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检索条件"任意字段=Conference on Visualization in Biomedical Computing"

共 893 条记录，以下是631-640 订阅

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Partial surface integration based on variational implicit functions and surfaces for 3D model building

Partial surface integration based on variational implicit fu...

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International conference on 3D Imaging, Modeling, Processing, visualization and Transmission (3DIMPVT)

作者： P. Claes D. Vandermeulen L. Van Gool P. Suetens ESAT/PSI/Medical Image Computing Katholieke Universiteit Leuven Belgium ESAT/PSI/VISICS Katholieke Universiteit Leuven Belgium

Most three-dimensional acquisition systems generate several partial reconstructions that have to be registered and integrated for building a complete 3D model. In this paper, we propose a volumetric shape integration method, consisting of weighted signed distance functions represented as variational implicit functions (VIF) or surfaces (VIS). Texture integration is solved similarly by using three weighted color junctions also based on VIFs. Using these continuous (not grid-based) representations solves current limitations of volumetric methods: no memory inefficient and resolution limiting grid representation is required. The built-in smoothing properties of the VIS representations also improve the robustness of the final integration against noise in the input data. Experimental results are performed on real-live, noiseless and noisy synthetic data of human faces in order to show the robustness and accuracy of the integration algorithm.

关键词： biomedical imaging Image reconstruction Shape Noise robustness Data mining Surface reconstruction Colored noise Smoothing methods Humans Face

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Illustrative display of hidden iso-surface structures

Illustrative display of hidden iso-surface structures

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IEEE conference on visualization

作者： J. Fischer D. Bartz W. Strasser Visual Computing for Medicine University of Tübingen Germany WSI/GRIS University of Tübingen

Indirect volume rendering is a widespread method for the display of volume datasets. It is based on the extraction of polygonal iso-surfaces from volumetric data, which are then rendered using conventional rasterization methods. Whereas this rendering approach is fast and relatively easy to implement, it cannot easily provide an understandable display of structures occluded by the directly visible iso-surface. Simple approaches like alpha-blending for transparency when drawing the iso-surface often generate a visually complex output, which is difficult to interpret. Moreover, such methods can significantly increase the computational complexity of the rendering process. In this paper, we therefore propose a new approach for the illustrative indirect rendering of volume data in real-time. This algorithm emphasizes the silhouette of objects represented by the iso-surface. Additionally, shading intensities on objects are reproduced with a monochrome hatching technique. Using a specially designed two-pass rendering process, structures behind the front layer of the iso-surface are automatically extracted with a depth peeling method. The shapes of these hidden structures are also displayed as silhouette outlines. As an additional option, the geometry of explicitly specified inner objects can be displayed with constant translucency. Although these inner objects always remain visible, a specific shading and depth attenuation method is used to convey the depth relationships. We describe the implementation of the algorithm, which exploits the programmability of state-of-the-art graphics processing units (GPUs). The algorithm described in this paper does not require any preprocessing of the input data or a manual definition of inner structures. Since the presented method works on iso-surfaces, which are stored as polygonal datasets, it can also be applied to other types of polygonal models.

关键词： Displays Rendering (computer graphics) Geometry biomedical imaging Shape Data mining Computer graphics Engines Image generation Isosurfaces

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Robust and accurate partial surface registration based on variational implicit surfaces for automatic 3D model building

Robust and accurate partial surface registration based on va...

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International conference on 3D Imaging, Modeling, Processing, visualization and Transmission (3DIMPVT)

作者： P. Claes D. Vandermeulen L. Van Gool P. Suetens ESAT/PSI/Medical Image Computing Katholieke Universiteit Leuven Belgium ESAT/PSI/VISICS Katholieke Universiteit Leuven Belgium

Three-dimensional models are often assembled from several partial reconstructions from unknown viewpoints. In order to provide a fully automatic, robust and accurate method for aligning and integrating partial reconstructions without any prior knowledge of the relative viewpoints of the sensor or the geometry of the imaging process, we propose a 4-step registration and integration algorithm based on a common Variational Implicit Surface (VIS) representation of the partial surface reconstructions. First, a global crude registration without a priori knowledge is performed followed by a pose refinement of partial reconstruction pairs. Pair-wise registrations are converted into a multi-view registration, before a final integration of the reconstructions into one entity or model occurs. Furthermore, making use of the smoothing properties of the VIS representations, the algorithm proves to be robust against noise in the reconstruction data. Experimental results on real-live, as well as noiseless and noisy simulated data are presented to show the feasibility, the accuracy and robustness of our registration scheme.

关键词： Image reconstruction Surface reconstruction biomedical imaging Geometry Smoothing methods Noise robustness Cameras Image sensors Assembly systems Calibration

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biomedical signal visualization and analysis system devlopment utilizing open source software and a computer cluster

Biomedical signal visualization and analysis system devlopme...

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Proceedings of the IEEE 30th Annual Northeast Bioengineering conference

作者： Tillett, Jason C. Phillips, Daniel B. Rochester Institute of Technology Rochester NY 14623 United States

The complex biomedical signals using Open Source software and Computer Cluster (CC) was described. The system was based on Open Source software at both system and application level to facilitate flexible development of complex computing paradigm. The system consisted of workstation or visualization terminal (VT) and CC. The analysis involved simple procedure which determined 200 point Fast Fourier Transform (FFT). The results show that the analysis required system level communication, generic data acquisition support and clinician interface issues.

关键词： biomedical engineering

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The visualization of myocardial strain for the improved analysis of cardiac mechanics 04

The visualization of myocardial strain for the improved anal...

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Proceedings GRAPHITE 2004 - 2nd International conference on Computer Graphics and Interactive Techniques in Australasia and South East Asia

作者： Wünsche, Burkhard C. Lobb, Richard Young, Alistair A. Division for Biomedical Imaging Department of Computer Science University of Auckland Auckland New Zealand Department of Anatomy with Radiology University of Auckland Auckland New Zealand

ISBN: (纸本)1581138849

Heart diseases cause considerable morbidity and the prognosis after heart failure is poor. An improved understanding of cardiac mechanics is necessary to advance the diagnosis and treatment of heart diseases. This paper presents techniques for visualizing and evaluating biomedical finite element models and demonstrates their application by using as an example models of a healthy and a diseased human left ventricle. The following contributions are made: we apply techniques traditionally used in solid mechanics and computational fluid dynamics to biomedical data and suggest some improvements and modifications. We introduce a novel algorithm for computing isosurfaces for scalar fields defined over curvilinear finite elements. We obtain new insight into the mechanics of the healthy and the diseased left ventricle and we facilitate the understanding of the complex deformation of the heart muscle by novel visualizations.

关键词： Heart valve prostheses

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Multidimensional volume visualization for PC-based microsurgical simulation system

Multidimensional volume visualization for PC-based microsurg...

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Proceedings VRCAI 2004 - ACM SIGGRAPH International conference on Virtual Reality Continuum and its Applications in Industry

作者： Wang, Zhenlan Chui, Chee-Kong Cai, Yiyu Ang, Chuan-Heng School of Computing National University of Singapore Singapore Singapore Graduate School of Frontier Sciences University of Tokyo Japan School of MPE Nanyang Technological University Singapore Singapore Biomedical Imaging Lab Institute for Infocomm Research Singapore Singapore

ISBN: (纸本)1581138849

Microsurgery is a highly complex surgical procedure on small body parts performed by a dedicated surgical team. An operating microscope is typically used to obtain a precise view of the soft tissues. The complexity of the microsurgical procedure makes it a suitable application of virtual/augmented reality technology for training purpose. In this paper, we present an overview of our simulator and then describe the visualization work that reconstructs the magnified view of the operating area from medical images. Our 3D linear level octree(LLO) based volume rendering algorithm, and newly proposed dynamic linear level octree (DLLO) based 4D volume rendering algorithm are integrated with a texture-based renderer to form the visualization component. In contrast to the conventional algorithms, our method achieves fast rendering speed, reduced requirement for texture bandwidth and combined surface-volume rendering for realistic and interactive PC-based medical simulations.

关键词： Surgical equipment

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biomedical signal visualization and analysis system development utilizing open source software and a computer cluster

Biomedical signal visualization and analysis system developm...

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Annual Northeast Bioengineering conference

作者： J.C. Tillett D.B. Phillips Rochester Institute of Technology Rochester NY USA

We present progress toward developing a "clinician friendly" system for analysis of complex biomedical signals that leverages a high-performance computer cluster and open source software.

关键词： Signal analysis Open source software biomedical computing Concurrent computing Packaging Data visualization Biology computing Computer architecture Switches Electroencephalography

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Modern visualisation tools for research and education in biomechanics

Modern visualisation tools for research and education in bio...

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Proceedings - Eighth International conference on Information Visualisation, IV 2004

作者： Van Sint Jan, Serge Viceconti, Marco Clapworthy, Gordon Belgium Laboratorio di Tecnologia Medica Istituti Ortopedici Rizzoli via di Barbiano 1/10 Bologna 40136 Italy Dept. of Computing University of Luton Luton LU1 3JU United Kingdom

The DataManager presented in this paper allows the multimodal visualisation of heterogeneous data originating from the biomedical field and, more particularly, Biomechanics. In the latter, the aim is to increase our understanding of the musculo-skeletal system, and to achieve this, numerous disparate data must be collected and combined. Previously, no software tool fully allowed such integration, but the DataManager and its development environment (the MAP) now provide an answer to that problem. This paper presents the current visualisation and data processing tools available from the DataManager. Its usefulness for research, educational and clinical activities will be demonstrated. The system developers hope that the data management mechanisms available within the software will stimulate data sharing between scientists and will encourage them to participate in enhancing the system by integrating their own software tools.

关键词： Biomechanics

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visualization, planning, and monitoring software for MRI-guided prostate intervention robot

Visualization, planning, and monitoring software for MRI-gui...

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Medical Image computing and Computer-Assisted Intervention, MICCAI 2004 - 7th International conference, Proceedings

作者： Balogh, Emese Deguet, Anton Susil, Robert G. Krieger, Axel Viswanathan, Anand Ménard, Cynthia Coleman, Jonathan A. Fichtinger, Gabor Engineering Research Center Johns Hopkins University Baltimore MD United States Dept. of Biomedical Engineering Johns Hopkins University Baltimore MD United States Dept. of Radiology Johns Hopkins University Baltimore MD United States Urologic Oncology Branch NCI National Institutes of Health Bethesda MD United States Radiation Oncology Branch NCI National Institutes of Health Bethesda MD United States Dept. of Informatics University of Szeged Szeged Hungary

This paper reports an interactive software interface for visualization, planning, and monitoring of intra-prostatic needle placement procedures performed with a robotic assistant device inside standard cylindrical high-field magnetic resonance imaging (MRI) scanner. We use anatomical visualization and image processing techniques to plan the process and apply active tracking coils to localize the robot in real-time to monitor its motion relative to the anatomy. The interventional system is in Phase-I clinical trials for prostate biopsy and marker seed placement. The system concept, mechanical design, and in-vivo canine studies have been presented earlier [6,10,14]. The software architecture and three-dimensional application software interface discussed in this paper are new additions. This software was tested on pre-recorded patient data. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Magnetic resonance imaging

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Proceedings of the First International conference on Autonomic computing

Proceedings of the First International Conference on Autonom...

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International conference on Autonomic computing (ICAC)

Presents the front cover of the Proceedings of the First conference on visualization in biomedical computing (Cat. No.90TH0311-1).

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