Real-time interaction mesh-free soft tissue deformation simulation method

A simulation method and real-time interactive technology, applied in CAD numerical modeling, special data processing applications, instruments, etc., can solve the problems of insufficient authenticity and real-time performance, so as to improve simulation realism, improve simulation real-time performance, Good real-time and authentic effects

Inactive Publication Date: 2018-10-26
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to focus on solving the problems of weak real-time performance and insufficient authenticity in soft tissue deformation simulation, and propose a real-time interactive meshless soft tissue deformation simulation method

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  • Real-time interaction mesh-free soft tissue deformation simulation method
  • Real-time interaction mesh-free soft tissue deformation simulation method
  • Real-time interaction mesh-free soft tissue deformation simulation method

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] like figure 1 As shown, the present invention comprises the following steps:

[0031] (1) Import the CT image of the soft tissue into the software Mimics and export the STL file of the 3D model, and use the MeshLab software to convert the STL file into an OBJ file to obtain vertex information.

[0032] (2) Due to the fast convergence speed of moving least squares (MLS), MLS is used to construct meshless shape functions, as follows:

[0033] Φ T (x)=(Φ 1 (x),Φ 2 (x),......Φ n (x))=P T (x)A -1 (x)B(x) (1)

[0034] where Φ T (x) denotes the meshless shape function constructed by MLS, Φ i (x)(i=1,2,...,n) represents the point x i The shape function of , P T (x) is the transpose of the polynomial basis function matrix P(x), A -1 (x) is the inverse form of the first weighted instantaneous matrix A(x), and B(x) is the second weighted instantaneous matrix, ...

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Abstract

The invention discloses a real-time interaction mesh-free soft tissue deformation simulation method, which comprises the following steps that: (1) transforming the CT (Computed Tomography) image of asoft tissue into an OBJ file to conveniently obtain vertex information; (2) using MLS (Moving Least Squares) to construct a mesh-free function; (3) bringing Kelvin viscoelasticity into a tissue model;(4) according to the displacement of all nodes corresponding to given stress calculated in S(3), using a Marquardt algorithm to pre-fit a mathematical relationship between force on the soft tissue and the displacement of each node; and (5) importing an enrichment function to simulate tissue surface discontinuity cracks caused by operations including segmentation. By use of the method, the Kelvinviscoelasticity model is brought into the human body tissue model, the viscoelasticity of the soft tissue can be more favorably presented, simulation validity is improved, the Marquardt algorithm is used for pre-fitting the mathematical relationship between force on the soft tissue and the displacement of each node, simulation instantaneity is improved, and meanwhile, weight function enrichment isimported to realize the interactive simulation of soft tissues.

Description

technical field [0001] The invention relates to a soft tissue deformation simulation method, in particular to a real-time interactive meshless soft tissue deformation simulation method. Background technique [0002] Apprenticeship is an important way for Chinese children to learn skills from ancient times to the present, and medical study is no exception. Novices can improve their medical skills by learning from experienced medical practitioners. Although the traditional apprenticeship has laid the foundation for the development of medical education, this training method has a long cycle and a high cost. With the development of computer science and technology, computer-based virtual surgery simulation gradually solves the above defects. [0003] Human soft tissue modeling is one of the important research areas in virtual surgery simulation. Human soft tissue can accurately obtain the deformation under external force through the model, which helps to realize the real-time in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10G06F2119/06
Inventor 张小瑞俞雪峰孙伟宋爱国
Owner NANJING UNIV OF INFORMATION SCI & TECH
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