Download or read book Advanced Soft Tissue Modeling for Surgical Simulation and Telemedicine written by and published by . This book was released on 2006 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this project were to develop computer based models of soft tissues that could eventually be integrated into virtual reality-based surgical simulators. To that end, we have developed a number of computer algorithms that span the scales from the microstructural to the phenomenological, and from 1-D to 3-D. For the 1-D case, we have developed a model of fractional order viscoelasticity. For the 3-D case, we have developed an invariant-based formulation of dispersed isotropy and implemented it in a model of blood vessel. Although the later employs as statistical measure of fiber dispersion, both a essentially phenomenological models. To implement tissue microstructure, we developed a micromechanical model based on the General Method of Cells. Through this model, we were able to model fiber-matrix interactions explicitly. These models are currently being validated and implemented into larger organ simulations.

Download or read book Advanced Soft Tissue for Telemedicine and Surgical Simulation written by and published by . This book was released on 2006 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this project were to develop computer based models of soft tissues that could eventually be integrated into virtual reality-based surgical simulators. To that end, we have developed a number of computer algorithms that span the scales from the microstructural to the phenomenological, and from 1-D to 3-D. For the 1-D case, we have developed a model of fractional order viscoelasticity. For the 3-D case, we have developed an invariant-based formulation of dispersed isotropy and implemented it in a model of blood vessel. Although the later employs as statistical measure of fiber dispersion, both a essentially phenomenological models. To implement tissue microstructure, we developed a micromechanical model based on the General Method of Cells. Through this model, we were able to model fiber-matrix interactions explicitly. These models are currently being validated and implemented into larger organ simulations.

Download or read book Surgery Simulation and Soft Tissue Modeling written by Nicholas Ayache and published by Springer Science & Business Media. This book was released on 2003-06-04 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the International Symposium on Surgery Simulation and Soft Tissue Modeling, IS4TM 2003, held in Juan-Les-Pins, France in June 2003. The 33 revised full papers presented together with 3 invited papers were carefully reviewed and selected from 45 submissions. The papers are organized in topical sections on soft tissue models, haptic rendering, cardiac modeling, and patient specific simulators.

Download or read book Surgery Simulation and Soft Tissue Modeling written by Nicholas Ayache and published by Springer. This book was released on 2014-03-12 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the International Symposium on Surgery Simulation and Soft Tissue Modeling, IS4TM 2003, held in Juan-Les-Pins, France in June 2003. The 33 revised full papers presented together with 3 invited papers were carefully reviewed and selected from 45 submissions. The papers are organized in topical sections on soft tissue models, haptic rendering, cardiac modeling, and patient specific simulators.

Download or read book Enabling Technologies for Advanced Soft Tissue Modeling written by and published by . This book was released on 2002 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soft tissue properties represent a major and significant unknown in the domain of medical modeling and simulation. This program presents a 4 year research effort in defining tissue characteristics of three distinct organs - liver, spleen, and kidney- in vivo. Over the course of this program, we will use novel methods of tissue interrogation to characterize non-linear behavior during slow deformations, as would commonly be seen during surgical manipulations. We will then develop mathematical models which can be optimized to permit near real-time representations of organ behaviors, including the boundary characteristics of organs in situ. During this first year, we examined the in vivo deformations of porcine liver using two different instruments, and determined close agreement between the methods. We initiated mathematical models of our experimental measurements. We also established an experimental standard to compare different datasets, and to measure accuracy of mathematical models of tissue properties. These data were not previously known.

Download or read book Real time Knowledge based Fuzzy Logic Model for Soft Tissue Deformation written by Joey Sing Yee Tan and published by Springer. This book was released on 2019-04-06 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a real-time and knowledge-based fuzzy logic model for soft tissue deformation. The demand for surgical simulation continues to grow, as there is a major bottleneck in surgical simulation designation and every patient is unique. Deformable models, the core of surgical simulation, play a crucial role in surgical simulation designation. Accordingly, this book (1) presents an improved mass spring model to simulate soft tissue deformation for surgery simulation; (2) ensures the accuracy of simulation by redesigning the underlying Mass Spring Model (MSM) for liver deformation, using three different fuzzy knowledge-based approaches to determine the parameters of the MSM; (3) demonstrates how data in Central Processing Unit (CPU) memory can be structured to allow coalescing according to a set of Graphical Processing Unit (GPU)-dependent alignment rules; and (4) implements heterogeneous parallel programming for the distribution of grid threats for Computer Unified Device Architecture (CUDA)-based GPU computing.

Download or read book Soft Tissue Biomechanical Modeling for Computer Assisted Surgery written by Yohan Payan and published by Springer Science & Business Media. This book was released on 2012-04-27 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume focuses on the biomechanical modeling of biological tissues in the context of Computer Assisted Surgery (CAS). More specifically, deformable soft tissues are addressed since they are the subject of the most recent developments in this field. The pioneering works on this CAS topic date from the 1980's, with applications in orthopaedics and biomechanical models of bones. More recently, however, biomechanical models of soft tissues have been proposed since most of the human body is made of soft organs that can be deformed by the surgical gesture. Such models are much more complicated to handle since the tissues can be subject to large deformations (non-linear geometrical framework) as well as complex stress/strain relationships (non-linear mechanical framework). Part 1 of the volume presents biomechanical models that have been developed in a CAS context and used during surgery. This is particularly new since most of the soft tissues models already proposed concern Computer Assisted Planning, with a pre-operative use of the models. Then, the volume addresses the two key issues raised for an intra-operative use of soft tissues models, namely (Part 2) “how to estimate the in vivo mechanical behavior of the tissues?” (i.e. what are the values of the mechanical parameters that can deliver realistic patient-specific behavior?) and (Part 3) “how to build a modeling platform that provides generic real-time (or at least interactive-time) numerical simulations?”

Download or read book A Volumetric Mesh free Deformation Method for Surgical Simulation in Virtual Environments written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Surgical simulation for medical training and education is increasingly perceived as a valuable supplement to traditional teaching methods. Recently, soft tissue modeling has become an important research area for surgical simulation and robot-assisted surgery. This area requires high-performance computing and advanced computer graphics algorithms. A majority of previous simulation methods in computer graphics use 2D or 3D meshes. Most of these approaches are based on mass-spring systems, the Finite Element Model (FEM), the Finite Difference Model (FDM) or Boundary Element Model (BEM). In mesh-based approaches, complex physical effects, such as melting, solidifying, splitting or fusion, pose great challenges in terms of restructuring the data set. Additionally, under large deformations the original meshes may become arbitrarily ill-conditioned. Mesh-free methods were developed to establish a system of algebraic equations for the whole domain without using a predefined mesh, which omits explicit connectivity information and thus solves many of the problems with mesh-based systems. This thesis proposes a Point-Based Volumetric Deformation Method (PBVD). It has the advantage that it is very suitable for tissue structure changes occurring merely during cutting and probing operations. Notably such topology changes are hard to handle utilizing mesh-based deformation models. PBVD is not only accurate because it preserves the physical material properties of the deformable object, such as Young's modulus and Poisson's ratio (as the FEM model does), but it is also faster than the FEM model. The PBVD method is developed based on an open-source frame work, SOFA, which is designed especially for surgical simulation, and makes it convenient to compare different deformation algorithms. Presented results show the high fidelity of the visual simulations generated by the PBVD method and its better real-time performance than FEM model.

Download or read book Progressive Cutting with Minimal New Element Creation of Soft Tissue Models for Interactive Surgical Simulation written by Andrew B. Mor and published by . This book was released on 2001 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "This thesis deals with the modification of finite element models used in surgical simulation. Surgical simulation offers the promise of enhanced medical training and education. It can provide a more realistic learning environment than many of the methodologies employed today while reducing costs. It also increases the variability of pathologies presented to the student, and can be used for continuing medical education. Simulators can also gain a place in the medical practice, to rehearse difficult or uncommon procedures. While a good deal of work has been done on the underlying soft tissue simulation, cutting and interacting with the model has been relatively ignored. In this thesis, we present a method for simulating cutting of soft tissue within a physically based surgical simulator. The technique works on subdividing tetrahedral meshes while impacting model and simulator efficiency as little as possible. Model stability is addresses [sic] so that the new, cut, model does not cause the simulation to become unstable. Also, within the framework the interactive simulator demonstrated, the user is able to palpate, grasp, and puncture the model."

Download or read book Biomechanical Models for Soft Tissue Simulation written by Walter Maurel and published by Springer Science & Business Media. This book was released on 2013-11-22 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview of biomechanical modeling of human soft tissue using nonlinear theoretical mechanics and incremental finite element methods, useful for computer simulation of the human musculoskeletal system.

Download or read book Performance Evaluation of Real time Soft Tissue Models for Surgical Simulation written by Vincent Mora and published by . This book was released on 2007 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling and Simulation for Virtual Orthopaedic Surgery written by Xiaoyi Chi and published by . This book was released on 2006 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This dissertation presents a framework on developing geometrical modeling and physically based modeling methods towards a virtual reality based surgery simulation system. The development of simulation is divided into two aspects: (1) virtual bone (hard tissue) surgery, and (2) virtual soft tissue surgery...Also, this dissertation presents a study on physically based modeling and simulation of soft tissue deformation, with the goal of producing realistic, real-time effects during simulation"--Abstract, leaf iii.

Download or read book An Investigation of Soft Tissue Deformation Using Finite Element Modelling for a Virtual Reality Based Endoscopic Surgical Simulator written by Amer Alsaraira and published by . This book was released on 2009 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simulations of grasping and cutting were performed on three types of tubular segment: surface, hollow and solid. Triangular and quadrilateral elements were used to mesh the surface type, while tetrahedral and hexahedral elements were used to mesh the hollow and solid types. Three different integration methods within FEM were used to calculate the deformation of the segment. The three integration methods were the static implicit, dynamic implicit, and dynamic explicit methods. In the simulation of grapsing the segment, it was found that the visual response of grasping was acceptable using the three integration methods. However, the computational time of grasping the segment using the dynamic explicit method was lower than the computational time using the static and dynamic implicit methods. Therefore, the explicit method is the preferred choice for performing the analysis of soft tissue deformation, and was used to simulate segment cutting. Using the explicit method, three different approaches were used to perform cutting on the virtual anatomy segment. In the first approach, a defined level of logarithmic strain was used to define elements to be deleted during simulated cutting. In this approach, cutting was performed by deleting elements with an isotropic elastic material property with and without defined cutting area (DCA). In the second approach, the cutting was simulated by deleting elements with a traction elastic material property with DCA. The elements were deleted in this approach because as they deformed, they lost their stiffness and caused failure of the elements, leading to degradation of the elements. In the third approach, the cutting of the segment was based on splitting the segment into two parts without the deletion of elements. It was found that these approaches produce an effective simulation of cutting a virtual anatomy segment for most of the three types of the segment in terms of visual response and computational time. The modeling carried out in this research suggests that FEM has significant potential to add realism to the virtual reality laparoscopic simulation and thus to enable the development of instrument-tissue manipulation skills in surgeons in training. In the case of grasping, FEM can clearly show the visual effect of deformation on the tissue grasped and the surrounding tissue. In relation to cutting, FEM can clearly show what is cut and how the surrounding tissue is affected.

Download or read book Annual Review of Cybertherapy and Telemedicine 2009 written by B. K. Wiederhold and published by IOS Press. This book was released on 2009 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cybertherapy - the provision of healthcare services using advanced technologies - can help improve the lives of many of us, both patients and health professionals, while tackling the challenges to healthcare systems. This book is divided in four main sections: Critical Reviews; Evaluation Studies; Original Research; and Clinical Observations.

Download or read book Surgical Scene Generation for Virtual Reality Based Training in Medicine written by Matthias Harders and published by Springer Science & Business Media. This book was released on 2008-03-30 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference book is for anyone involved in generating surgical training scenarios, as well as in VR-based training in general. It examines the main components required to define a scenario, in the context of surgical scene generation: Generation of the scene geometry; modelling of organ appearance; definition of biomechanical parameters. The book is the ideal reference for any reader involved in generating training scenarios, as well as in VR-based training in general.

Download or read book Computational Modeling of Tissue Surgery written by M. E. Zeman and published by Blackwell Publishers. This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Working within the overall context of biomechanics, researchers from various disciplines offer information on the different methods for modeling, simulating, and analysing hard and soft tissue as an aid to developing tools that can provide a meaningful input in medical practice.

Download or read book A Viscoelastic Soft Tissue Model for Haptic Surgical Simulation written by Iman Brouwer and published by . This book was released on 2007 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: