Soft tissue stress deformable model modeling method based on mesh-free radial base data fitting

A technology of meshless method and modeling method, which is applied in the fields of electrical digital data processing, special data processing applications, medical simulation, etc., can solve problems such as poor real-time computing performance and complex structure, and achieve real-time accurate interaction and simplified computing Process, Calculation Convenience Effect

Active Publication Date: 2017-04-19
NANCHANG UNIV
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Problems solved by technology

In view of the shortcomings of the existing physical deformation model of biological soft tissue, such as complex structure and poor real-time calculation performance, considering the anisotropic characteristics of biological soft tissue, taking force as the data flow, and obtaining the force point of the soft tissue offline through the radial basis meshless method as the center, Force-displacement data of a limited number of equally spaced points on the surface, using the McQuarter method to construct a mixed force-displacement surface deformation model of soft tissue surface nodes

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  • Soft tissue stress deformable model modeling method based on mesh-free radial base data fitting
  • Soft tissue stress deformable model modeling method based on mesh-free radial base data fitting
  • Soft tissue stress deformable model modeling method based on mesh-free radial base data fitting

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Embodiment Construction

[0027] The invention will be further illustrated by the following examples.

[0028] The surface deformation of biological soft tissue under the action of space force F has the following surface system:

[0029]

[0030] Among them, v o is the reference coordinates of each node on the surface when the soft tissue is not stressed, Δv x , Δv y , Δv z Respectively, the component F of the space force F along the space Cartesian coordinate system x , F y , F z The surface deformation component of the soft tissue under the action, is a random error term.

[0031] Step 1 is to establish m odd-numbered node matrices with equal intervals d on the soft tissue surface around the force point O. Take the reference coordinates of the soft tissue surface; in the actual operation, the tissue diameter range of the force deformation of the biological tissue is about 1 to 4cm, and the soft tissue with a size of 48mm×48mm is selected for discrete points, and 121 equally spaced nodes a...

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Abstract

Disclosed is a soft tissue stress deformable model modeling method based on mesh-free radial base data fitting. For overcoming the shortcomings of complex structure, poor real-time performance and the like of the existing biological soft tissue physical deformable model, a soft tissue surface nodal force-displacement hook face deformable model is established by the steps of considering isotropic characteristics of the biological soft tissues, taking force as data flow, obtaining stress displacement data through a radial basis mesh-free method in an off-line manner, wherein the stress displacement data takes soft tissue stress points as the center, and a finite number of equal-interval points are on the surface; and finally establishing the deformable model by using a Marquardt method. The model, by combination with the characteristics of a geometric deformable model and a physical deformable model, greatly simplifies a calculation process while the physical characteristic truth property of the deformable model is maintained; in addition, the high real-time property of interaction is ensured; and accurate real-time interaction between the biological soft tissue deformable model and an operator in a virtual operation is realized.

Description

technical field [0001] The invention relates to modeling of a force-deformation model of a soft tissue in a virtual operation, which is used to realize accurate real-time interaction between a biological soft tissue model and an operator in a virtual operation. Background technique [0002] When virtual surgery is performed, the ideal biological soft tissue model can accurately and instantly feed back its deformation to the operator during real-time interaction, which requires that the biological soft tissue model must have high-precision real-time deformation characteristics. [0003] Soft tissue deformation models can be divided into geometric deformation models and physical deformation models according to whether the soft tissue deformation process is based on physical principles. The earliest geometric deformation model is the FFD (Free Form Deformation) model proposed by Sederberg, which simulates the deformation of objects completely from a geometric point of view. In...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16H50/50
Inventor 李春泉罗族刘小平周建勇洪智超陈利民熊鹏文林凡超洪瑶
Owner NANCHANG UNIV
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