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Soft tissue deformation simulation method

A simulation method and soft tissue technology, applied in image data processing, special data processing applications, 3D modeling, etc.

Inactive Publication Date: 2011-05-04
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0007] The purpose of the present invention is to solve the real-time, fidelity and large deformation simulation problems of soft tissue deformation simulation in the virtual surgery system, overcome the deficiencies of the prior art, and use the viscoelastic model that can truly reflect the mechanical properties of soft tissue as the mechanical model to provide A soft tissue deformation simulation method based on the meshless method, and realize the most critical basic part to meet the needs of the virtual surgery system

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Embodiment Construction

[0047] The overall processing flow of the present invention is as figure 1 As shown, the key steps are to construct the governing equations based on viscoelastic mechanics and use the smooth particle hydrodynamics method to realize the calculation of the motion state of the meshless particle model. The following describes the implementation of each step in detail in accordance with the order of the overall flowchart.

[0048] 1. Construct the governing equations for soft tissue deformation simulation

[0049] Almost all biosolids are viscoelastic. This invention overcomes the defect of using a simple elastic model to reflect the mechanical properties of soft tissues in order to pursue real-time performance in the traditional technology, and strives to improve the accuracy of deformation simulation while taking into account real-time The linear viscoelastic equation is used to reflect the mechanical properties of soft tissue.

[0050] use figure 2 The Kelvin viscoelastic mo...

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Abstract

The invention relates to a soft tissue deformation simulation method based on smooth particle hydrodynamics, belonging to the technical field of graphic processing. In the method, a smooth particle hydrodynamics method is selected, and a viscoelastic mechanics model is used for reflecting the biomechanical characteristics of soft tissue. The method comprises the following steps of: constructing a series of equations related to soft tissue deformation simulation according to the viscoelastic model; selecting a proper support domain search strategy and a smooth kernel function, approximately calculating each related item of the equation by adopting the particle approximation method, and calculating the variation values of the density, the position, the velocity and the like of each particle along with time through the display integration method; and dynamically outputting the status of each time step size of the particle model to a screen, rendering texture irradiation, and displaying the real-time deformation process of soft tissues and organs under stressing conditions. The method does not need troublesome grid computing, thereby increasing the accuracy and the real-time performance of soft tissue deformation simulation.

Description

technical field [0001] The invention relates to the technical field of virtual surgery, in particular to a soft tissue deformation simulation method based on smooth particle hydrodynamics, which belongs to the technical field of real-time simulation of object deformation in the technical field of graphics processing, and its IPC patent classification number is G06T17 / 00. Background technique [0002] Virtual surgery is the application of virtual reality technology in modern medicine, and it is a multidisciplinary research field. It is mainly composed of two parts: medical data visualization and modeling, and force deformation simulation of human soft tissues and organs. It provides users with a true reproduction of the surgical scene visually and tactilely. It can be used in the training of surgeons, the prediction of surgical results, the auxiliary formulation of surgical plans, surgical navigation, etc., and has great theoretical significance and broad application prospect...

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Application Information

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IPC IPC(8): G06T17/00G06F19/00
Inventor 刘雪梅皇甫中民向明森闫雒恒赵振国赵晶闫新庆吴慧欣郝爱民刘明堂孙新娟杨礼波石秋华刘欢
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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