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Soft tissue simulation with bimanual force feedback is one of the main research topics toward practical application of surgery simulation. A method for the simulation of soft object using Mass-Spring model is presented to deform human tissue in the bimanual haptic feedback environment. A multi-thread simulation framework is employed to support real-time force feedback calculation and the deformation...
An improved realistic mass-spring model, which is mainly based on the 3D finite strain nonlinear anisotropic elasticity theory, is presented for virtual reality based surgery simulation. Compared with the conversional mass-spring model, the proposed model is able to describe typical behaviors of living tissues such as incompressibility, nonlinearity and anisotropy. The nonlinear viscoelasticity is...
Simulating the behavior of elastic objects is an important research in the field of virtual reality. Visual simulation of soft tissue deformation is the core part of the surgery simulation system. However, there is not a uniform deformable model. To choose a suitable model for surgery simulation, a classification of deformation models is offered in this paper. The deformable model can divide into...
The advancement in computer technologies and the transference of these technologies to simulators for medical education continues to be a driving force in medical education. The complexities of surgical training and the emergence of minimally invasive surgery (MIS) as a primary surgical mode have pushed the surgical simulator to the forefront of surgical education. Simulators are now developed by...
High quality information has a significant impact on improving operation performance and patient satisfaction, as well as resolving patient disputes. Based on the analysis of the perioperative process, information quality is considered as an important contributory factor in improving patient throughput. In this paper, we propose a conceptual framework to use computer simulations in modeling information...
A novel approach to the simulation of soft tissue cutting in a virtual reality endoscopic simulator is presented for applications in surgical training and education. This approach is based on an improved mass-spring model and the use of computational geometry. A virtual spring is introduced to compensate the weakness of the conventional mass-spring model, and a detection algorithm utilizing decomposition...
Interactive simulation of nonlinear deformable bodies with haptic feedback is particularly challenging as the corresponding coupled nonlinear equations must be solved at a high rate of 1 kHz. With increasing demand on the complexity of the models and scenarios that must be simulated to develop interactive applications such as surgical simulators, and given the current state of hardware, a nai??ve...
This paper deals with the rendering issues of producing a realistic surgery simulation in real-time. In general, the visual fidelity of the simulator determines the degree of realism experienced by users. On top of the tissue, there is a mucous layer which is wet and semi-transparent. It significantly influences the surface appearance by reflecting and scattering incoming light rays. This paper describes...
Simulating the soft tissue deformation based on bone-related planning is one of the most difficult issues in generating realistic motion of soft tissues. The difficulty of this problem arises from unclear boundary conditions. In facial soft tissue deformation, the boundary conditions of the finite element modeling are related to the bone movements. In order to better map the bone movements to the...
In this work we present PhyNeSS - a novel physics-driven neural networks-based surgical simulation system which, for the first time, combines the complexity and accuracy of physics-based non-linear soft tissue models and commercial finite element codes with the high speed of execution of machine learned neural networks. While soft tissue is inherently nonlinear, physics-based simulation of nonlinear...
Combining the exiting bone scaffold design system and augmented reality interactive technology, this paper presents an aided planning and test interactive system frame for defective bone repair surgery, and develops the prototype system based on it. The system allows the clinician to carry out the surgical planning and simulation directly using the virtual model, after designing the CAD model of defective...
Surgical simulations are highly desired nowadays, since those can help surgeon trainees to practice and evaluate their surgical skills. A key element for the surgical simulation is the ability to simulate it realistic and real-time. In this paper, an effective method is proposed to achieve the realistic simulation of tissue cutting, and it is also real-time which is important to us. The method is...
Determining the optimal allocation and number of beds by clinical speciality in large university hospitals is rather complex. The complexity stems from the interdependence of numerous factors and variables that affect the result. This case study documents a computer simulation technique used to predict the demand for and allocation of beds by specialty based on medical and surgical service utilization...
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