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THE VERSATILITY OF AUTOMATIC MESH GENERATORS BASED ON TREE-STRUCTURES AND ADVANCED GEOMETRIC CONSTRUCTS

COMMUNICATIONS IN APPLIED NUMERICAL METHODS 1988年第3期4卷 379-392页

作者： SHEPHARD, MS BAEHMANN, PL GRICE, KR Center for Interactive Computer Graphics Rensselaer Polytechnic Institute Troy NY 12180-3590 U.S.A. Associate Professor Department of Mechanical and Civil Engineering. Research Engineer.

The ability of the finite octree and finite quadtree automatic mesh generators to satisfy effectively a wide variety of meshing capabilities is demonstrated. Areas considered include the ability to integrate easily with geometric modelling systems, versatile interactive mesh control functions, the ability to reorder unknowns directly from the finite element data structure and the ability to support automated finite element modelling.

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Magnetic Resonance Based Control of a Robotic Manipulator for Interventions in the Beating Heart

Magnetic Resonance Based Control of a Robotic Manipulator fo...

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2011 IEEE International Conference on Robotics and Automation(2011年IEEE世界机器人与自动化大会 ICRA 2011)

作者： Nikolaos V. Tsekos Johann Lamaury Erol Yeniaras Zhigang Deng Nikhil V. Navkar Dipan J. Shah Karen Chin Medical Robotics Laboratory Department of Computer Science at University of HoustonHoustonTX 77204 Computer Graphics and Interactive Media Lab. Department of Computer ScienceUniversity of HoustonHo Methodist DeBakey Heart & Vascular Center HoustonTX 77030 USA

As a part of an ongoing project, in this paper we introduce the first version of a system which has a novel methodology for Cine (as in cinema) MRI based control of a cardiac robot for beating heart surgeries. The system uses the preoperative planning approach that we developed earlier, and integrates it to the intraoperative algorithms for controlling a robot and tracking some specific landmarks of a highly dynamical surgical field. In particular, our late studies presented herein aim to demonstrate the feasibility of integrating appropriate computational tools to achieve the volumetric image guidance for minimally invasive surgeries in the beating heart. We conceive of the system as practicable for in vitro experiments upon the completion of the first physical prototype, which may pave the way for expansion of the approach for other complex surgeries as well.

关键词： Heart Magnetic resonance imaging Manipulators Surgery Robot kinematics Valves

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Fitting 3D garment models onto individual human models

Fitting 3D garment models onto individual human models

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作者： Li, Jituo Ye, Juntao Wang, Yangsheng Bai, Li Lu, Guodong Digital Interactive Media Lab Institute of Automation Chinese Academy of Sciences No. 95 Zhongguancuan East Road Beijing 100190 China Engineering Research Center of Digitized Textile and Fashion Technology Ministry of Education Donghua University Shanghai 201620 China Institute of Engineering and Computer Graphics Mechanical Department of Zhejiang University Zhejiang University Yuquan Campus No. 38 Zheda Road Hangzhou 310027 China School of Computer Science University of Nottingham Nottingham United Kingdom

Designing an elegant 3D virtual garment model for a 3D virtual human model is labor-intensive, because most existing garment models are custom-made for a specific human model and cannot be easily reused for other individuals. In this paper, we propose a novel method for fitting a given 3D garment model onto human models of various body shapes and poses. The fitting is accomplished by deforming the garment mesh to match the shapes of the human models by using a combination of the following: skeleton-driven volumetric deformation, garmenthuman shape similarity matching and evaluation, the constraints of garmenthuman contact, and garmenthuman ease allowance. Experiments show that our approach performs very well and has the potential to be used in the garment design industry. © 2010 Elsevier Ltd.

关键词： Musculoskeletal system

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Real-time out-of-core visualization of particle traces

Real-time out-of-core visualization of particle traces

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IEEE Symposium on Parallel and Large-Data Visualization and graphics (PVG)

作者： R. Bruckschen F. Kuester B. Hamann K.I. Joy Visualization and Graphics Research Group Center for Image Processing and Integrated Computing Department of Computer Science University of California Davis CA USA Visualization and Interactive Systems Group Department of Electrical and Computer Engineering University of California Irvine CA USA

ISBN: (纸本)0780372239

Visualization of particle traces provides intuitive and efficient means for the exploration and analysis of complex vector fields. The paper presents a method suitable for the real-time visualization of arbitrarily large time-varying vector fields in virtual environments. We describe an out-of-core scheme in which two distinct pre-processing and rendering components enable real-time data streaming and visualization. The presented approach yields low-latency application start-up times and small memory footprints. The described system was used to implement a "volumetric fog lance," which can emit up to 60000 particles into a flow field while maintaining an interactive frame rate of 60 frames per second. All algorithms were specifically designed to support commodity hardware. The proof-of-concept system is running on a low-cost Linux workstation equipped with a 120 GB E-IDE RAID (redundant array of inexpensive disk) system.

关键词： Data visualization Computational modeling Computational fluid dynamics Motion pictures Hardware computer graphics interactive systems Image processing computer science Image analysis

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Extracting geometric features of aortic valve annulus motion from dynamic MRI for guiding interventions

Extracting geometric features of aortic valve annulus motion...

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IEEE International Symposium on Biomedical Imaging

作者： Nikhil V. Navkar Erol Yeniaras Dipan J. Shah Nikolaos V. Tsekos Zhigang Deng Medical Robotics Laboratory Department of Computer Science University of Houston Houston TX USA Methodist DeBakey Heart & Vascular Center Methodist Hospital Houston TX USA Computer Graphics and Interactive Media Laboratory Department of Computer Science University of Houston Houston TX USA

ISBN: (纸本)9781424441273

Transcatheter aortic valve implant (TAVI) has emerged as a prominent approach for treating aortic stenosis. Success of such implants depends upon the accurate assessment of the geometric features such as the diameter, center and orientation of the aortic valve annulus (AVA). In this paper, we present a method for extracting these geometric features from magnetic resonance images (MRI). The method is based on finding an optimal fit for a circular ring mimicking AVA in the aortic root. Moreover, the presented approach provides dynamic tracking of the AVA in CINE MR images. This approach can be used for preoperative planning of prosthetic valve implantation, as well as for the emerging MRI guided manual, or with robot-assisted, annuloplasty.

关键词： Valves Magnetic resonance imaging Robots Heart Tracking Prosthetics

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Enabling virtual assembly training in and beyond the automotive industry

Enabling virtual assembly training in and beyond the automot...

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International Conference on Virtual Systems and MultiMedia

作者： André Stork Neyir Sevilmis Daniel Weber Dominic Gorecky Christian Stahl Matthias Loskyll Frank Michel Interactive Engineering Technologies Fraunhofer Institute of Computer Graphics Research (IGD) Darmstadt Germany Innovative Factory Systems German Research Center for Artificial Intelligence Kaiserslautern Germany Augmented Vision German Research Center for Artificial Intelligence Kaiserslautern Germany

Virtual assembly training systems show a high potential to complement or even replace physical setups for training of assembly processes in and beyond the automotive industry. The precondition for the breakthrough of virtual training is that it overcomes the problems of former approaches. The paper presents the design approach taken during the development of a game-based, virtual training system for procedural assembly knowledge in the EU-FP7 project VISTRA. One key challenge to address when developing virtual assembly training is the extensive authoring effort for setting up virtual environments. Although knowledge from the product and manufacturing design is available and could be used for virtual training, a concept for integration of this data is still missing. This paper presents the design of a platform which transfers available enterprise data into a unified model for virtual training and thus enables virtual training of workers at the assembly line before the physical prototypes exist. The data requirements and constraints stemming from industrial partners involved in the project will be discussed. A second hurdle for virtual training is the insufficient user integration and acceptance. In this context, the paper introduces an innovative hardware set-up for game-based user interaction, which has been chosen to enhance user involvement and acceptance of virtual training.

关键词： Training Assembly Data models Solid modeling Hardware Production Geometry

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Advances in Visual Computing 1

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丛书名： Lecture Notes in computer Science

1000年

作者： George Bebis Richard Boyle Bahram Parvin Darko Koracin Ryan McMahan Jason Jerald Hui Zhang Steven M. Drucker Chandra Kambhamettu Maha Choubassi Zhigang Deng Mark Carlson

ISBN: (数字)9783319143644

ISBN: (纸本)9783319143637

The two volume set LNCS 8887 and 8888 constitutes the refereed proceedings of the 10th International Symposium on Visual Computing, ISVC 2014, held in Las Vegas, NV, USA. The 74 revised full papers and 55 poster papers presented together with 39 special track papers were carefully reviewed and selected from more than 280 submissions. The papers are organized in topical sections: Part I (LNCS 8887) comprises computational bioimaging, computer graphics; motion, tracking, feature extraction and matching, segmentation, visualization, mapping, modeling and surface reconstruction, unmanned autonomous systems, medical imaging, tracking for human activity monitoring, intelligent transportation systems, visual perception and robotic systems. Part II (LNCS 8888) comprises topics such as computational bioimaging , recognition, computer vision, applications, face processing and recognition, virtual reality, and the poster sessions.

关键词： Pattern Recognition computer graphics Image Processing and computer Vision User Interfaces and Human computer Interaction Information Systems Applications (incl. Internet) Computational Biology/Bioinformatics

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Advances in Visual Computing 1

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丛书名： Lecture Notes in computer Science

1000年

作者： George Bebis Richard Boyle Bahram Parvin Darko Koracin Ryan McMahan Jason Jerald Hui Zhang Steven M. Drucker Chandra Kambhamettu Maha Choubassi Zhigang Deng Mark Carlson

ISBN: (数字)9783319142494

ISBN: (纸本)9783319142487

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Robot-assisted mechanical scanning and co-registration of Magnetic Resonance Imaging and light-induced fluorescence

Robot-assisted mechanical scanning and co-registration of Ma...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Ahmet E. Sonmez William M. Spees Alpay Özcan Zhigang Deng Andrew G. Webb Nikolaos V. Tsekos Medical Robotics Laboratory Department of Computer Science at University of Houston Houston TX USA Biomedical Magnetic Resonance Laboratory Washington University St. Louis MO USA Arlington Innovation Center Virginia Polytechnic Institute and State University Arlington VA USA Computer Graphics & Interactive Media Lab and Computer Science Department at University of Houston Houston TX USA Department of Radiology Leiden University Medical Center Leiden Netherlands

Robotic manipulators offer some unique opportunities to address research and clinical needs. Among those is the potential use of a robotic manipulator to mechanically scan the tissue of interest with biosensors that have limited tissue penetration. In such cases, the robot can serve a dual role. First, it can perform spatial scanning with the biosensor along a pre-selected path inside the tissue. Second, it can function as the mechanical link to spatially co-register the data collected with the biosensor and the images of a guidance modality. Herein, we describe a robotic system to mechanically scan with a light-induced fluorescence (LIF) sensor and co-register LIF data to the guiding modality of MRI. Specifically, a custom-built MR-compatible endoscope was integrated onto the end-effector of an MR-compatible manipulator to collect MRI-guided LIF 1D scans. A miniature radiofrequency (RF) coil attached onto the end-effector was used as a fiducial marker for co-registering LIF and MRI. This mechanically scanning system was investigated on two compartment phantoms, each with different optical agents. Those studies demonstrated “robot-assisted” multi-modality co-registration, i.e. the spatial distribution of the LIF signals matched with the MR guiding images. The system can incorporate additional sensors for collecting complementary biochemical information.

关键词： Optical fibers Manipulators Robot sensing systems Probes Coils

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MultiAR: A Multi-User Augmented Reality Platform for Biomedical Education

MultiAR: A Multi-User Augmented Reality Platform for Biomedi...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Markus Perz Gijs Luijten Jens Kleesiek Dieter Schmalstieg Jan Egger Christina Gsaxner Institute of Computer Graphics and Vision Graz University of Technology Graz Austria Institute for Artificial Intelligence in Medicine University Medicine Essen Essen Germany Cancer Research Center Cologne Essen West German Cancer Center Essen Germany Institute for Visualization and Interactive Systems University of Stuttgart Stuttgart Germany Virtual and Extended Reality in Medicine (ZvRM) University Hospital Essen Essen Germany

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

This paper addresses the growing integration of Augmented Reality (AR) in biomedical sciences, emphasizing collaborative learning experiences. We present MultiAR, a versatile, domain-specific platform enabling multi-user interactions in AR for biomedical education. Unlike platform-specific solutions, MultiAR supports various AR devices, including handheld and head-mounted options. The framework extends across domains, augmenting biomedical education applications with collaborative capabilities. We define essential requirements for a multi-user AR framework in education, detail MultiAR’s design and implementation, and comprehensively evaluate it using anatomy education examples. Quantitative and qualitative analyses, covering system performance, accuracy metrics, and a user study with 20 participants, highlight the urgent need for a tailored collaborative AR platform in biomedical education. Results underscore enthusiasm for collaborative AR technology, endorsing MultiAR as an accessible, versatile solution for developers and end-users in biomedical education.

关键词： Measurement Accuracy Federated learning System performance Education Collaboration Anatomy Engineering in medicine and biology Augmented reality

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