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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711-720 订阅

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Polynomial approximations of gait for human motion analysis and visualization

Polynomial approximations of gait for human motion analysis ...

引用

Annual International conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： C.R. Taylor B.R. von Konsky C. Kirtley School of Computing Curtin University of Technology Perth Australia Department of Rehabilitation Sciences Hong Kong Polytechnic University Hung Hom Hong Kong China

Human motion can be digitally encoded following video motion capture analysis. This process can be computationally intensive or require human intervention when a large number of frames are considered. Data reduction methodologies using cubic interpolation polynomials were investigated. This was done to reduce the number of frames which must be considered by motion analysis software and to reduce bandwidth requirements for collaborative visualization across the Internet. Cubic spline control points were initially selected using the start, left swing, left stance, right swing, right stance, and end position of the gait cycle. An adaptive algorithm is presented to add control points as required to bring the error, calculated as a percentage of joint range, to within a maximum threshold value. It was determined that for subjects with normal gait, six to eight control points were required to generate curves with the appropriate tolerances. Editing polynomial curves by moving control points to visualize the net effect on gait of changes in joint range following surgical procedures are also discussed.

关键词： Polynomials Humans Motion analysis Collaborative software Interpolation Bandwidth Data visualization Internet Spline Adaptive algorithm

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A method for 3-D image representation using a surface model

A method for 3-D image representation using a surface model

引用

Mediterranean Electrotechnical conference (MELECON)

作者： D. Cosic S. Loncaric O. Rajkovic Department of Electronic Systems and Information Processing Faculty of Electrical Engineering and Computing University of Zagreb Croatia

Three-dimensional (3-D) imaging in medicine includes visualization, manipulation and analysis of structural information captured in 3-D (and higher dimensional) digital images. This activity has become an established discipline in medical imaging. A method for surface representation of 3-D images (volumes) is presented. The procedure performs triangulation of the surface of the 3-D object and represents the result using a 3-D scene description language known as the virtual reality modeling language (VRML). The iterative procedure is implemented in C language on a SUN workstation.

关键词： Image representation biomedical imaging visualization Image analysis Information analysis Digital images Layout Virtual reality Sun Workstations

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An automatic threshold-based scaling method for enhancing the usefulness of Tc-HMPAO SPECT in the diagnosis of alzheimer’s disease 1st

引用

1st International conference on Medical Image computing and Computer-Assisted Intervention, MICCAI 1998

作者： Saxena, Pankaj Pavel, Dan G. Quintana, Juan Carlos Horwitz, Barry Biomedical Visualization Laboratory Department of Neurosurgery University of Illinois at Chicago 912 S. Wood Street ChicagoIL60612 United States Nuclear Medicine Department of Radiology University of Illinois Chicago United States Catholic University Santiago Chile Laboratory of Neurosciences National Institute of Aging NIH BethcsdaMD20892 United States

ISBN: (纸本)3540651365

Functional imaging of the brain can aid in the diagnosis of Alzheimer’s disease. Tc-HMPAO SPECT is widely available and relatively inexpensive to use. Combined with computer-based analysis of images, SPECT is a powerful tool in detecting decreases in brain perfusion caused by Alzheimer’s disease. However, analysis can falsely elevate the perfusion of normal areas and diminish the perfusion of atrophic areas in the Alzheimer’s brain when used with conventional scaling methods. In this paper, we present a technique for scaling images that overcomes the problems associated with conventional scaling methods. Our technique was successful in eliminating or attenuating the false increases in perfusion shown in probable Alzheimer’s patients in over 90% of cases (n=17), and in enhancing the sensitivity of detection of degenerative changes by Statistical Parametric Mapping. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Diagnosis

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Visual presentation of magnetic resonance images

Visual presentation of magnetic resonance images

引用

IEEE conference on visualization

作者： J.E. van der Heyden M.S.T. Carpendale K. Inkpen M.S. Atkins School of Computing Science Simon Fraser University Burnaby BC Canada

Medical image analysis is shifting from current film oriented light screen environments to computer environments that involve viewing and analyzing large sets of images on a computer screen. Magnetic resonance imaging (MRI) studies, in particular, can involve many images. The paper examines how best to meet the needs of radiologists in a computational environment. To this end, a field study was conducted to observe radiologists' interactions during MRI analysis in the traditional light screen environment. Key issues uncovered involve control over focus and context, dynamic grouping of images and retrieval of images and image groups. To address the problem of focus and context, existing layout adjustment and magnification techniques are explored to provide the most appropriate solution. Our interest is in combining the methodologies of human computer interaction studies with computational presentation possibilities to design a visual environment for the crucial field of medical image analysis.

关键词： Magnetic resonance Magnetic resonance imaging biomedical imaging Medical diagnostic imaging Image analysis Focusing Magnetic analysis Hospitals Image processing Large screen displays

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A SOM neural network that reveals continuous displacement fields

A SOM neural network that reveals continuous displacement fi...

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International Joint conference on Neural Networks (IJCNN)

作者： G. Labonte Department of Mathematics and Computer Science Royal Military College of Canada Kingston ONT Canada

We present a neural network algorithm, derived from the Kohonen self-organized mapping algorithm, for the solution of the problem of matching points in two pictures representing slightly displaced and distorted images of the same objects. We describe it hereafter in the context of a particular application, namely the matching of the images of marker-particles suspended in a moving fluid, seen in two pictures of them taken a small time interval apart. We illustrate the quality of the solutions it produces with representative results obtained for some test problems; in all cases it is outstandingly efficient.

关键词： Neural networks Mathematics Computer science Military computing Educational institutions Testing Stereo vision Remote sensing biomedical imaging visualization

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Computer aided anatomy with the system Medicus

Computer aided anatomy with the system Medicus

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IEEE EMBS International conference on Information Technology Applications in Biomedicine (ITAB)

作者： K. Antos B. Jezek A. Holmola J. Osterreicher Military Medical Academy Hradec Kralove Czech Republic

Some features of medical education and virtual reality are presented. This topic comprises both conceptual and technical aspects. The connection of progressive technology with classical education methods brings many c... 详细信息

关键词： Anatomy biomedical imaging Virtual reality Data visualization Military computing Space technology Shape Rendering (computer graphics) Computer science education Educational technology

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Shape-based calculation and visualisation of general cross-sections through biological data

Shape-based calculation and visualisation of general cross-s...

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International conference on Information Visualisation (IV)

作者： R. Durikovic T. Yauchi K. Kaneda H. Yamashita EML Faculty of Engineering Hiroshima University Japan

The paper reports a solution to the problem of image interpolation for generating, with high precision, an arbitrary cross-section from a series of slices. Shape-based interpolation as proposed allows the interpolation process to be influenced by the shape of the object. It is accomplished first by creating reconstructed shapes of the objects from a series of slices. Correspondence vectors distributed along the object surface are then generated from the reconstructed shapes. These vectors ensure the correct image interpolation on the boundaries of objects. Next, the correspondence vectors are interpolated to every image point within the new cross-section in process, and the image points at the start and end of a vector are linearly interpolated. Places where the correspondence vectors cannot be (branching or holes in the object shape) are treated separately. Results are presented from biological data obtained using an optical microscope. The data indicate that the proposed method produces more accurate results than commonly used interpolation methods, although at the cost of increased computation.

关键词： visualization Interpolation Shape Image reconstruction Optical microscopy Image generation Surface reconstruction biomedical optical imaging Computational efficiency Biology computing

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Interactive volume rendering for virtual colonoscopy

Interactive volume rendering for virtual colonoscopy

引用

IEEE conference on visualization

作者： Suya You Lichan Hong Ming Wan K. Junyaprasert A. Kaufman S. Muraki Yong Zhou M. Wax Zhengrong Liang Center for Visual Computing and Departments of Computer Science and Radiology State University of New York Stony Brook Stony Brook NY USA State University of New York Albany NY US

3D virtual colonoscopy has recently been proposed as a non-invasive alternative procedure for the visualization of the human colon. Surface rendering is sufficient for implementing such a procedure to obtain an overview of the interior surface of the colon at interactive rendering speeds. Unfortunately, physicians can not use it to explore tissues beneath the surface to differentiate between benign and malignant structures. In this paper, we present a direct volume rendering approach based on perspective ray casting, as a supplement to the surface navigation. To accelerate the rendering speed, surface-assistant techniques are used to adapt the resampling rates by skipping the empty space inside the colon. In addition, a parallel version of the algorithm has been implemented on a shared-memory multiprocessing architecture. Experiments have been conducted on both simulation and patient data sets.

关键词： Virtual colonoscopy Colon Navigation Colonography visualization biomedical optical imaging Computed tomography Computer graphics Solid modeling Rendering (computer graphics)

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TeleInViVo: a novel telemedical application for collaborative volume visualization 96

TeleInViVo: a novel telemedical application for collaborativ...

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Proceedings of the fourth ACM international conference on Multimedia

作者： John D. Coleman Edwin Klement Andrei Savchenko Ammo Goettsch Fraunhofer Center for Research in Computer Graphics 167 Angell St. Providence RI

No abstract available.

ISBN: (纸本)9780897918718

No abstract available.

关键词： 3D ultrasound

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Helical CATSCAN 3-D reconstruction for diagnosis, planning, navigation and therapy of urologic disorders

Helical CATSCAN 3-D reconstruction for diagnosis, planning, ...

引用

Annual Northeast Bioengineering conference

作者： S. Selikowitz S. Pieper R. Harris J. Lenz Department of Engineering UNH Durham NH USA Dartmouth-Hitchcock Medical Center Lebanon NH USA Departments of Surgery Urology and Radiology Veterans Administration Hospital White River Junction VT USA

Summary form only given. New slip ring technology has transformed conventional two dimensional computerized axial tomographic methods into three dimensional imaging. Such methodology has allowed visualization, analysis, orchestration, subtraction and application of volumetric data towards therapeutic ends. It is important that engineers and physicians speak in common denominators for satisfactory end points, considering the rapid developments in imaging and computer technology. This abstract and the accompanying video of 3-D helical CATSCAN reconstruction are oriented to discuss the medical/surgical objectives of such a program. Currently, 3-D imaging is used in skeletal and facial reconstruction, angiography, and endoscopy to communicate complex interrelationships to physicians for planning purposes. Interactive image-guided therapy for minimally invasive surgical procedures demands more than the usual precision and is presently on the horizon. Herein, we present cases that illustrate issues of diagnostic dilemmas regarding planning limits of tumor resection, vascular compromise and navigation of endoscopic instruments within body cavities. Because a human being must obey biologic as well as physical principles, issues of contrast agents, respiratory motion, claustrophobia and interfering disease processes must be considered during imaging sequences.

关键词： Three dimensional displays Image reconstruction Minimally invasive surgery Tomography Data visualization Application software biomedical engineering Physics computing biomedical imaging Medical diagnostic imaging

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