image to acquire a vertebral three-dimensional image set; establishing a three-dimensional geometric statistical model, namely defining and manually calibrating vertebral characteristic points, aligning and registering vertebral images, and training a sample set to acquire the statistical model; and generating a finite element model, importing the statistical model, generating a surface mesh model, and generating a volume mesh model, wherein the model can be directly imported into finite element analysis software for biomechanics analysis. By the method, a vertebral geometrical shape can be precisely described, the accuracy of finite element analysis results can be ensured, and the precision of vertebral models can be improved. The method is convenient to use, facilitates the scientific measurement of the shapes and the stress of vertebras and can be used for researches related to vertebral columns and the vertebras in the field of surgical medicine.

Description

technical field [0001] The invention belongs to the technical field of medical image processing, and mainly relates to a method for constructing a spine model, in particular to a method for constructing a three-dimensional geometric and finite element mixed model of the spine, which can be used in research related to the spine and the spine in the field of surgical medicine. Background technique [0002] At present, spine-related diseases have become common and highly morbid in my country. Although spine surgery has been greatly developed in recent years, due to the characteristics of spine surgery itself and the complex structure of the spine, the operation is very difficult and dangerous. [0003] With the expansion of the application of computer graphics and image technology in various fields of medicine and the continuous upgrading of medical imaging equipment, spatial three-dimensional positioning system, computer medical image processing and three-dimensional visualizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00
Inventor 鱼滨代俊王莹
Owner XIDIAN UNIV
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