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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601-610 订阅

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Micro-CT images reconstruction and 3-D visualization for small-animal studying

Micro-CT images reconstruction and 3-D visualization for sma...

引用

conference on Optics in Health Care and biomedical Optics

作者： Gong, H Liu, Q Zhong, A Ju, S Fang, Q Fang, Z Huazhong Univ Sci & Technol Key Lab Biomed Photon Minist Educ Wuhan 430074 Peoples R China

ISBN: (纸本)0819455857

A small-animal x-ray micro computed tomography (micro-CT) system has been constructed to screen laboratory small animals and organs. The micro-CT system consists of dual fiber-optic taper-coupled CCD detectors with a field-of-view of 25 x 50 mm(2), a microfocus x-ray source, a rotational subject holder. For accurate localization of rotation center, coincidence between the axis of rotation and centre of image was studied by calibration with a polymethylmethacrylate cylinder. Feldkamp's filtered back-projection cone-beam algorithm is adopted for three-dimensional reconstruction on account of the effective corn-beam angle is 5.67(0) of the micro-CT system. 200 x 1024 x 1024 matrix data of micro-CT is obtained with the magnification of 1.77 and pixel size of 3 1 X 31 mum(2) M. In our reconstruction software, output image size of micro-CT slices data, magnification factor and rotation sample degree can be modified in the condition of different computational efficiency and reconstruction region. The reconstructed image matrix data is processed and visualization by visualization Toolkit (VTK). Data parallelism of VTK is performed in surface rendering of reconstructed data in order to improve computing speed. computing time of processing a 512 x 512 x 512 matrix datasets is about 1/20 compared with serial program when 30 CPU is used. The voxel size is 54x54x108 mum(3). The reconstruction and 3-D visualization images of laboratory rat car are presented.

关键词： micro-CT CCD detector x-ray small-animal imaging

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3-D visualization system of the cranium based on x-ray images

3-D visualization system of the cranium based on x-ray image...

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3rd International conference on Medical Information Visualisation - biomedical Visualisation, MediVis 2005

作者： Pan, Jun-Jun Zhang, Yan-Ning Zhou, Hong Feng, David Dagan School of Computer Science Northwestern Poly-technical University Xi'an China Stomatology Hospital of Xi'an Jiao Tong University Xi'an China Multimedia Computing Research Laboratory Sydney University Australia

ISBN: (纸本)0769523935

A 3-d visualization system of the cranium based on reconstruction from X-rays is presented. Since X-rays belong to the penetrating projection images, the objects do not have definite surface in images. To solve this problem, an approach of pasting the lead granules on the face of a patient and reconstructing the face through the correlated vision is adopted. Then the 3-d cranium model is built by subtracting the thickness of soft tissue from the face model. The whole system consists of image pre-processing, feature point recognition, matching, texture mapping, animation, and 3-d measurement. Only the X-ray machine, adhesive tapes with lead granules and Multrasonograph are needed. The experiment demonstrates that this approach is effective and of high precision. It can help doctors examine and measure the face and cranium of patients by computer. Hopefully, this product could be developed and applied in clinic one day.

关键词： Medical imaging

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3rd Annual conference of the Healthgrid Association, Healthgrid 2005

3rd Annual Conference of the Healthgrid Association, Healthg...

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3rd Annual conference of the Healthgrid Association, Healthgrid 2005

ISBN: (纸本)158603510X

The proceedings contain 23 papers. The topics discussed include: managing healthcare information: the role of the broker;grid-based onto-technologies provide an effective instrument for biomedical research;ontology–based knowledge repository support for healthgrids;deployment of a grid-based medical imaging application;developing a distributed collaborative radiological visualization application;grid-enabled biosensor networks for pervasive healthcare;biomedical informatics research network: building a national Collaboratory to hasten the derivation of new understanding and treatment of disease;a grid architecture for medical applications;parametric optimization of a model-based segmentation algorithm for cardiac MR image analysis: a grid-computing approach;and ARTEMIS: towards a secure interoperability infrastructure for healthcare information systems.

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Web-based hybrid visualization of medical images

Web-based hybrid visualization of medical images

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4th International conference on Image and Video Retrieval, CIVR 2005

作者： Yoo, Sun K. Key, Jaehong Choi, Kuiwon Jo, Jinho Dept. of Medical Engineering College of Medicine Yonsei University Seoul Korea Republic of Graduate Program in Biomedical Engineering Yonsei University Seoul Korea Republic of Biomedical Research Center Korea Institute of Science and Technology Seoul Korea Republic of

The purpose of this paper is to visualize a still image and video on 3-dimensional medical image on the web using volume rendering board and VRML(Virtual Reality Modeling Language). Using VRML, the compressed 3-dimensional still image was represented effectively on the web through polygon reduction. The real time 3-dimensional volume rendering was compressed by Window Media Video 9 codec for implementation on the web. This paper focuses on detecting the most optimized 3-dimensional medical image on different bandwidths. Performance test has been carried out by evaluating the 3-dimensional medical image using various encoding bit rates on several network conditions. The network conditions were ADSL(Asymmetric Digital Subscriber Line), VDSL(Very high-data rate Digital Subscriber Line), LAN(Local Area Network), and Wireless LAN, which are common in South Korea. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Medical imaging

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A collaborative extension of a visualization system

A collaborative extension of a visualization system

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International conference on (DFMA) Distributed Frameworks for Multimedia Applications

作者： S. Casera H.-H. Nageli P. Kropf Computer Science Department University of Neuchâtel Switzerland

This paper presents an extension of the single-user scientific visualization system ZoomIn to a collaborative system. We discuss the principal challenges of remote collaboration in the case of scientific visualization and present the solutions realized for ZoomIn. The main issues identified include the support of slow/fast network connections, portability, ease-of-use, privacy, configuration of the working mode and permissions. We describe why the main concepts of the original ZoomIn are well suited for a collaborative extension and how collaboration is introduced. In particular, the volume of data for scientific visualization may be very large. Therefore, the transfer of data has to be optimized. We present three different methods of data transfer for collaborative visualization and compare their efficiency with respect to particular application scenarios.

关键词： Collaboration Data visualization Collaborative work Collaborative software biomedical computing Application software Computer networks Peer to peer computing Grid computing Computer science

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Visualisation within a multisensorial surgical planner

Visualisation within a multisensorial surgical planner

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International conference on Computer Graphics, Imaging and visualization, CGIV

作者： G.J. Clapworthy M. Krokos R. Mayoral R. Liang D. Podgorelec Department of Computing & Information Systems University of Luton UK

This paper describes the visualisation components associated with a new environment for the pre-operative planning of total hip replacement. The system has a multisensorial immersive interface (stereoscopic display, several six-degrees-of-freedom tracking technologies, speech recognition and control, and haptic feedback) and includes advanced software visualisation and evaluation modules for both planning the operation and evaluating the likely outcomes.

关键词： visualization Orthopedic surgery Surges Hip Virtual reality Haptic interfaces Medical services biomedical equipment Thigh Prosthetics

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Scalable parallel octree meshing for terascale applications 05

Scalable parallel octree meshing for terascale applications

引用

ACM/IEEE 2005 Supercomputing conference, SC'05

作者： Tu, Tiankai O'Hallaron, David R. Ghattas, Omar Computer Science Department Carnegie Mellon University Pittsburgh PA 15213 United States Department of Electrical and Computer Engineering Carnegie Mellon University PA 15213 United States Institute for Computational Engineering and Sciences Dept. of Geol. Sciences Mechanical Engineering Computer Science and Biomedical Engineering University of Texas Austin TX 78712 United States

ISBN: (纸本)1595930612

We present a new methodology for generating and adapting octree meshes for terascale applications. Our approach combines existing methods, such as parallel octree decomposition and space-filling curves, with a set of new methods that address the special needs of parallel octree meshing. We have implemented these techniques in a parallel meshing tool called Octor. Performance evaluations on up to 2000 processors show that Octor has good isogranular scalability, fixed-size scalability, and absolute running time. Octor also provides a novel data access interface to parallel PDE solvers and parallel visualization pipelines, making it possible to develop tightly coupled end-to-end finite element simulations on terascale systems. © 2005 IEEE.

关键词： Parallel processing systems

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3-d visualization system of the cranium based on X-ray images

3-d visualization system of the cranium based on X-ray image...

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International conference on Medical Information Visualisation - biomedical Visualisation (MediVis)

作者： Pan Jun-jun Zhang Yan-ning Zhou hong D.D. Feng School of Computer Science Northwestern Polytechnical University Xi'an China Stomatology Hospital Xi''an Jiaotong University Xi'an China Multimedia Computing Research Laboratory University of Sydney Australia

A 3-d visualization system of the cranium based on reconstruction from X-rays is presented. Since X-rays belong to the penetrating projection images, the objects do not have definite surface in images. To solve this problem, an approach of pasting the lead granules on the face of a patient and reconstructing the face through the correlated vision is adopted. Then the 3-d cranium model is built by subtracting the thickness of soft tissue from the face model. The whole system consists of image pre-processing, feature point recognition, matching, texture mapping, animation, and 3-d measurement. Only the X-ray machine, adhesive tapes with lead granules and M-ultrasonograph are needed. The experiment demonstrates that this approach s effective and of high precision. It can help doctors examine and measure the face and cranium of patients by computer. Hopefully, this product could he developed and applied in clinic one day.

关键词： visualization Cranium X-ray imaging Image reconstruction Face detection Facial animation biomedical imaging Medical diagnostic imaging Surface reconstruction Biological tissues

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Full-field OCT: applications in ophthalmology

Full-field OCT: applications in ophthalmology

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15th conference on Ophthalmic Technologies

作者： Grieve, K Dubois, A Paques, M Le Gargasson, JF Boccara, AC Ecole Super Phys & Chim Ind Ville Paris CNRS UPR A0005 Lab Opt Phys F-75231 Paris France

ISBN: (纸本)0819456624

We present images of ocular tissues obtained using ultrahigh resolution full-field OCT. The experimental setup is based on the Linnik interferometer, illuminated by a tungsten halogen lamp. En face tomographic images are obtained in real-time without scanning by computing the difference of two phase-opposed interferometric images recorded by a high-resolution CCD camera. A spatial resolution of 0.7 mu m 0.9 mu m (axial x transverse) is achieved thanks to the short source coherence length and the use of high numerical aperture microscope objectives. A detection sensitivity of 90 dB is obtained by means of image averaging and pixel binning. Whole unfixed eyes and unstained tissue samples (cornea, lens. retina, choroid and sclera) of ex vivo rat, mouse. rabbit and porcine ocular tissues were examined. The unprecedented resolution of our instrument allows cellular-level resolution in the cornea and retina, and visualization of individual fibers in the lens. Transcorneal lens imaging was possible in all animals. and in albino animals, transscleral retinal imaging was achieved. We also introduce our rapid acquisition full-field optical coherence tomography system designed to accommodate in vivo ophthalmologic imaging. The variations on the original system technology include the introduction of a xenon arc lamp as source, and rapid image acquisition performed by a high-speed CMOS camera. reducing acquisition time to 5 ins per frame.

关键词： interference microscopy optical coherence tomography medical and biomedical imaging

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Parallel and distributed processing of visual content: traditional view and new directions

Parallel and distributed processing of visual content: tradi...

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Euromicro conference on Parallel, Distributed and Network-Based Processing

作者： A. Uhl Department of Scientific Computing Salzburg University Salzburg Austria

Summary form only given. In recent years, processing of visual content has emerged as a key technology in many areas. Applications include consumer electronics, medical imaging, videoconferencing, and scientific visualization. However, the creation, processing, and management of these data types require an enormous computational effort, often too high for single processor architectures. Therefore, this fact taken together with the inherent data parallelism makes image processing and video processing natural application areas for parallel and distributed computing. Based on experiences from organizing the workshop series "Parallel and Distributed Image Processing, Video Processing, and Multimedia PDIVM", the EuroPar Multimedia topic, and other editorial activities we identify past, current, and future trends in the research lines associated with processing of visual content on parallel and distributed systems.

关键词： Distributed processing Image processing Multimedia systems Consumer electronics biomedical imaging Teleconferencing Data visualization Computer architecture Parallel processing Distributed computing

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