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A soft tissue deformation simulation method based on nonlinear anisotropic mass spring model

A mass-spring model, anisotropic technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of spring invariant characteristics, lack of theoretical basis, etc., to achieve the effect of improving accuracy

Pending Publication Date: 2019-03-19
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Therefore, there is no theoretical basis for setting the same parameters for all springs
Additionally, the invariant properties of springs during soft tissue deformation are problematic in extreme cases

Method used

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  • A soft tissue deformation simulation method based on nonlinear anisotropic mass spring model
  • A soft tissue deformation simulation method based on nonlinear anisotropic mass spring model
  • A soft tissue deformation simulation method based on nonlinear anisotropic mass spring model

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Embodiment Construction

[0068] The application will be described in further detail below.

[0069] The soft tissue deformation simulation method of the nonlinear anisotropic mass spring model of the present embodiment includes the following steps:

[0070] Step 1) construct the mass spring model, determine the initial elastic parameters of the mass spring model by the finite element method;

[0071] There are many different types of particle spring models, the most commonly used one is the Kelvin model, which is composed of elastic elements and damping elements, such as figure 1 shown. The evolution of the Kelvin model conforms to the control of the basic laws of dynamics, that is, the Lagrangian equation of motion, as shown in formula (1):

[0072]

[0073] where m is mass, X is displacement, F e is the force exerted on each particle, k d and k s are the damping coefficient and elastic coefficient, respectively. Since the damping coefficient is usually much smaller than the elastic coeffici...

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Abstract

The invention discloses a soft tissue deformation simulation method based on a roll nonlinear anisotropic mass spring model, which comprises the following steps: 1) constructing a mass spring model, and determining initial elastic parameters of that mass spring model by a finite element method; 2) setting spring parameters in the deformation process according to the stress and strain relationshipof the muscle tissue; 3) parameterize describing that anisotropic characteristic of the soft tissue by constructing a mechanical equation of the spring; 4) constructing that dynamic equation of the mass spring model and solving it. The invention has the beneficial effect that the setting of the spring parameter in the mass spring model is solved, the anisotropy is parameterized, and an improved Euler algorithm is adopted in solving the dynamic equation of the mass spring model.

Description

technical field [0001] The invention belongs to the technical field of soft tissue deformation model modeling, and in particular relates to a soft tissue deformation simulation method of a nonlinear anisotropic mass spring model. Background technique [0002] With the continuous development of science and technology, the virtual surgery simulation system can greatly reduce the difficulty of medical research and the cost of medical practice, so it has become a hot topic in recent years, and the virtual surgery simulation system has also achieved unprecedented development. Simulation of soft tissue deformation is an unresolved problem in virtual surgery simulation systems. On the one hand, real soft tissue in the medical field will exhibit complex biomechanical properties during deformation; on the other hand, soft tissue models need to be High computational efficiency and physical precision, which brings great difficulties to soft tissue modeling. [0003] Therefore, the sim...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 孙伟张逸成张小瑞
Owner NANJING UNIV OF INFORMATION SCI & TECH
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