Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Soft Tissue Modeling Method Based on Position Constraints and Nonlinear Springs

A modeling method, soft tissue technology, applied in 3D modeling, instrumentation, complex mathematical operations, etc., can solve the problems of nonlinear volume retention, error, modeling method difficulty, etc., and achieve the effect of compensating for instability

Active Publication Date: 2022-07-12
NANCHANG UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the traditional MSM still has defects (a supporting ball spring model for soft tissue deformation simulation, Computer Application and Software, 2013 (01): 109-112): 1. The accuracy of the model is closely related to the spring coefficient, and the coefficient The size is usually determined only by experience; 2. The mechanical principle of traditional MSM is based on Hooke's law, so it cannot accurately simulate the biological characteristics of biological soft tissues, such as nonlinearity, volume retention, etc.
3. The calculation results of differential equations bring inevitable errors, which affect the accuracy and stability of the model
However, none of their solutions completely solve the defects of the above-mentioned traditional models
[0008] To sum up, due to the complexity of human soft tissue structure, the modeling method of soft tissue model has always been a key and difficult part of the virtual surgery system, and currently there are few soft tissue modeling methods that can meet the realistic needs of virtual surgery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Soft Tissue Modeling Method Based on Position Constraints and Nonlinear Springs
  • A Soft Tissue Modeling Method Based on Position Constraints and Nonlinear Springs
  • A Soft Tissue Modeling Method Based on Position Constraints and Nonlinear Springs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] The present invention will be further described below with reference to the accompanying drawings.

[0060] Soft tissue modeling methods based on position constraints and nonlinear springs, such as figure 1 As shown in the flowchart, the method steps include:

[0061] S1. Use three-dimensional modeling technology to build a soft tissue model for the collected medical image information, the model is as follows figure 2 and as image 3 shown consists of tetrahedral elements formed by nonlinear springs and virtual volume springs;

[0062] S2. Simulate the deformation behavior of the soft tissue model. During the deformation process of the model, the nonlinear spring makes the stress and strain of the model show a linear and nonlinear relationship. The virtual body spring can suppress the change of the model volume, and they will work together to simulate the biological behavior of the soft tissue. mechanical properties;

[0063] S3. Estimate the approximate position o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a soft tissue modeling method based on position constraints and nonlinear springs. (3) Estimate the approximate position of each node, and then judge whether the state of the node constraint equation changes, including the spring length and curvature constraints; if the initial state of the equation changes, the node will be corrected to the correct position within a reasonable range ; If the initial state of the equation does not change, the nonlinear spring and virtual body spring will simulate the deformation effect of the soft tissue; (4) The single-step iteration of calculating the deformation ends, and the next cycle is entered. The present invention adopts a nonlinear spring system and a virtual body spring to simulate the biomechanical properties of soft tissues, and also adopts a new constraint equation to limit the node displacement to enhance the stability of the model, and improves the traditional mass spring model with poor accuracy and instability. defect.

Description

technical field [0001] The invention belongs to the technical field of soft tissue deformation model modeling, in particular to a soft tissue modeling method based on position constraints and nonlinear springs, which is used to solve the soft tissue modeling problem in virtual surgery experiments. Background technique [0002] Virtual surgery is an important surgical assistant training system that can realistically simulate the surgical environment in a low-cost mode. Virtual surgery can not only provide users with visualization needs, but also make doctors familiar with the use of surgical instruments and accumulate surgical skills. At present, a perfect virtual surgery system should have three requirements at the same time: real-time, accuracy and stability. Soft tissue modeling is one of the core modules in virtual surgery, and the fineness of the model plays a decisive role in the reliability of the system. [0003] Soft tissue modeling methods mainly include geometric...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/00G06F30/20G06F17/13G06F119/14
CPCG06T17/00G06F17/13G06F30/20G06F2119/14Y02T90/00
Inventor 李春泉潘雨晨彭佳琦
Owner NANCHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com