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IEEE International Symposium on Biomedical Imaging

作者： Tron A. darvann Nuno V. Hermann Sune demant Per Larsen Hildur Ólafsdóttir Signe S. Thorup Marek Zak Angelo B. Lipira Alex A. Kane daniel Govier Helena Schatz daniel Rueckert Sven Kreiborg 3D Craniofacial Image Research Laboratory Copenhagen University Hospital Rigshospitalet Copenhagen Denmark DTU Informatics Technical University of Denmark Copenhagen Denmark 3D Craniofacial Image Research Laboratory School of Dentistry University of Copenhagen Copenhagen Denmark Pediatric Dentistry and Clinical Genetics School of Dentistry University of Copenhagen Copenhagen Denmark DTU Informatics Technical University of Denmark Lyngby Denmark Paediatric Rheumatology Clinic Copenhagen University Hospital Rigshospitalet Copenhagen Denmark Division of Plastic and Reconstructive Surgery University of Washington Seattle WA USA Division of Plastic and Craniofacial Surgery Childrens Medical Center Dallas TX USA Department of Surgery Washington University School of Medicine Saint Louis MO USA Cephalometric Imaging Laboratory School of Dentistry University of Copenhagen Copenhagen Denmark Visual Information Processing Department of Computing Imperial College London London UK Department of Clinical Genetics Copenhagen University Hospital Rigshospitalet Copenhagen Denmark

ISBN: (纸本)9781424441273

We present an automated method of spatially detailed 3d asymmetry quantification of face surfaces obtained in a stereophotogrammetric system, and the method was applied to a population of children with juvenile idiopathic arthritis (JIA) who have involvement of one temporomandibular joint (TMJ). Non-rigid registration of a patient face surface to a mirrored version of the same face surface provided a spatially dense map of left-right point correspondences that were used in the asymmetry calculation. For inter-patient comparison and modeling, detailed point correspondence was obtained by non-rigid registration of a symmetric atlas surface to a symmetric version of the patient surface. The method was validated by comparison to a landmark based method of asymmetry quantification, and the two methods were seen to provide similar results. The method was seen to be able to quantify typical patterns of asymmetry in JIA subjects with affected TMJ and compare them to a control population.

关键词： Face Manuals dentistry Arthritis Joints Educational institutions Three dimensional displays

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Automated quantification and analysis of mandibular asymmetry

Automated quantification and analysis of mandibular asymmetr...

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IEEE International Symposium on Biomedical Imaging

作者： Tron A. darvann Nuno V. Hermann Per Larsen Hildur Ólafsdóttir Izabella V. Hansen Hanne d. Hove Leif Christensen daniel Rueckert Sven Kreiborg 3D Craniofacial Image Research Laboratory Copenhagen Denmark DTU Informatics Technical University of Denmark Copenhagen Denmark Pediatric Dentistry and Clinical Genetics School of Dentistry University of Copenhagen Copenhagen Denmark Pediatric Dentistry and Clinical Genetics University of Copenhagen Copenhagen Denmark DTU Informatics Technical University of Denmark Lyngby Denmark Orthodontics School of Dentistry University of Copenhagen Copenhagen Denmark Orthodontics University of Copenhagen Copenhagen Denmark Department of Clinical Genetics Copenhagen University Hospital Rigshospitalet Copenhagen Denmark Department of Neurosurgery Århus University Hospital Århus Denmark Visual Information Processing Imperial College London London UK

ISBN: (纸本)9781424441259;9781424441266

We present an automated method of spatially detailed 3d asymmetry quantification in mandibles extracted from CT and apply it to a population of infants with unilateral coronal synostosis (UCS). An atlas-based method employing non-rigid registration of surfaces is used for determining deformation fields, thereby establishing detailed anatomical point correspondence between subjects as well as between points on the left and right side of the mid-sagittal plane (MSP). Asymmetry is defined in terms of the vector between a point and the corresponding anatomical point on the opposite side of the MSP after mirroring the mandible across the MSP. A principal components analysis of asymmetry characterizes the major types of asymmetry in the population, and successfully separates the asymmetric UCS mandibles from a number of less asymmetric mandibles from a control population.

关键词： Pediatrics Principal component analysis

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New concept of passive measure using GNSS reflected signals in oceanographic applications

New concept of passive measure using GNSS reflected signals ...

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OCEANS - Europe

作者： Sarab Tay Frederic Maussang Arnaud Coatanhay Rene Garello Institut Telecom / Telecom Bretagne UeB CNRS Lab-STICC / CID Image and Information Processing Department Technopôle Brest-Iroise Brest France E3I2 Laboratory CNRS EA 3876 ENSIETA-Ecole Nationale Superieure des Ingenieurs des Etudes et Techniques d''Armement Brest France

Today, one of the methods in monitoring oceans is the use of radar systems or more generally the use of electromagnetic diffusion. Thanks to the deployment of satellite navigation systems (GNSS), such as GPS, GNSS signals are being used more and more as an opportunity source for this kind of observation. This paper assesses the measurement of oceanographic parameters within a few meters near the surface. The oceanographic phenomena that is currently available for recording is limited. That is why we propose a much finer analysis of the diffusion and the scattering of GNSS signals near ocean surface, by employing very fine time steps and integration over the long periods of code. The final goal is to be able to perceive very fine phenomena, among which the ocean surface kinematics. In order to achieve this, the application of sophisticated processing algorithms is needed. In this work we simulate and highlight the observable effects expected as a result of use of such a method. The work is realized as a part of the MOPS project.

关键词： Sea measurements Satellite navigation systems Oceans Sea surface Electromagnetic measurements Monitoring Spaceborne radar Global Positioning System Signal analysis Electromagnetic scattering

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Study of morphologic response of chondrocytes to uniaxial compression of articular cartilage

Study of morphologic response of chondrocytes to uniaxial co...

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6th IASTEd International Conference on Biomedical Engineering, BioMEd 2008

作者： Wu, J.P. Kirk, T.B. Milne, N. delaney, P.M. 3D Image Laboratory School of Mechanical Engineering University of Western Australia Perth Australia School of Anatomy and Human Biology University of Western Australia Perth Australia Optiscan Pty Ltd. Melbourne VIC Australia

ISBN: (纸本)9780889867215

Osteoarthritis is synonymous to the functional disorder of articular cartilage. Mechanical tests of articular cartilage offer a way to understand the tissue's functionality and osteoarthritis. during normal activities, chondrocytes (cells) are indirectly exposed to varied mechanical compressions exerted on articular cartilage. Study of the morphological response of chondrocytes to the mechanical compressions exerted on articular cartilage offers understanding the physical integrity of chondrocytes, and initial physiological change of articular cartilage for detecting early osteoarthritis. Fibre optic confocal microscopy uses fibre optic imaging technologies to study the internal microstructure of bulk articular cartilage. The technologies have led to develop confocal arthroscopy for in vivo studying the cellular structure of articular cartilage. Using fibre optic laser confocal microscopy and a developed computer image analysis software, we studied the morphological response of the chondrocytes in the superficial and transitional zone to the uniaxial compression of articular cartilage at 0.25MPa and 0.5MPa. The results suggest that the mechanical compression exerted on articular cartilage caused morphological changes of the chondrocytes, which can be measured by the technique described in this study. The technique developed in this study shows potential to develop a methodology for in vivo studying the physiological integrity of chondrocyte and early osteoarthritis.

关键词： Fibers

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Identification of behaviour laws and failure criteria parameters of composites based on off axes tests application : Composite polyester/Alfa

Identification of behaviour laws and failure criteria parame...

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作者： Smaoui, Hichem Chafra, Moez Moussaoui, Ali Chevalier, Yvon URMCS ENIT-LASMAP Ecole Polytechnique of Tunisia Laboratory of Biometric Materials and 3D Image-making Kassab Instiute Tunisia Vibroacoustic Group 3 rue F. Hainaut 93407 SAINT OUEN cedex France

The purpose of the present study is to propose a method for identifying the mechanical behaviour of composite materials based on off axes tests for various directions, in a more general framework including a large range of geometrical variables used in industry. We propose a mechanism based mode which strongly depends on the structural anisotropy of the material and on the orientation of loading. For failure we use a quadratic surface similar to Hill criterion, the coefficients of which depend on the type and the direction of loading. The proposed identification method is applied to a composite made out of woven vegetal fibres and a polyester resin matrix. The fibres are extracted from Alfa leaves which are abundant in North Africa, and are commonly used in the manufacturing of high quality paper.

关键词： Composite materials

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High-speed optical sensor for security applications

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PHOTONICS SPECTRA 2004年第4期38卷 90-+页

作者： Grevel, Td 3D Image Processing GmbH

with the increasing demand for security, passive optical sensors are helping to keep the public's safety. They typically are used in video cameras that generate a two-dimensional image on a screen. As such, cameras gain stereo 3-d vision based on human brain function. A three-dimensional technology is under development by 3d image processing GmbH of Munich, Germany, that offers a way to perform real-time distance measurement.

关键词： Optical sensors

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Epiploic appendagitis masquerading as pulmonary embolism

CMIGExtra: Cases

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CMIGExtra: Cases 2004年第1期28卷 1-3页

作者： Sites, V. Wald, C. Scholz, F. Department of Diagnostic Radiology Lahey Clinic Medical Center Burlington MA 01805 United States Department of Radiology Lahey Clinic United States 3D Laboratory for Advanced Image Analysis and Virtual Surgical Planning Lahey Clinic United States

There has been recent interest in the radiological literature regarding the various clinical manifestations of epiploic appendagitis, which may mimic many acute abdominal and pelvic conditions. We present a case of appendagitis masquerading as pulmonary embolism;to our knowledge the first reported such presentation with primary thoracic symptoms and findings prompting an initial workup for suspected pulmonary thrombembolism. Radiographic findings, differential diagnosis and the pertinent literature are briefly discussed. © 2003 Elsevier Ltd. All rights reserved.

关键词： Atelectasis Epiploic appendagitis Pulmonary thrombembolism

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Elevation data compression using IFS-based three-dimensional fractal interpolation

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Chinese Optics Letters 2004年第10期2卷 582-585页

作者：吴思源周源华 Institute of Image Communication & Information Processing Shanghai Jiaotong University Shanghai 200030 Institute of Image Communication & Information Processing Shanghai Jiaotong University Shanghai 200030his letter presents a novel application of iterated function system (IFS) based three-dimensional (3D) fractal interpolation to compression elevation data. The parameters of contractive transformations axe simplified by a concise fractal iteration form with geometric meaning. A local iteration algorithm is proposed which can solve the non-separation problem when Collage Theorem is applied to find the appropriate fractal parameters. The elevation data compression is proved experimentally to be effective in reconstruction quality and time-saving.

This paper presents the application of iterated function system (IFS) based three-dimensional (3d) fractal interpolation to elevation data compression. The parameters of contractive transformations are simplified by a concise fractal iteration form with geometric meaning. A local iteration algorithm is proposed, which can solve the non-separation problem when Collage theorem is applied to find the appropriate fractal parameters. The elevation data compression is proved experimentally to be effective in. reconstruction quality and time-saving.

关键词： Algorithms Fractals Interpolation Iterative methods Three dimensional

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A New Method for 3d Finite Element Modeling of Human Mandible Based on CT data

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Journal of donghua University(English Edition) 2004年第1期21卷 29-33页

作者：于力牛叶铭王成焘 School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030his study presents a reliable method for the semi-automatic generation of an FE model which determines both geometrical data and bone properties from patient CT scans. 3D FE analysis is one of the best approaches to predict the stress and strain distribution in complex bone structures but its accuracy strongly depends on the precision of input information. In geometric reconstruction various methods of image processing geometric modeling and finite element analysis are combined and extended. Emphasis is given to the assignment of the material properties based on the density values computed from CT data. Through this technique the model with high geometric and material similarities were generated in an easy way. Consequently the patient-specific FE model from mandible CT data is realized also.

This study presents a reliable method for the semi-automatic generation of an FE model, which determines both geometrical data and bone properties from patient CT scans.3d FE analysis is one of the best approaches to predict the stress and strain distribution in complex bone structures, but its accuracy strongly depends on the precision of input information. In geometric reconstruction, various methods of image processing, geometric modeling and finite element analysis are combined and extended. Emphasis is given to the assignment of the material properties based on the density values computed from CT data. Through this technique, the model with high geometric and material similarities were generated in an easy way. Consequently, the patient-specific FE model from mandible CT data is realized also.

关键词： Computed Tomography Mandible Three-dimensional Finite Element Analysis

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Eurasip Journal on Applied Signal processing: Editorial

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Eurasip Journal on Applied Signal processing 2002年第10期2002卷 1003-1004页

作者： Strintzis, Michael G. Marques, Ferran Lavagetto, Fabio Information Processing Laboratory Electrical Engineering Department Aristotle University of Thessaloniki Thessaloniki 54006 Greece Informatics and Telematics Institute 1st Km Thermi-Panorama Road Thermi-Thessaloniki 57001 Greece Technical University of Catalonia UPC Campus Nord Modul D5 C/ Jordi Cirona 1-3 08034 Barcelona Spain Department of Communication DIST University of Cenova Via Opera Pia 13 Genova Italy Electrical Engineering Department University of Pittsburgh Pittsburgh PA United States University of Thessaloniki Thessaloniki Greece Info./Telematics Research Institute Thessaloniki Greece Swiss Fed. Institute of Technology EPFL Lausanne Switzerland Department of Signal Theory Polytechnic University of Catalonia Barcelona Spain Sign. and Image Processing Institute USC Los Angeles CA United States UPC Bercelona Spain AT and T Bell Laboratories Holmdel NJ United States University of Parma Parma Italy DIST University of Genova Genova Italy

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