Int J Comput Assist Radiol Surg - Reality based modeling and simulation of gallbladder shape deformation using variational methods.

Tópicos

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Resumo

RPOSE: Accurate soft tissue deformation modeling is important for realistic surgical simulation. The aim of this study is to develop a reality-based gallbladder model and to determine material constants that represent gallbladder wall mechanical properties.METHODS: Mechanical experiments on porcine gallbladder were performed to investigate tissue deformation, and an exponential strain energy function was used to describe the nonlinear stress-strain behavior of the gallbladder wall. A new volumetric function based upon the exponential strain energy function was proposed to model the gallbladder organ. A genetic algorithm was used to identify the material parameters of the proposed biomechanical model from the experimental data.RESULTS: The material constants of the exponential strain energy model were determined based on the experimental data. Deformation simulation and haptic rendering using the proposed gallbladder model were presented. Comparison between deformation predicted by the proposed model and that of the experimental data on gallbladder wall and gallbladder organ tissues demonstrates the applicability of this reality-based variational method for deformation simulation.CONCLUSION: An accurate soft tissue deformation model was developed using material constants identified for gallbladder. The model is suitable for interactive haptic rendering and deformation simulation. This model has potential applications for simulation of other hollow organs.

Resumo Limpo

rpose accur soft tissu deform model import realist surgic simul aim studi develop realitybas gallbladd model determin materi constant repres gallbladd wall mechan propertiesmethod mechan experi porcin gallbladd perform investig tissu deform exponenti strain energi function use describ nonlinear stressstrain behavior gallbladd wall new volumetr function base upon exponenti strain energi function propos model gallbladd organ genet algorithm use identifi materi paramet propos biomechan model experiment dataresult materi constant exponenti strain energi model determin base experiment data deform simul haptic render use propos gallbladd model present comparison deform predict propos model experiment data gallbladd wall gallbladd organ tissu demonstr applic realitybas variat method deform simulationconclus accur soft tissu deform model develop use materi constant identifi gallbladd model suitabl interact haptic render deform simul model potenti applic simul hollow organ

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