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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481-490 订阅

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A new fluorescence image-processing method to visualize Ca2+ -release and uptake Endoplasmatic Reticulum microdomains in cultured glia

A new fluorescence image-processing method to visualize Ca2+...

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12th Mediterranean conference on Medical and Biological Engineering and computing, MEDICON 2010

作者： Titapiccolo, J. Ion Esposti, F. Fanelli, A. Signorini, M.G. Biomedical Engineering Department Politecnico di Milano Milan Italy Medical Research Council Laboratory of Molecular Biology Cambridge United Kingdom

ISBN: (纸本)9783642130380

Astrocytes perinuclear zone is an intracellular region of great interest for its role in calcium intracellular dynamics regulation. Indeed IP3R and SERCA molecules, located on the membrane of the Endoplasmic Reticulum (ER) in the perinuclear region, show a clustering self-organizing capacity that influences intracellular calcium signaling. IP3Rs and SERCA pumps have respectively the role to release cal-cium ions into the cytoplasm and segregate them into the ER. In this work astrocytes fluorescence recordings were acquired with a confocal microscope and calcium activity was stimu-lated by the use of ionomycin. A fluorescence image processing method to study the organization, localization and dimension of these molecular clusters was developed. The method has been called DMSD and it leads to the visualization of a false-color map where the preferential behavior of each time series pixel is represented. In this way Ca2+ release and uptake ER membrane microdomains can be clearly identified. © 2010 International Federation for Medical and Biological Engineering.

关键词： Fluorescence

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Gaze contingent control for an articulated mechatronic laparoscope

Gaze contingent control for an articulated mechatronic lapar...

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IEEE/RAS-EMBS International conference on biomedical Robotics and Biomechatronics (BioRob)

作者： David P. Noonan George P. Mylonas Jianzhong Shang Christopher J. Payne Ara Darzi Guang-Zhong Yang Department of Biosurgery and Surgical Technology Department of Computing Institute of Biomedical Engineering Imperial College London London UK Department of Biosurgery and Surgical Technology Department of Computing Institute of Biomedical Engineering Imperial College London London UK

This paper introduces two techniques for controlling an articulated mechatronic laparoscope through the eyes of the surgeon during minimally invasive surgery. The system consists of a 2D eye tracking unit interfaced with a mechatronic laparoscope that has five controllable degrees-of-freedom (DoF) located at the distal end of a rigid shaft. Through the use of image feedback from a tip mounted camera, a closed-loop gaze contingent framework featuring two separate control techniques (“Individual Joint Selection” and “Automatic Joint Selection”) was developed. Under this framework, the location of a surgeon's 2D fixation point is converted into commands that servo the laparoscope. Experimental results illustrate the ability of both techniques to perform real-time gaze contingent laparoscope control. A key advantage of the proposed system is the ability to provide the operator with sufficient distal dexterity to achieve stable off-axis visualisation in an intuitive, hands-free manner, thus allowing other handheld instruments to be controlled simultaneously. Potential applications include Single Incision Laparoscopic Surgery (SILS) or Natural Orifice Trans-Endoluminal Surgery (NOTES), where the use of multiple instruments passing through a single incision presents both visualization and ergonomic challenges.

关键词： Joints Robots Laparoscopes Surgery visualization Cameras Instruments

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Study on cerebral vascular extraction and three-dimensional reconstruction based on MRI

Study on cerebral vascular extraction and three-dimensional ...

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IEEE International conference on Progress in Informatics and computing (PIC)

作者： Fei Gu Ling Tao Department of Biomedical Engineering Nanjing University of Aeronautics and Astronautics Nanjing China

Information extraction and three-dimensional reconstruction of blood vessel are keystones in visualization of medical images. Firstly, an improved Sobel algorithm combined with fuzzy theory is presented, which is used to extract the cerebral information of serial images and can solve the contradiction between preservation of detail information and high de-noising ability effectively. Then, an improved ray casting volume rendering algorithm based on fusion segmentations is used to improve the rendering speed with a better rendering quality. The experiments show that the presented new method can preserve more complete blood vessel 3-D information and obtain good de-noising effect. This new method can produce better rendering quality and speeds up the volume rendering.

关键词： Casting Rendering (computer graphics) biomedical imaging Surgery Image reconstruction

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A framework of web3D-based medical data reconstruction and visualization

A framework of web3D-based medical data reconstruction and v...

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International conference on e-health Networking, Applications and Services (HealthCom)

作者： Sittapong Settapat Virasin Archirapatkave Tiranee Achalakul Michiko Ohkura Division of Functional Control Systems Graduate School of Engineering Shibaura Institute of Technology Tokyo Japan Department of Computer Engineering Faculty of Engineering King Mongkut's University of Technology Bangkok Thailand Faculty of Engineering Shibaura Institute of Technology Tokyo Japan

A 3D reconstruction and visualization framework from a sequence of 2D cross-sectional images has aroused extensive concern particularly in medical science and engineering. In this research, we design parallel reconstruction and visualization frameworks for medical data reconstruction and visualization. Reconstruction methods for medical data normally require high-performance computing. In this paper we make a web-based 3D reconstruction service and present a parallel computing framework for real-time processing. The visualization framework design visualizes a generated 3D model. Moreover, we implement a web-based 3D medical data reconstruction and visualization application that integrates both proposed frameworks and design our framework integrated with X3D technology and a modular approach. The web-based X3D framework integrated with a modular approach can extend cross-platform and inter-application data transfer ability and support run-time architecture to represent and communicate 3D scenes and objects.

关键词： Data visualization biomedical imaging Computational modeling Process control Load modeling Data models Three dimensional displays

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Locally Linear Embedding for the Construction of the Purkinje System

Locally Linear Embedding for the Construction of the Purkinj...

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International conference on biomedical Engineering and Computer Science (ICBECS)

作者： Jie Li Kuanquan Wang Wangmeng Zuo Yongfeng Yuan Bio-computing Research Center School of Computer Science and Technology Harbin Institute of Science and Technology Harbin China

Locally linear embedding (LLE), recently proposed unsupervised procedure for mapping high-dimensional data nonlinearly to a lower-dimensional space, is shown to yield remarkable good results in exploratory analysis and visualization. LLE is able to learn the global structure of nonlinear manifolds, and it maps its inputs into a single global coordinate system of lower dimensionality, which takes good advantage of remaining points close to each other in the computed low-dimensional space when they are close to each other in the high-dimensional space. However, the application to the closed geometry is consequently limited. The purkinje system is a very important conduction system in the endocardial surface of the ventricle that is a semi-closed organ. Traditional construction of the purkinje system is mostly relevant to the fractal tree or something similar, which is based of supposed theory and is an approximation to the actuality. In this paper, a novel method for the construction of the purkinje system in the canine left ventricle by applying LLE algorithm is proposed. The results show that the construction of the purkinje system approaches the one in real structure of the left ventricle better than ever reconstructed.

关键词： Geometry Space technology Data visualization Image reconstruction Computer science Fractals biomedical imaging Magnetic resonance imaging Computed tomography Reconstruction algorithms

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Head position monitoring system

Head position monitoring system

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12th Mediterranean conference on Medical and Biological Engineering and computing, MEDICON 2010

作者： Cech, P. Dlouhy, J. Cizek, M. Rozman, J. Vicha, I. Department of Biomedical Engineering Brno University of Technology Kolejni 4 Brno Czech Republic Department of Ophthalmology University Hospital Brno Brno Czech Republic

ISBN: (纸本)9783642130380

The head position monitoring system is designed for monitoring patient head after special ophthalmological operation called vitrectomy. In the final phase of this operation a certain amount of vitreous is replaced with an expansive gas or oil bubble. This bubble presses the retina parts together allowing its better recovery. Correct position of the head during recovery time is therefore important. The designed system consists of a telemetric monitoring unit and communication unit. The monitoring unit provides periodical tilt sensing using the digital MEMS accelerometer. The tilt angle and corresponding time are stored in built-in memory. The patient is also warned by sound alarm when posture of head is incorrect. The second part of this system is communication unit which provides communication with the monitoring unit via wireless interface. This communication supports single or continual mode, so the measured data can be available immediately or after treatment period. The third important part of entire system is a special software application, which provides communication such as setting up the device and downloading the data of measurement. It also serves for data visualization and analyzing. The presented system is a combination of biofeedback and data logging system. The goal is to help the patient with maintenance of correct head posture. Secondly it is a powerful diagnostic tool for ophthalmological specialists. © 2010 International Federation for Medical and Biological Engineering.

关键词： Biofeedback

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Real Time biomedical Data Streaming Platform (RIMES): a data-intensive virtual environment

Real Time Biomedical Data Streaming Platform (RIMES): a data...

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The Third International Joint conference on Computational Science and Optimization(第三届计算科学与优化国际大会 CSO 2010)

作者： Kai Nan Kejun Dong Jurgen Schulze Peter Arzberger Dong Xu Wilfred Li Cindy Zheng Sameer Tilak Computer Network Information Center Chinese Academy of Sciences China University of California San Diego USA

In this paper we present Real time biomedical data Streaming platform (RIMES), a data-intensive virtual environment, under joint development by Computer Network Information Center and University of California, San Diego. RIMES extends scientists' desktops to biomedical grid computation resources and mass storage systems, by means of streaming biomedical data through internet-based Data Turbine cloud. Researchers may conduct activities related to job submission, data processing and real time visualization within the environment. RIMES may also be suitable to other data-intensive areas such as geosciences and ecoinformatics.

关键词： biomedical research data streaming grid computing e-science real time visualizatwn Data Turbine

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Complete 3D model reconstruction using a depth sensor

Complete 3D model reconstruction using a depth sensor

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International conference on Intelligent computing and Integrated Systems (ICISS)

作者： Guangyu Mu Miao Liao Ruigang Yang Dantong Ouyang Zhiwen Xu Xiaoxin Guo Department of Computer Science and Technology Jilin University Changchun China Department of Engineering Center of Visualization and Virtual Environment University of Kentucky Lexington USA Department of Computer Science and Technology Key Laboratory of Symbolic Computation and Knowledge Engineering of MOE Jilin University Changchun China

We propose a fast and simple application system of 3D model reconstruction. We acquire range images by using a combination of a regular camera and a depth sensor. The reconstruction of a 3D model consists of four key steps: (i) Initial alignment either feature tracking or the 4-points congruent sets algorithm is used to align surfaces captured at different frames. (ii)The iterative closest point (ICP) method is applied to further align the piecewise surfaces from the last step. (iii) The surfaces are merged into a whole 3D model by the volumetric method. (iv) In the refinement step, we fill holes and produce a complete 3D model that approximates the original model with robust repair of polygonal models. At last, we present the experimental results which show that the errors between our reconstructed model and the ground truth are less than 1%.

关键词： biomedical imaging Uncertainty

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Democratization of healthcare through self-monitoring technologies

Democratization of healthcare through self-monitoring techno...

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International conference on Pervasive computing Technologies for Healthcare, PervasiveHealth

作者： Dana Pavel Vic Callaghan Anind K. Dey School of Computer Science and Electronic Engineering University of Essex Wivenhoe UK Human-Computer Interaction Institute Carnegie Mellon University Pittsburgh PA USA

The burden on our healthcare systems is ever increasing with people living longer and requiring more support. Technologies can help ease the strain. One important aspect in health management is prevention enabled by self-monitoring and, eventually, self-understanding one's lifestyle through building supportive, interactive and engaging systems. This paper outlines a system aimed at empowering users with a better understanding of how their lifestyles can impact their wellbeing by using a context-based story-telling approach. While this work is still in its early phases, we believe that a lot of promise is shown through the current development status as well as our system design. Our initial findings show that available user data generated through our daily activities can reveal a wealth of information related to our lifestyles and provide support in implementing changes.

关键词： Medical services biomedical monitoring Heart Computerized monitoring Computer science Capacitive sensors Risk management Diseases Sensor systems visualization

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Texture Slab Projection and BSP tree for GPU Accelerated Volume Rendering

Texture Slab Projection and BSP tree for GPU Accelerated Vol...

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The 4th International conference on Bioinformatics and biomedical Engineering(第四届IEEE生物信息与生物医学工程国际会议 iCBBE 2010)

作者： Guojun Ma Yousai Zhang School of Electronics and Information Jiangsu University of Science and Technology Zhenjiang jiangsu 212003 China

An improved method using graphics processing unit(GPU) is proposed for ray casting algorithm because of largevolume data and slow speed in volume rendering. The algorithmcombines texture slices to form texture slabs, and codes textureslabs with BSP tree, then, projects the slabs and renders non-emptyslabs from front to back. Because of texture slabprojection includes information of empty region, full region andearly ray terminated region of volume data, so acceleratedvolume rendering can be achieved through texture slabprojection along the ray direction. Texture slab projection iscreated on the fly by GPU without any pre-processing time, and the creation time of BSP tree is still small in relation to the wholevolume rendering. The experiment results show that this methodcan speed up average 3.41 times of volume rendering on GPUand achieve good rendering effects.

关键词： Slabs Acceleration Rendering (computer graphics) Tree graphs Graphics Casting biomedical imaging Hardware Data visualization Scientific computing

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