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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851-860 订阅

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Integrated displays of multiparameter and multimodality images

Integrated displays of multiparameter and multimodality imag...

引用

conference on visualization in biomedical computing

作者： R.M. Pickett H. Levkowitz Graphics Res. Lab. Lowell Univ. MA USA

Two specific approaches to integrated displays of multiparameter and multimodality tomographic images are proposed and illustrated. Such integration enables the radiologist to see the combined information that these displays only crudely afford when viewed individually. With color coding, the gray-scale values of the pixels in the separate images control the color values of corresponding pixels in a single color picture. With geometric coding, the gray-scale values from the separate images control the geometry of a graphic icon at corresponding locations in the combined image. These techniques are applies to create integrated displays of two-parameter magnetic resonance images of two medical cases.< >

关键词： Displays Pixel Graphics Tomography Image analysis Gray-scale biomedical imaging Medical diagnostic imaging Image coding Geometry

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ANALYZE: a software system for biomedical image analysis

ANALYZE: a software system for biomedical image analysis

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conference on visualization in biomedical computing

作者： R.A. Robb D.P. Hanson Mayo Foundation Rochester MN USA

A comprehensive software package, called ANALYZE, which permits detailed investigation and evaluation of 3D and 4D biomedical images is described. This software can be used with any 3D imaging modality, including X-ray computed tomography, radionuclide emission tomography, ultrasound tomography, magnetic resonance imaging, and both light and electron microscopy. The package is powerful in its synergistic integration of fully interactive modules for direct display, manipulation, and measurement of multidimensional image data. Several original algorithms that improve image display efficiency and quality are included. One of these is a versatile and powerful volume rendering algorithm. The inclusion of a variety of editing, quantitative mensuration, and macro design tools significantly extends the usefulness of the software. ANALYZE runs on standard Unix computers without special-purpose hardware.< >

关键词： Image analysis Software systems biomedical imaging Magnetic analysis Ultrasonic imaging Magnetic resonance imaging X-ray imaging Tomography Software packages Optical imaging

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Medical image analysis using model-based optimization

Medical image analysis using model-based optimization

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conference on visualization in biomedical computing

作者： J.S. Duncan L.H. Staib T. Birkholzer R. Owen P. Anandan I. Bozma Department of Electrical Engineering Yale University New Heaven CT USA Computer Science Yale University New Heaven CT USA

The use of mathematical models and optimization theory is suggested as a unifying approach to solving certain automated segmentation and analysis problems in medical imaging. Within this framework, the authors present three examples. Being able to view segmented objects and/or quantitative descriptions of an object's shape, size, and movement properties is felt to be an improved form of visualizing the anatomy for purposes of diagnosis. The first two examples are related to extracting features and ultimately segmenting outlines of objects, useful for many 2D anatomical object recognition problems. The third example is an analysis method that is specific to the problem of tracking motion of the wall of the left ventricle of the heart.< >

关键词： biomedical imaging Image analysis Image segmentation Medical diagnostic imaging Image motion analysis Mathematical model Shape visualization Anatomy Feature extraction

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Imaging of blood flow by NMR using phase velocity mapping

Imaging of blood flow by NMR using phase velocity mapping

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conference on visualization in biomedical computing

作者： C. Vesier E. Poiseau R. Minsk A. Yoganathan G. Cranney R. Singleton School of Chemical Engineering Georgia Technology Research Institute Atlanta GA USA Cardiovascular NMR Laboratory University of Alabama Birmingham AL USA

Preliminary results concerning the feasibility of using nuclear magnetic resonance (NMR) imaging techniques to visualize 3-D time-dependent flow fields are presented. The possibility of clinical application of this technique is evaluated by measuring steady flow in straight circular tubes, converging sections, and downstream of prosthetic aortic valves, as well as pulsatile flow in circular tubes. Measurements by NMR are compared with previously published results and theoretical data using different visualization techniques. The strategies and techniques used to display the flow images optimally are presented. Preliminary results on the accuracy of flow images obtained from NMR data are presented.< >

关键词： Blood flow Nuclear magnetic resonance Magnetic resonance imaging Magnetic field measurement Fluid flow measurement Image converters Prosthetics Valves Data visualization Displays

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visualization of cardiovascular nuclear medicine tomographic perfusion studies

Visualization of cardiovascular nuclear medicine tomographic...

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conference on visualization in biomedical computing

作者： C.D. Cooke E.V. Garcia R.D. Folks J.W. Peifer N.F. Ezquerra Division of Nuclear Medicine Emory University Hospital Atlanta GA USA Office of Interdisciplinary Georgia Institute of Technology Atlanta GA USA

Several methodologies and tools for enhancing the clinician's ability to visualize and characterize perfusion defects are presented. The tools include an improved method for sampling the myocardium which reduces the partial volume effects often encountered when sampling the apex, volume-weighted and distance-weighted polar maps that enhance the information extracted from the new sampling technique, a method for visualizing perfusion information in three dimensions which decreases the distortions inherent in 2-D polar maps and also allows for unifying the perfusion information with the anatomic information obtained from 3-D coronary trees, and a method for visualizing 3-D gated perfusion information that allows a clinician to assess both perfusion and wall thickening.< >

关键词： Cardiology Nuclear medicine Tomography Myocardium Data visualization Imaging phantoms Sampling methods Hospitals Two dimensional displays Geometry

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Interactive morphometrics from three-dimensional surface images

Interactive morphometrics from three-dimensional surface ima...

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conference on visualization in biomedical computing

作者： S.C. Becker W.A. Barrett Department of Computer Sciences Brigham Young University USA

Techniques for extracting three-dimensional (3D) measurements directly and interactively from 3D representations of surface anatomy are discussed. In order to obtain 3D measurements the anatomical surface is interrogated directly through the use of morphometric tools. Morphometric tools include points, 3D graphical probes, and logical sectioning functions which interact with the surface through depth buffer compositing operations. Tools are interactively positioned on or through the surface to measure surface dimensions and partial volumes, or to define intersecting functions which allow surface anatomy to be visualized in the context of surrounding anatomy. visualization is also enhanced because tools reveal much pertaining to surface morphology while providing valuable depth cuing for visual feedback and probe placement. Since tools are implemented using a general depth buffer, the techniques are applicable to a variety of 3D imaging algorithms.< >

关键词： Surface morphology Rendering (computer graphics) Extraterrestrial measurements Anatomy Data visualization Surface treatment Probes Volume measurement biomedical imaging Detectors

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Computer aided surgery system (CAS): Development of surgical simulation and planning system with three dimensional graphic reconstruction

Computer aided surgery system (CAS): Development of surgical...

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conference on visualization in biomedical computing

作者： T. Dohi Y. Ohta M. Suzuki K. Chinzei T. Horiuchi D. Hashimoto M. Tsuzuki Faculty of of Engineering University of Tokyo Tokyo Japan Tokyo Metropolitan Police Hospital Tokyo Japan Faculty of Medicine University of Tokyo Tokyo Japan

To assess the feasibility of computer-aided surgery (CAS) with three-dimensional (3D) graphic reconstruction, the authors describe an experiment in which direct needle punctures were made into porcine liver phantoms on the basis of a collision assessment. A 90% success rate was achieved when a generalized cylinder method for vessel reconstruction was used. A clinical trial of this system for surgical planning shows its potential for use in abdominal surgery.< >

关键词： Content addressable storage Computational modeling Computer simulation Image reconstruction Graphics Liver biomedical imaging Laser surgery Needles X-ray imaging

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Contrast-limited adaptive histogram equalization: speed and effectiveness

Contrast-limited adaptive histogram equalization: speed and ...

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conference on visualization in biomedical computing

作者： S.M. Pizer R.E. Johnston J.P. Ericksen B.C. Yankaskas K.E. Muller Medical Image Display Research Group North Carolina State University Chapel Hill NC USA

An experiment intended to evaluate the clinical application of contrast-limited adaptive histogram equalization (CLAHE) to chest computer tomography (CT) images is reported. A machine especially designed to compute CLAHE in a few seconds is discussed. It is shown that CLAHE can be computed in 4 s after 5-s loading time using the specially designed parallel engine made from a few thousand dollars worth of off-the-shelf components. The processing appears to be useful for a wide range of medical images, but the limitations of observer calibration make it impossible to demonstrate such usefulness by agreement experiments.< >

关键词： Histograms Adaptive equalizers biomedical imaging Computed tomography Displays Lesions Lungs Clinical diagnosis Design methodology Medical diagnostic imaging

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visualization in the neurosciences: Addressing problems in research, teaching and clinical practice

Visualization in the neurosciences: Addressing problems in r...

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conference on visualization in biomedical computing

作者： S.A. Barney J.M. Nyce M.J. Ackerman W.X. Graves J.C. King E.T. Koh J.W. Sundsten Department of Anatomy and Cellular Biology Tufts University School of Medicine Boston MA USA Brown University USA National Library of Medicine USA Bryant College Tufts University School of Medicine USA University of Washington School of Medicine

The use of visualization in five neuroscience projects is discussed. The issue of how structural models can be best manipulated to gain insight into nervous system function is addressed. visualization projects that take up this issue from three different user perspectives (research, student, and clinician) are described. The first two projects, focus on the molecular level, particularly mechanisms of process and control within neuronal systems. The next two relate functional subsystems to gross morphology and neuroanatomical pathways in educational applications. The final project describes a long-term effort underway to develop a national resource of images related by function. These projects, when taken together, exemplify current trends and approaches in this area. Several technical and conceptual issues that extend beyond these projects are also discussed. These include delivery platforms, integration paths, the development of standards for image acquisition and representation, and use in routine medical practice.< >

关键词： Education biomedical imaging Humans Brain Microscopy Data visualization Neuroscience Image reconstruction Cells (biology) Biochemistry

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Kinematics of joints of the foot via three-dimensional;magnetic resonance images

Kinematics of joints of the foot via three-dimensional;magne...

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conference on visualization in biomedical computing

作者： B.E. Hirsch J.K. Udupa R.J. Goncalves D. Roberts Department of Anatomy Pennsylvania College of Podiatric Medicine Philadelphia PA USA Medical Image Processing Group Department of Radiology University of Pennsylvania Philadelphia PA USA School of Dental Medicine University of Pennsylvania Philadelphia PA USA

A system which is being developed to carry out a kinematic analysis of joints and to provide data on joint motions is described. It is based on the registration of two three-dimensional reconstructions of the component bones of a joint from magnetic resonance scan data. The result of the registration is the movement necessary to transform one joint instance into another. The authors conclude that it is possible to create an accurate three-dimensional reconstruction of bones from magnetic resonance images, although it requires interactive segmentation of the bone by a knowledgeable operator.< >

关键词： Kinematics Foot Magnetic resonance Joints Motion analysis Bones Surface morphology biomedical imaging Independent component analysis Magnetic analysis

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