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Non-linear particle spring soft tissue deformation simulation method

A technology of particle springs and simulation methods, applied in design optimization/simulation, instruments, electrical digital data processing, etc., can solve problems such as limiting the accuracy of physical materials in modeling, and achieve the effect of ensuring accuracy and computational complexity

Active Publication Date: 2020-08-04
TIANJIN UNIV
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Problems solved by technology

The assumption of using linear elasticity as the underlying model, while reducing computational effort at runtime, simultaneously limits the accuracy with which to model physical materials

Method used

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  • Non-linear particle spring soft tissue deformation simulation method
  • Non-linear particle spring soft tissue deformation simulation method
  • Non-linear particle spring soft tissue deformation simulation method

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] In the present invention, the Euler elasticity is used for the spring deformation in the sculpted point spring model to characterize the nonlinearity of the soft tissue, that is, the Euler elastic energy is used for the spring deformation in the sculpted point spring model, and then the calculated spring length can be obtained Satisfy the nonlinear stress-strain relationship, and then use it to characterize the nonlinear constitutive relationship of soft tissue.

[0023] Mathematician Euler (Euler) proposed the nonlinear constitutive relation of elastic energy and elastic line according to the principle of minimum potential energy when studying the steady-state problem of elast...

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Abstract

The invention discloses a non-linear particle spring soft tissue deformation simulation method, which comprises the following steps of: acquiring medical image data of soft tissues, segmenting an organ image, and obtaining three-dimensional surface grid data by utilizing Delaunay triangular patch grid subdivision; based on three-dimensional mesh generation, taking grid nodes as mass points, enabling the edge connected between the nodes to be a spring assembly formed by connecting a structural spring and a damping spring in parallel; forming a mass point spring soft tissue model; judging whether collision occurs between the surgical instrument and the mass point spring soft tissue model or not; if collision occurs, calculating stress of each mass point, updating the mass point position andthe mass point speed, and calculating the deformation value of the mass point on the surface of the mass point spring soft tissue model until no collision occurs between the surgical instrument and the mass point spring soft tissue model; and outputting a simulation result and performing visual rendering to finish the whole process. According to the invention, deformation of soft tissues can be simulated more accurately in real time.

Description

technical field [0001] The invention relates to the technical field of soft tissue deformation modeling, in particular to a nonlinear particle spring soft tissue deformation simulation method. Background technique [0002] In the fields of anatomy teaching, surgical simulation and surgical training, the physical motion simulation of organs and tissues is a core issue. Human tissues and organs generally have soft tissue characteristics, usually manifested in material properties such as inhomogeneity, anisotropy, quasi-incompressibility, nonlinearity, plasticity, and viscoelasticity. Accurate and real-time simulation of such soft tissue deformation processes has always been very important. Challenging research topics. The mass spring model is one of the most widely used models in human soft tissue modeling. Most of the existing interactive soft tissue deformation simulation models based on the mass spring model simplify the stress-strain constitutive relationship of soft tiss...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/14
CPCG06F30/20G06F2119/14
Inventor 段玉萍闫梦圆
Owner TIANJIN UNIV
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