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Now showing 1 - 10 of 15
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    Real-Time Guidance and Anatomical Information by Image Projection onto Patients
    (The Eurographics Association, 2016) Edwards, Marc R.; Pop, Serban R.; John, Nigel W.; Ritsos, Panagiotis D.; Avis, Nick; Stefan Bruckner and Bernhard Preim and Anna Vilanova and Helwig Hauser and Anja Hennemuth and Arvid Lundervold
    The Image Projection onto Patients (IPoP) system is work in progress intended to assist medical practitioners perform procedures such as biopsies, or provide a novel anatomical education tool, by projecting anatomy and other relevant information from the operating room directly onto a patient's skin. This approach is not currently used widely in hospitals but has the benefit of providing effective procedure guidance without the practitioner having to look away from the patient. Developmental work towards the alpha-phase of IPoP is presented including tracking methods for tools such as biopsy needles, patient tracking, image registration and problems encountered with the multi-mirror effect.
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    Appearance Modelling of Living Human Tissues
    (© 2019 Eurographics ‐ The European Association for Computer Graphics and John Wiley & Sons Ltd, 2019) Nunes, Augusto L.P.; Maciel, Anderson; Meyer, Gary W.; John, Nigel W.; Baranoski, Gladimir V.G.; Walter, Marcelo; Chen, Min and Benes, Bedrich
    The visual fidelity of realistic renderings in Computer Graphics depends fundamentally upon how we model the appearance of objects resulting from the interaction between light and matter reaching the eye. In this paper, we survey the research addressing appearance modelling of living human tissue. Among the many classes of natural materials already researched in Computer Graphics, living human tissues such as blood and skin have recently seen an increase in attention from graphics research. There is already an incipient but substantial body of literature on this topic, but we also lack a structured review as presented here. We introduce a classification for the approaches using the four types of human tissues as classifiers. We show a growing trend of solutions that use first principles from Physics and Biology as fundamental knowledge upon which the models are built. The organic quality of visual results provided by these approaches is mainly determined by the optical properties of biophysical components interacting with light. Beyond just picture making, these models can be used in predictive simulations, with the potential for impact in many other areas.The visual fidelity of realistic renderings in Computer Graphics depends fundamentally upon how we model the appearance of objects resulting from the inter action between light and matter reaching the eye. In this paper, we survey the research addressing appearance modelling of living human tissue. Among the many classes of natural materials already researched in Computer Graphics, living human tissues such as blood and skin have recently seen an increase in attention from graphics research. There is already an incipient but substantial body of literature on this topic, but we also lack a structured review as presented here. We introduce a classification for the approaches using the four types of human tissues as classifiers. We show a growing trend of solutions that use first principles from Physics and Biology as fundamental knowledge upon which the models are built.
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    Chemical Education using Feelable Molecules
    (The Eurographics Association, 2009) Davies, R. Andrew; Maskery, James S.; John, Nigel W.; Dieter W. Fellner and Alexei Sourin and Johannes Behr and Krzysztof Walczak
    Two different approaches for the preparation of novel cost-effective molecular haptic applications (Figure 1) are described. The former utilises Perl scripting within a commercial molecular modelling package to generate static / animated H3D scene graphs for haptic CPK space-filling atomic perception. Within the second approach, key chemical concepts such as reactivity, aciditity and periodicity can be investigated using prototype H3D user interfaces.
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    An Endoscope Interface for Immersive Virtual Reality
    (The Eurographics Association, 2020) John, Nigel W.; Day, Thomas W.; Wardle, Terrence; Kozlíková, Barbora and Krone, Michael and Smit, Noeska and Nieselt, Kay and Raidou, Renata Georgia
    This is a work in progress paper that describes a novel endoscope interface designed for use in an immersive virtual reality surgical simulator. We use an affordable off the shelf head mounted display to recreate the operating theatre environment. A hand held controller has been adapted so that it feels like the trainee is holding an endoscope controller with the same functionality. The simulator allows the endoscope shaft to be inserted into a virtual patient and pushed forward to a target position. The paper describes how we have built this surgical simulator with the intention of carrying out a full clinical study in the near future.
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    ImaGINe-S: Imaging Guided Interventional Needle Simulation
    (The Eurographics Association, 2009) Bello, Fernando; Bulpitt, Andrew; Gould, Derek A.; Holbrey, Richard; Hunt, Carrie; How, Thien; John, Nigel W.; Johnson, Sheena; Phillips, Roger; Sinha, Amrita; Vidal, Franck; Villard, Pierre-Frédéric; Woolnough, Helen; Zhang, Yan; K. Bühler and D. Bartz
    We present an integrated system for training visceral needle puncture procedures. Our aim is to provide a cost effective and validated training tool that uses actual patient data to enable interventional radiology trainees to learn how to carry out image-guided needle puncture. The input data required is a computed tomography scan of the patient that is used to create the patient specific models. Force measurements have been made on real tissue and the resulting data is incorporated into the simulator. Respiration and soft tissue deformations are also carried out to further improve the fidelity of the simulator.
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    Challenges and Technologies for Low Cost Wheelchair Simulation
    (The Eurographics Association, 2015) Headleand, Christopher J.; Day, Thomas; Pop, Serban R.; Ritsos, Panagiotis D.; John, Nigel W.; Katja Bühler and Lars Linsen and Nigel W. John
    The use of electric wheelchairs is inherently risky, as collisions due to lack of control can result in injury for the user, but also potentially for other pedestrians. Introducing new users to powered chairs via virtual reality (VR) provides one possible solution, as it eliminates the risks inherent to the real world during training. However, traditionally simulator technology has been too expensive to make VR a financially viable solution. Also, current simulators lack the natural interaction possible in the real world, limiting their operational value. We present the early stages of a VR, electric wheelchair simulator built using low-cost, consumer level gaming hardware. The simulator makes use use of the the Leap Motion, to provide a level of interaction with the virtual world which has not previously been demonstrated in wheelchair training simulators. Furthermore, the Occulous Rift provides an immersive experience suitable for our training application.
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    Frontmatter: Eurographics Workshop on Visual Computing for Biology and Medicine
    (The Eurographics Association, 2015) Bühler, Katja; Linsen, Lars; John, Nigel W.; Katja Bühler and Lars Linsen and Nigel W. John
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    Virtual Femoral Palpation Simulation for Interventional Radiology Training
    (The Eurographics Association, 2010) Coles, Timothy R.; Gould, Derek A.; John, Nigel W.; Caldwell, Darwin G.; John Collomosse and Ian Grimstead
    A femoral palpation simulation for training purposes has been developed to simulate the initial steps of the Seldinger technique which is currently neglected in both commercial and academic medical training simulations. The simulation co-locates visual and haptic feedback through the use of an augmented reality video see-through visualisation whilst requiring no headwear to be worn. The visual simulation implements shadowing of the users real hand in the virtual world to increase depth perception, textured deformable tissue and visually realistic cloth, whilst haptic feedback combines both tactile and force feedback based on in-vivo measured force and tactile data. The simulation is a work in progress and is to undergo validation.
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    A Haptics-enabled Simulator for Transperineal Ultrasound-Guided Biopsy
    (The Eurographics Association, 2015) Ritsos, Panagiotis D.; Edwards, Marc R.; Shergill, Iqbal S.; John, Nigel W.; Katja Bühler and Lars Linsen and Nigel W. John
    We present the development of a transperineal prostate biopsy, with high fidelity haptic feedback. We describe our current prototype, which is using physical props and a Geomagic Touch. In addition, we discuss a method for collecting in vitro axial needle forces, for programming haptic feedback, along with implemented an forthcoming features such as a display of 2D ultrasonic images for targeting, biopsy needle bending, prostate bleeding and calcification. Our ultimate goal is to provide an affordable high-fidelity simulation by integrating contemporary off-the-shelf technology components.
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    Touching The Invisible - Molecular Haptics
    (The Eurographics Association, 2009) Davies, R. Andrew; Maskery, James S.; John, Nigel W.; Wen Tang and John Collomosse
    Novel, simple, cost-effective applications combining haptics and computer graphics for the study of key chemical concepts such as reactivity and periodicity at AS/A-level and undergraduate level are described.