IEEE J Biomed Health Inform - Volume Preserved Mass-spring Model with Novel Constraints for Soft Tissue Deformation.

Tópicos

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Resumo

An interactive surgical simulation system needs to meet three main requirements, speed, accuracy and stability. In this paper, we present a stable and accurate method for animating mass-spring systems in real-time. An integration scheme derived from explicit integration is used to obtain interactive realistic animation for a multi-object environment. We explore a predictor-corrector approach by correcting the estimation of the explicit integration in a post-step process. We introduce novel constraints on positions into the Mass-Spring Model (MSM) to model the non-linearity and preserve volume for the realistic simulation of the incompressibility. We verify the proposed MSM by comparing its deformations with the reference deformations of the nonlinear finite element method. Moreover, experiments on porcine organs are designed for the evaluation of the multiobject deformation. Using a pair of freshly harvested porcine liver and gallbladder, the real organ deformations are acquired by computed tomography and used as the reference ground truth. Compared to the porcine model, our model achieves a 1:502 mm mean absolute error measured at landmark locations for cases with small deformation (the largest deformation is 49:109 mm) and a 3:639 mm mean absolute error for cases with large deformation (the largest deformation is 83:137 mm). The changes of volume for the two deformations are limited to 0:030% and 0:057%, respectively. Finally, an implementation in a virtual reality environment for laparoscopic cholecystectomy demonstrates that our model is capable to simulate large deformation and preserve volume in real-time calculations.

Resumo Limpo

interact surgic simul system need meet three main requir speed accuraci stabil paper present stabl accur method anim massspr system realtim integr scheme deriv explicit integr use obtain interact realist anim multiobject environ explor predictorcorrector approach correct estim explicit integr poststep process introduc novel constraint posit massspr model msm model nonlinear preserv volum realist simul incompress verifi propos msm compar deform refer deform nonlinear finit element method moreov experi porcin organ design evalu multiobject deform use pair fresh harvest porcin liver gallbladd real organ deform acquir comput tomographi use refer ground truth compar porcin model model achiev mm mean absolut error measur landmark locat case small deform largest deform mm mm mean absolut error case larg deform largest deform mm chang volum two deform limit respect final implement virtual realiti environ laparoscop cholecystectomi demonstr model capabl simul larg deform preserv volum realtim calcul

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