Download or read book Soft Tissue Modelling and Facial Movement Simulation Using the Finite Element Method written by Yongtao Lu and published by . This book was released on 2010 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soft Tissue Modelling and Facial Movement Using the Finite Element Method written by Yongtao Lu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biomechanical Models for Soft Tissue Simulation written by Walter Maurel and published by Springer. This book was released on 1998-01-19 with total page 200 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 Modelling of Hydrated Soft Tissues Using Hybrid trefftz Finite Elements written by and published by Milan Toma. This book was released on with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Dynamic Finite Element Framework Built Towards the Inverse Problem of Soft Tissues written by and published by . This book was released on 2008 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study seeks to simulate soft tissue behavior with a custom finite element analysis. It is the eventual goal of this team to explore the inverse problem of soft tissues, and this simulation study will play an integral role in that process. It is hoped that new information regarding the elastic properties of soft tissue can be used to diagnose disease processes and improve health care delivery. In this investigation, soft tissue is modeled as a linear, isotropic, elastic, and nearly incompressible material. A dynamic finite element problem was defined consistent with the experimental protocol of harmonic motion imaging, an elasticity imaging technique that utilizes acoustic radiation force to induce localized displacements within soft tissue samples. The finite element equations of motion in this investigation were solved using the Newmark method, an approach commonly used by engineers to determine the dynamic response of structures under the action of any general time-dependent loads. It was found that the displacement results obtained with the Newmark method made physical sense and agreed with the observations of other researchers in this field, suggesting that the current finite element analysis is a suitable simulation of soft tissue behavior.

Download or read book Finite Element Modeling of Soft Tissue Deformation written by Hongjian Shi and published by . This book was released on 2007 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer-aided minimally invasive surgery (MIS) has progressed significantly in the last decade and it has great potential in surgical planning and operations. To limit the damage to nearby healthy tissue, accurate modeling is required of the mechanical behavior of a target soft tissue subject to surgical manipulations. Therefore, the study of soft tissue deformations is important for computer-aided (MIS) in surgical planning and operation, or in developing surgical simulation tools or systems. The image acquisition facilities are also important for prediction accuracy. This dissertation addresses partial differential and integral equations (PDIE) based biomechanical modeling of soft tissue deformations incorporating the specific material properties to characterize the soft tissue responses for certain human interface behaviors. To achieve accurate simulation of real tissue deformations, several biomechanical finite element (FE) models are proposed to characterize liver tissue. The contribution of this work is in theoretical and practical aspects of tissue modeling. High resolution imaging techniques of Micro Computed Tomography (Micro-CT) and Cone Beam Computed Tomography (CBCT) imaging are first proposed to study soft tissue deformation in this dissertation. These high resolution imaging techniques can detect the tissue deformation details in the contact region between the tissue and the probe for small force loads which would be applied to a surgical probe used. Traditional imaging techniques in clinics can only achieve low image resolutions. Very small force loads seen in these procedures can only yield tissue deformation on the few millimeters to sub-millimeter scale. Small variations are hardly to detect. Furthermore, if a model is validated using high resolution images, it implies that the model is true in using the same model for low resolution imaging facilities. The reverse cannot be true since the small variations at the sub-millimeter level cannot be detected. In this dissertation, liver tissue deformations, surface morphological changes, and volume variations are explored and compared from simulations and experiments. The contributions of the dissertation are as follows. For liver tissue, for small force loads (5 grams to tens of grams), the linear elastic model and the neo-Hooke's hyperelastic model are applied and shown to yield some discrepancies among them in simulations and discrepancies between simulations and experiments. The proposed finite element models are verified for liver tissue. A general FE modeling validation system is proposed to verify the applicability of FE models to the soft tissue deformation study. The validation of some FE models is performed visually and quantitatively in several ways in comparison with the actual experimental results. Comparisons among these models are also performed to show their advantages and disadvantages. The method or verification system can be applied for other soft tissues for the finite element analysis of the soft tissue deformation. For brain tissue, an elasticity based model was proposed previously employing local elasticity and Poisson's ratio. It is validated by intraoperative images to show more accurate prediction of brain deformation than the linear elastic model. FE analysis of brain ventricle shape changes was also performed to capture the dynamic variation of the ventricles in author's other works. There, for the safety reasons, the images for brain deformation modeling were from Magnetic Resonance Imaging (MRI) scanning which have been used for brain scanning. The measurement process of material properties involves the tissue desiccation, machine limits, human operation errors, and time factors. The acquired material parameters from measurement devices may have some difference from the tissue used in real state of experiments. Therefore, an experimental and simulation based method to inversely evaluate the material parameters is proposed and compared with the material parameters measured by devices. As known, the finite element method (FEM) is a comprehensive and accurate method used to solve the PDIE characterizing the soft tissue deformation in the three dimensional tissue domain, but the computational task is very large in implementation. To achieve near real time simulation and still a close solution of soft tissue deformation, region-of-interest (ROI) based sub-modeling is proposed and the accuracy of the simulated deformations are explored over concentric regions of interest. Such a ROI based FE modeling is compared to the FE modeling over the whole tissue and its efficiency is shown and as well as its influence in practical applications such as endoscopic surgical simulation.

Download or read book Finite Element Method and Medical Imaging Techniques in Bone Biomechanics written by Rabeb Ben Kahla and published by John Wiley & Sons. This book was released on 2019-12-05 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital models based on data from medical images have recently become widespread in the field of biomechanics. This book summarizes medical imaging techniques and processing procedures, both of which are necessary for creating bone models with finite element methods. Chapter 1 introduces the main principles and the application of the most commonly used medical imaging techniques. Chapter 2 describes the major methods and steps of medical image analysis and processing. Chapter 3 presents a brief review of recent studies on reconstructed finite element bone models, based on medical images. Finally, Chapter 4 reveals the digital results obtained for the main bone sites that have been targeted by finite element modeling in recent years.

Download or read book Biomechanical Modelling of Soft Tissues Using Finite Element Method written by Margarita Satraki and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soft Tissue Simulation in Craniofacial Surgery Using Finite Element Models written by Unaizah Hanum Obaidellah and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Finite Element Head Injury Model Theory development and results written by T. A. Shugar and published by . This book was released on 1977 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Hyperelastic Modeling and Soft Tissue Growth Integrated with the Smoothed Finite Element Method SFEM written by Minh Tuan Duong and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biological Soft Tissue Characterisation Using the Finite Element Method written by Ben Stungo and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tissue Modeling and Analyzing for Cranium Brain with Finite Element Method written by Xianfang Yue and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Efficient Techniques for Soft Tissue Modeling and Simulation written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Anatomically Accurate Biomechanical Model of the Human Face for Simulating Facial Expressions written by Alice Hung and published by . This book was released on 2012 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Facial animations are often generated using geometric techniques that disregard the underlying mechanics of facial structures. This thesis presents an anatomically accurate biomechanical model of the face for simulating facial expressions. The computational model uses highly accurate geometric descriptions of skin, facial muscles and the skull surface based on segmented data derived from the Visible Human cryosections published by the National US Library of Medicine. Experimental observations made using an ultrasound imaging system revealed that the superficial soft tissue layer of the face deforms as a single entity. The information acquired led to the creation of a single superficial layer of tissue continuum. Kinematical relations of the computational model were formulated using the theory of finite elasticity to predict large deformations of facial soft tissue structures. The equations governing mechanics of deformable bodies, the static Cauchy equation, and other auxiliary equations were numerically solved using the finite element method. The use of Hermite family elements in the finite element model ensures equilibrium conditions are naturally satisfied, thus more accurate solutions can be obtained. Accurate fibre orientations of facial muscles were derived from reconstructed 3D muscle models and embedded in the continuum. A novel grid based method was employed to determine the activation field of the continuum for simulating contraction of facial muscles. A frictionless contact constraint was imposed via a penalty method to prevent penetrations of facial soft tissues into the skull. An efficient customisation framework was also developed to streamline the processes for generating subject-specific models of facial structures. Furthermore, an investigation was undertaken to assess the suitability of using a coupled membrane-solid model for mechanical analyses of skin and subcutaneous tissues. Simulation results from the coupled model revealed that the assumptions made in membrane mechanics theory lead to significant errors in predicting tissue compressions. Facial expressions were successfully generated for a number of individuals using the optimal activation values inferred from experimental data followed by a validation study to assess the predictability of the model. The detailed biomechanical computational model presented in this thesis has a multitude of potential applications, ranging from facial animation in the entertainment industry to being a clinical tool in facial reconstructive procedures.

Download or read book A multiresolution nonlinear finite element approach to real time simulation of soft tissue deformation with haptic feedback written by Alessandro Faraci and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: