Simulation method for soft tissue pressing and deformation recovery

A simulation method and deformation recovery technology, applied in medical simulation, medical informatics, informatics, etc., can solve problems such as the inability to describe the volume characteristics of soft tissue, and achieve the effect of improving deformation accuracy, deformation recovery ability, and authenticity.

Active Publication Date: 2019-09-27
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0004] Purpose of the invention: In view of the above problems, the present invention proposes a soft tissue simulation method for virtual surgery system, which simulates the deformation of soft tissue under the action of external force and after the external force is removed This method can not only meet the real-time requirements of simulation,...

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  • Simulation method for soft tissue pressing and deformation recovery
  • Simulation method for soft tissue pressing and deformation recovery
  • Simulation method for soft tissue pressing and deformation recovery

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Embodiment Construction

[0031] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] The simulation method of soft tissue compression and deformation recovery described in the present invention, the process is as follows figure 1 As shown, it includes four parts: the construction of a particle spring surface model with curved spring elements added to the soft tissue surface, the optimization of model parameters using particle swarm optimization, and the internal modeling of soft tissue based on the internal particle domain constraints of constrained springs. The specific implementation steps are as follows:

[0033] (1) According to the medical image data, the soft tissue surface model is constructed by using the particle spring model based on the triangular topology, and the bending spring element is added to improve the simulation accuracy of the soft tissue deformation recovery. Using OpenGL to reco...

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Abstract

The invention discloses a simulation method for soft tissue pressing and deformation recovery. The method is used for simulating a pressing troubleshooting process of a liver in a virtual operation. The method comprises the following steps: constructing a surface model of a liver surface by using a mass point spring model with a bending spring, optimizing model parameters by using a particle swarm algorithm, then constructing a liver internal construct model by using internal mass point domain constraints based on stratification, and connecting stratification mass point domains by using constraint spring elements. According to the method, the deformation recovery capability and calculation efficiency of the mass point spring model during large deformation are improved, the deformation accuracy and authenticity of the mass point spring model are enhanced, the difficulty that a traditional mass point spring model cannot simulate the internal volume force is solved, and the viscoelastic characteristic of the soft tissue deformation process is simulated.

Description

technical field [0001] The invention relates to a soft tissue force-tactile simulation method, in particular to a simulation method for simulating soft tissue pressing and deformation recovery. Background technique [0002] In the process of performing surgery on human soft tissues, such as the liver, it is first necessary to sense the pressure of the liver to determine the lesion area. In the prior art, it is mentioned that the virtual surgery training system is used to provide surgeons with the conditions and platform for surgical training and learning. An important technical difficulty in realizing the virtual surgery system is the high-precision simulation of the virtual liver or other soft tissues. [0003] In the existing virtual soft tissue simulation method, the finite element model divides the problem solving domain into several non-overlapping units, and establishes the stiffness matrix through the unit shape function and node interpolation function to construct an...

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Application Information

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IPC IPC(8): G16H50/50
CPCG16H50/50
Inventor 张小瑞吴海伦孙伟刘佳宋爱国牛建伟
Owner NANJING UNIV OF INFORMATION SCI & TECH
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