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Soft tissue deformation simulation method

A simulation method and soft tissue technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low precision, prolonged deformation process, and poor real-time performance

Inactive Publication Date: 2013-11-20
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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AI Technical Summary

Problems solved by technology

The explicit Euler method has a small amount of calculation, but generally it only converges to the first order, and the accuracy is not high. Suitable for mass-spring models
The implicit Euler method has high precision and good stability, but the amount of calculation is relatively large
The Runge-Kutta method also has high precision and stability, but it needs to calculate the value of the quartic function in one step calculation, which has a large amount of calculation and poor real-time performance

Method used

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Embodiment Construction

[0034] like figure 1 and figure 2 As shown, a soft tissue deformation simulation method includes the following steps:

[0035] Step 1): collect the data information of soft tissue, and establish a biomechanical model of soft tissue by adopting a tetrahedron-based mass point-spring body model. The biomechanical model is composed of n mass points, and for any mass point i among them, the following dynamics are satisfied Learning equation:

[0036] m i ∂ 2 x i ∂ t 2 + F in i = F ext i

[0037] The invention adopts the Kelvin viscoelastic model to reflect the mechanical properties of the soft tissue, that is, the mass points are c...

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Abstract

The method relates to a soft tissue deformation simulation method. The soft tissue deformation simulation method includes the following steps: a biomechanics model of soft tissue is built, and mass points in the biomechanics model are initialized; force feedback equipment exerts action force on the soft tissue to carry out collision detection; motion state information is calculated in an improved Euler algorithm; the state of each time step of the model is output to a display screen, and the deformation process of the soft tissue is displayed in a dynamic mode; feedback force is calculated, and touch feedback is output. By means of the steps, real-time performance, precision and smoothness of the feedback force in virtual operation simulation can be effectively achieved, precision and real-time performance of soft tissue deformation simulation are improved, and accordingly requirements of virtual operation simulation are met.

Description

technical field [0001] The invention relates to a soft tissue deformation simulation method. Background technique [0002] Virtual surgery simulation is one of the important applications of virtual reality technology. Its goal is to use various medical imaging data and virtual reality technology to establish a realistic virtual surgical environment in the computer, so that doctors or trainees can use this virtual environment for surgical training. [0003] In virtual surgery simulation, the deformation model of soft tissue organs determines the visual effect and force feedback accuracy of virtual surgery simulation. Common soft tissue deformation calculation models are divided into two categories: geometry-based deformation models and physics-based deformation models. The geometry-based deformation model only considers the change of geometric shape, but ignores the actual mechanical constitutive equation of soft tissue and the effect of object mass, force or other physical ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 刘雪梅王瑞艺孙新娟姚建斌宋连公冯飞郭松高阳李海瑞朱韶楠
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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