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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841-850 订阅

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Display of EEG chaotic dynamics

Display of EEG chaotic dynamics

引用

conference on visualization in biomedical computing

作者： J.C. Principe F.S. Yu S.A. Reid Electrical Engineering Department University of Florida Gainesville FL USA Department of Neurosurgery University of Florida Gainesville FL USA

A method for the visualization of the electroencephalogram (EEG) in phase space is described. The signal is transformed from the time domain to phase space by measuring the correlation dimension of the data and constructing the attractor in the required embedding space, which is normally of dimension 3 to 8. A singular value decomposition is used to obtain a good projection to 3-D. Animation of a series of 2-D rotated projections provides a way to visualize the fine structure of the reconstructed 3-D attractor. Examples and a computer package are briefly described.< >

关键词： Displays Electroencephalography Chaos Nonlinear dynamical systems Data visualization Humans Brain mapping Neurosurgery Phase measurement Time measurement

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The effect of receiving chamber environment on the visualization of cardiac jets by color Doppler flow mapping

The effect of receiving chamber environment on the visualiza...

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conference on visualization in biomedical computing

作者： E.G. Cape R. Monheit H.-W. Sung S.H. Winoto A.E. Weyman R.A. Levine A.P. Yoganathan School of Chemical Engineering Georgia Technology Research Institute Atlanta GA USA Cardiac Ultrasound Laboratory Massachusetts General Hospital Boston MA USA

Jet spatial resolution as visualized by color Doppler flow mapping has previously been shown to be affected by physical factors, such as driving pressure, and technical factors, such as instrument settings. An additional factor producing superimposed variability, namely, the interaction of the jet with solid boundaries, in the distal receiving chamber, is illustrated. The broader point that jet velocities (i.e., Doppler images) do not uniquely represent jet volume is demonstrated.< >

关键词： visualization Ultrasonic imaging Frequency Cells (biology) Valves Heart Solids Blood flow Instruments Velocity measurement

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Three-dimensional visualization of the liver from computed-tomography data

Three-dimensional visualization of the liver from computed-t...

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conference on visualization in biomedical computing

作者： C.E. Kahn K. Bae M.L. Giger C.-T. Chen Department of Radiology University of Chicago Chicago IL USA Dept. of Radiol. Chicago Univ. IL USA

A method for 3D surface mapping from computer tomography (CT) images of the abdomen is described. The liver can be visualized in 3D from any perspective and can be shown either alone or through the translucent abdominal wall. Artificial-intelligence techniques are used to identify salient anatomic features from which the lobar and segmental anatomy can be determined. These methods are applied to abdominal CTs of potential donors of segmental liver transplants, in which preoperative volumetry and visualization of the left lateral segment are of significant value.< >

关键词： Data visualization Liver Computed tomography Abdomen Image segmentation Surface morphology Computer displays Sun Rendering (computer graphics) Radiology

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Nucleotide sequence analysis using correlation images

Nucleotide sequence analysis using correlation images

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conference on visualization in biomedical computing

作者： M.O. Ward D.S. Adams Computer Science Department Worcester Polytechnic Institute Worcester MA USA Biology /Biotechnology Department Worcester Polytechnic Institute Worcester MA USA

An application area for computer visualization, namely, nucleotide sequence analysis, and a visualization technique, termed a correlation image (CI), are presented. A CI is produced by comparing two sequences in all possible alignments, with each image row corresponding to a distinct alignment. Information of interest to molecular biologists (e.g., inverted and direct repeats, insertions, deletions, homology divergence) are clearly manifested as highly distinct geometric patterns in the image. A typical CI may represent several megabytes of information, yet the display can easily be created and scanned in seconds. The derivation and interpretation of CIs are shown. They are compared with other nucleotide sequence analysis techniques. The power of CIs in uncovering homologies is illustrated.< >

关键词： Image analysis Image sequence analysis Sequences DNA Databases Biology computing Performance analysis Humans Biological information theory Genetics

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biomedical image segmentation using multiscale orientation fields

Biomedical image segmentation using multiscale orientation f...

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conference on visualization in biomedical computing

作者： K.-C. Low J.M. Coggins Computer Science Department University of North Carolina Chapel Hill USA Center of Excellence in Space Data and Information Science NASA Goddard Space Flight Center USA

An algorithm for labeling image regions based on pixel-level statistical pattern recognition is presented. The structure of multiscale regions about each pixel is measured by means of isotropic Gaussian filters and by a multiscale orientation field. A redundant feature space representing several aspects of image structure across scale, orientation, and space is created. The segmentation algorithm decides membership of pixels in regions by means of simple statistical pattern recognition methods, such as distance measurement and thresholding. Feature vectors are examined locally to determine region membership; the features incorporate multiscale image structure information. Results of multiscale image segmentations on biomedical images are presented.< >

关键词： biomedical imaging Image segmentation Labeling Humans Pattern recognition Computer displays Pixel Filters Information science NASA

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Surface shading in tomographic volume visualization: a comparative study

Surface shading in tomographic volume visualization: a compa...

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conference on visualization in biomedical computing

作者： A. Pommert U. Tiede G. Wiebecke K.H. Hohne Institute of Mathematics and Computer Science in Medicine (IMDM) University Hospital Eppendorf Hamburg Germany

The quality of different shading algorithms for use in tomographic volume visualization (z-buffer gradient, gray-level gradient, adaptive gray-level gradient, marching cubes, marching cubes segmentation with Phong interpolation, transparent gray-level gradient), using simulated and clinical data, is investigated. Error images are used to visualize deviations of the calculated surface normal vectors from the ideal values. For the assessment of transparent rendering, reflection maps are used. The best results are obtained with adaptive gray-level gradient shading and marching cubes segmentation with Phong interpolation. The first method is based on the voxel model and thus is especially suitable for interactive data exploration. The second creates a polygon structure, which may be manipulated with methods developed in computer graphics. Transparent gray-level gradient shading should only be used if no binary segmentation can be done.< >

关键词： Data visualization Image segmentation Interpolation Rendering (computer graphics) Lighting biomedical imaging X-ray imaging Computed tomography Magnetic resonance imaging Mathematics

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An efficient ray tracing algorithm for modeling visual performance from corneal topography

An efficient ray tracing algorithm for modeling visual perfo...

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conference on visualization in biomedical computing

作者： J.J. Camp L.J. Maguire R.A. Robb Physiology and Biophysics Mayo Foundation Rochester MN USA Ophthalmology Mayo Foundation Rochester MN USA

The authors describe two ray-tracing algorithms for deriving an optical point-spread function (PSF) from corneal topography measurements: one a simple adaptation of the lensmaker's equations, the other a classical geometric refraction. The relative efficiency of the two algorithms is objectively evaluated in terms of actual computer time. The overall difference in the resulting PSFs is characterized by means several statistical measures, and subjective evidence of the accuracy of modeling visual effects is presented.< >

关键词： Ray tracing Optical refraction Surface topography Cornea Optical signal processing biomedical optical imaging Signal processing algorithms Surgery Layout Physiology

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3-D representation from time-sequenced biomedical images using 2-D cepstrum

3-D representation from time-sequenced biomedical images usi...

引用

conference on visualization in biomedical computing

作者： S. Mitra D.J. Lee T.F. Krile Department of Electrical Engineering Texas Tech University Lubbock TX USA

A cepstrum technique that not only is capable of precise registration of fundus images but also leads to three-dimensional reconstruction of fundus structures with a motion stereo model is presented. The use of cepstrum techniques allows the representation of the three-dimensional features in a quantitative manner that is impossible to obtain from just a stereoscopic view. A geometrical transformation using a set of polynomial functions is introduced. The definition of the two-dimensional power cepstrum and the analytical procedure for obtaining the disparity are shown in detail. A modified time-sequenced stereo model using a matching technique, i.e., the two-dimensional cepstrum, is introduced.< >

关键词： biomedical imaging Cepstrum Stereo vision Polynomials Diseases Retina Diabetes Retinopathy Image reconstruction Cameras

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Computer-generator color animations of acoustic transduction in the auditory periphery

Computer-generator color animations of acoustic transduction...

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conference on visualization in biomedical computing

作者： S. Greenberg D. Rose J. Brugge C.D. Geisler J.E. Hind Department of Neurophysiology University of Wisconsin Madison WI USA Department of Electrical & Computer Engineering University of Wisconsin Madison WI USA

A series of computer-generated two-dimensional color animations depicting basic concepts of acoustic transduction in the middle and inner ears for a medical school course on hearing mechanisms are presented. Topics and concepts covered in the animations include motion of the tympanic membrane and ossicular chain, the traveling-wave pattern of basilar membrane motion, cochlear micromechanics, inner hair cell depolarization, tonotopic organization and the place principle of frequency coding and temporal coding of frequency. A SuperCard application controls the animations and provides access to additional material pertaining to the auditory periphery, such as illustrations, photographs, text and interactive quizzes. These materials are packaged in two versions, one for classroom presentation, the other for use as a study aid.< >

关键词： Animation Auditory system Biomembranes Frequency Optical computing Ear Educational institutions Neurophysiology biomedical optical imaging biomedical acoustics

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Three dimensional imaging of computed tomography: Techniques and applications

Three dimensional imaging of computed tomography: Techniques...

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conference on visualization in biomedical computing

作者： D. Ney E.K. Fishman D. Magid Department of Radiology Johns Hopkins Medical Institutions Baltimore MD USA

The volumetric rendering technique, a method for creating 3D images of medical volume data sets, and its application to clinical medicine are discussed. Several features of this technique alleviate problems found in using other image generation techniques. It allows for the use of a mixture paradigm for representation of the volume to be rendered. It uses mathematical techniques which reduce or eliminate aliasing (a significant source of computer-generated artifacts). The volumetric rendering of computer tomography data can be broken into four steps: volume formation, classification, rotation, and projection.< >

关键词： Computed tomography Rendering (computer graphics) Magnetic resonance imaging Medical treatment biomedical imaging Medical diagnostic imaging Bones Hardware Image generation Radiology

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