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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751-760 订阅

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INTERACTIVE 3D DOSE VOLUME visualization IN RADIATION-THERAPY

INTERACTIVE 3D DOSE VOLUME VISUALIZATION IN RADIATION-THERAP...

引用

3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： ROOT, G SIMS, C PILLUTLA, R GOLDWASSER, S PICKER INT ST DAVIDSPA 19087

ISBN: (纸本)0819416983

The major aim of conformal therapy is to engulf the tumor volume by a high radiation dose while minimizing the exposure of the surrounding healthy tissue. visualization of the tumor volume, dose, and surrounding tissue is an important step in determining if the proposed treatment plan is optimal or even acceptable. This paper investigates the use of interactive volume visualization for the dose volume as well as the anatomical data. A commercially available volumetric processor capable of computing 10 million transformed and trilinearly interpolated points per second is used to generate multiplanar reformatted (MPR) and 3D displays of patient anatomy and radiation dose. The dose is treated as a volume data set in it's own right, which allows for the arbitrary selection of any isodose surface with interactive control of dose level and relative beam weights for multi beam treatment plans. A coarse-to-fine strategy is employed for all viewing modes. MPR views are generated at the rate of approximately 10 frames per second with 3D displays taking approximately 10 seconds per view. Clinically useful images, indicating the variation of radiation dose levels combined with 3D anatomy, can be generated interactively, allowing for the rapid evaluation of complex treatment plans.

关键词： Tumors 3D displays Tissues visualization 3D image processing Radiotherapy Volume visualization 3D vision Computed tomography Rectum

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L-SYSTEM MODELING OF NEURONS

L-SYSTEM MODELING OF NEURONS

引用

3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： MCCORMICK, BH MULCHANDANI, K TEXAS A&M UNIV DEPT COMP SCISCI VISUALIZAT LABCOLLEGE STNTX 77843

ISBN: (纸本)0819416983

A formal representation of neuron morphology, adequate for the geometric modeling of manually-traced neurons, is presented. The concept of a stochastic L-system is then introduced and the critical distribution functions governing the stochastic generation of dendritic and axonal trees are defined. Experiments with various stochastic L-system models for pyramidal, motoneuron, and Purkinje cells are reported which generate synthetic neurons with promising proximity to neurons in the neurobiology literature. Work is in progress to improve this degree of proximity, but more importantly to validate the derived stochastic models against available databases of manually-traced neurons. To this end a neuron morphology modeler is described which provides a methodology for iterative refinement of the stochastic L-system model.

关键词： Neurons Stochastic processes 3D modeling Data modeling Statistical analysis Databases Tissues visualization Mathematical modeling Visual process modeling

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TRACKING THE INTERFRAME DEFORMATION OF STRUCTURES IN 3D ULTRASOUND IMAGING

TRACKING THE INTERFRAME DEFORMATION OF STRUCTURES IN 3D ULTR...

引用

3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： SYN, M GOSLING, JPM PRAGER, RW BERMAN, L CROWLEY, J UNIV CAMBRIDGE DEPT ENGNCAMBRIDGEENGLAND

ISBN: (纸本)0819416983

Three dimensional ultrasound imaging with a freehand probe allows a flexible approach to medical visualization and diagnosis. Given the imperfect accuracy of proprioceptive devices used to log the position and tilt of the probe, it is important to utilize the position constraints provided by image evidence. This is also important if we wish to consider the visualization of structures which move significantly during acquisition, such as a heart of fetus. We present here an initial approach to more robust segmentation and shape recovery in a particularly noisy modality. We consider 2D segmentation based on edge evidence, using first an active contour, then finding an optimal segmentation using simulated annealing. Correspondence between contours in adjacent frames can only be solved in general cases by use of a 3D prior model. Dynamic physics-based mesh models as used by Pentland [20] and Nastar [17], allow for shape modelling, then over-constrained 3D shape recovery can be performed using the intrinsic vibration modes of the model.

关键词： 3D modeling Image segmentation Ultrasonography 3D image processing Heart visualization Finite element methods Principal component analysis Algorithms Data modeling

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MYOCARDIAL MOTION AND FUNCTION ASSESSMENT USING 4D IMAGES

MYOCARDIAL MOTION AND FUNCTION ASSESSMENT USING 4D IMAGES

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3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： SHI, PC ROBINSON, G DUNCAN, J YALE UNIV DEPT ELECT ENGNNEW HAVENCT 06520

ISBN: (纸本)0819416983

This paper describes efforts aimed at more objectively and accurately quantifying the local, regional and global function of the left ventricle (LV) of the heart from 4D image data. Using our shape-based image analysis methods, point-wise myocardial motion vector fields between successive image frames through the entire cardiac cycle will be computed. Quantitative LV motion, thickening, and strain measurements will then be established from the point correspondence maps. In the paper, we will also briefly describe an in vivo experimental model which uses implanted imaging-opaque markers to validate the results of our image analysis methods. Finally, initial experimental results using image sequences from two different modalities will be presented.

关键词： Motion measurement Motion models Heart Magnetic resonance imaging 3D image processing 3D modeling Motion estimation Image analysis visualization Opacity

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INTERPOLATION BY DIRECTED DISTANCE MORPHING

INTERPOLATION BY DIRECTED DISTANCE MORPHING

引用

3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： BARRETT, W BESS, E BRIGHAM YOUNG UNIV DEPT COMP SCIPROVOUT 84602

ISBN: (纸本)0819416983

Shape-based interpolation (SBI) is used for interpolation between binary serial slice images. Although SBI approximates the interslice geometry more accurately than traditional techniques such as linear (L) or cubic spline (CS) interpolation, SBI produces only a binary result. This paper extends SBI to interpolation of grayscale images (SBIG) using simulated 3D distance maps to produce a grayscale image volume. Results of SBIG are superior visually (sharper detail, no artificial intensities) and quantitatively to L or CS. This is particularly evident in sagittal and coronal reconstructions. Clipping artifacts due to nonoverlapping structures or rapid changes in image brightness are minimized using simulated 3D maps. However, when objects between slices do not overlap, shape-based interpolation results in compressed or nonexistent geometry in some or all of the interpolated slices. The nonoverlapping problem is described and quantified. A new interpolation algorithm, directed distance morphing, is introduced and used to address the nonoverlapping problem.

关键词： 3D image processing Binary data visualization Tissues Computed tomography Skull Image processing Magnetic resonance imaging Medical imaging Volume rendering

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FEATURE DETECTION ON 3-D IMAGES OF DENTAL IMPRINTS

FEATURE DETECTION ON 3-D IMAGES OF DENTAL IMPRINTS

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3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： MOKHTARI, M LAURENDEAU, D UNIV LAVAL FAC SCI & GENIEDEPT GENIE ELECTVIS & SYST NUMER LABQUEBEC CITYPQ G1K 7P4CANADA

ISBN: (纸本)0819416983

A computer vision approach for the extraction of feature points on 3D images of dental imprints is presented. The position of feature points are needed for the measurement of a set of parameters for automatic diagnosis of malocclusion problems in orthodontics. The system for the acquisition of the 3D profile of the imprint, the procedure for the detection of the interstices between teeth, and the approach for the identification of the type of tooth are described, as well as the algorithm for the reconstruction of the surface of each type of tooth. A new approach for the detection of feature points, called the watershed algorithm, is described in detail. The algorithm is a two-stage procedure which tracks the position of local minima at four different scales and produces a final map of the position of the minima. Experimental results of the application of the watershed algorithm on actual 3D images of dental imprints are presented for molars, premolars and canines. The segmentation approach for the analysis of the shape of incisors is also described in detail.

关键词： Teeth 3D image processing Image fusion 3D acquisition Detection and tracking algorithms Sensor fusion computing systems Reconstruction algorithms Image processing 3D metrology

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THE WRAPPER - A SURFACE OPTIMIZATION ALGORITHM THAT PRESERVES HIGHLY CURVED AREAS

THE WRAPPER - A SURFACE OPTIMIZATION ALGORITHM THAT PRESERVE...

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3rd conference on visualization in biomedical computing 1994 (VBC 94)

作者： GUEZIEC, A DEAN, D NYU MED CTR INST RECONSTRUCT PLAST SURGNEW YORKNY 10016

ISBN: (纸本)0819416983

Software to construct polygonal models of anatomical structures embedded as isosurfaces in 3D medical images has been available since the mid 1970s. Such models are used for visualization, simulation, measurements (single and multi-modality image registration), and statistics. When working with standard MR- or CT-scans, the surface obtained can contain several million triangles. These models contain data an order of magnitude larger than that which can be efficiently handled by current workstations or transmitted through networks. These algorithms generally ignore efficient combinations that would produce fewer, well shaped triangles. An efficient algorithm must not create a larger data structure than present in the raw data. Recently, much research has been done on the simplification and optimization of surfaces ([Moore and Warren, 1991]); [Schroeder et al., 1992]; [Turk, 1992]; [Hoppe et al., 1993]; [Kalvin and Taylor, 1994]). All of these algorithms satisfy two criteria, consistency and accuracy, to some degree. Consistent simplification occurs via predictable patterns. Accuracy is measured in terms of fidelity to the original surface, and is a prerequisite for collecting reliable measurements from the simplified surface. We describe the 'Wrapper' algorithm that simplifies triangulated surfaces while preserving the same topological characteristics. We employ the same simplification operation in all cases. However, simplification is restricted but not forbidden in high curvature areas. This hierarchy of operations results in homogeneous triangle aspect and size. Images undergoing compression ratios between 10 and 20:1 are visually identical to full resolution images. More importantly, the metric accuracy of the simplified surfaces appears to be unimpaired. Measurements based upon 'ridge curves; (sensu [Cutting et al., 1993]) extracted on polygonal models were recently introduced [Ayache et al., 1993]. We compared ridge curves digitized from full resolution, Wrappe

关键词： 3D modeling Data modeling Image compression Image resolution Surgery visualization Computed tomography Natural surfaces 3D metrology Optimization (mathematics)

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On a prototype for a new distributed data base of volume data obtained by 3D imaging

On a prototype for a new distributed data base of volume dat...

引用

visualization in biomedical computing 1994

作者： Marabini, R. Vaquerizo, C. Fernandez, J.J. Carazo, J.M. Ladjadj, M. Odesanya, O. Frank, J. Centro Nacional de Biotecnologia-CSIC Univ. Autronoma Madrid28049 Spain Department of Computer Architecture Univ. of Malaga Spain Wadsworth Center for Laboratories and Research Empire State Plaza Albany New YorkNY12201-0509 United States Department of Biomedical Sciences State University of New York Albany United States

In this communication we present a working prototype of a distributed data base of volume data from different forms of 3D imaging. Examples of three-dimensional information both from electron tomography of biological macromolecules and from medical imaging are already included in this development. This type of structural information is crosslinked, whenever applicable, to other sources of information, such as bibliographies. The solution we present here is sufficiently general to be applicable to data in a number of different fields of biomedical science. © 1994 SPIE. All rights reserved.

关键词： Medical imaging

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A computational steering model applied to problems in medicine 94

A computational steering model applied to problems in medici...

引用

Supercomputing conference

作者： C.R. Johnson S.G. Parker Department of Computer Science University of Utah Salt Lake UT USA

ISBN: (纸本)9780818666056

We describe a computational steering model which allows users to interactively change boundary conditions, model geometry, and computational parameters via a graphical user interface. To replace the typical simulation mode-in which the researcher manually sets input parameters, computes results, stores data off to disk, visualizes the results via a separate visualization package, then starts again at the beginning-we have designed software to "close the loop" and allow the visualization to help guide (steer) the design and computation phases of the simulation. We have applied the computational steering model to problems in medicine, specifically to applications in bioelectric field phenomena and biomedical device design.< >

关键词： Computational modeling Data visualization Computer interfaces Solid modeling Medical simulation biomedical computing Boundary conditions Computational geometry Graphical user interfaces Software packages

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Isosurface generation by using extrema graphs 94

Isosurface generation by using extrema graphs

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IEEE conference on visualization

作者： T. Itoh K. Koyamada Tokyo Research Laboratory IBM Japan

ISBN: (纸本)9780780325210

A high-performance algorithm for generating isosurfaces is presented. In this algorithm, extrema points in a scalar field are first extracted. A graph is then generated in which the extrema points are taken as nodes. Each arc of the graph has a list of IDs of the cells that are intersected by the arc. A boundary cell list ordered according to cells' values is also generated. The graph and the list generated in this pre-process are used as a guide in searching for seed cells. Isosurfaces are generated from seed cells that are found in arcs of the graph. In this process, isosurfaces appear to propagate themselves. The algorithm visits only cells that are intersected by an isosurface and cells whose IDs an included in cell lists. It is especially efficient when many isosurfaces are interactively generated in a huge volume. Some benchmark tests described show the efficiency of the algorithm.< >

关键词： Isosurfaces Costs Intrusion detection Data visualization Laboratories Benchmark testing Numerical simulation Power engineering computing biomedical engineering Power engineering and energy

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