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Reconstruction Dimages De Resonance Magnetique A Partir De Lespace K Partiel
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Book Synopsis Reconstruction d'images de résonance magnétique à partir de l'espace k partiel by : Josiane Adrienne Yankam Njiwa
Download or read book Reconstruction d'images de résonance magnétique à partir de l'espace k partiel written by Josiane Adrienne Yankam Njiwa and published by . This book was released on 2007 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans le souci d'éviter les artéfacts que pourrait provoquer le mouvement sur la qualité des images, l'obtention de temps d'acquisition de données courts est essentielle en imagerie par résonance magnétique (IRM). En particulier, comme des sujets malades ont la plus part du temps des difficultés à retenir leur respiration pendant l'examen, il devient par conséquent impératif de recueillir l'information nécessaire le plus rapidement possible dans certaines études, telles que celles réalisées en imagerie cardiaque. L'acquisition partielle des données de l'espace k est une pratique couramment utilisée dans le but de diminuer le temps d'acquisition des données en IRM. La nécessité d'accélérer ce temps d'acquisition et/ou d'augmenter la résolution spatiale des images en résonance magnétique nucléaire (RMN), a conduit à la proposition de plusieurs méthodes de reconstruction qui acquièrent les données de l'espace k de façon partielle, tant pour des objets statiques que pour des objets ou études dynamiques. Ces méthodes utilisent des informations à priori (données acquises) pour retrouver celles manquantes. Ce manuscrit présente trois méthodes de reconstruction IRM utilisant les données de l'espace k acquises partiellement. La première méthode proposée est dédiée à la reconstruction d'objets ou d'organes statiques, tandis que les deux autres sont consacrées à la reconstruction d'organes dynamiques (application à l'imagerie cardiaque). Ces trois méthodes sont basées sur l'utilisation, dans l'algorithme de reconstruction, du concept d'image analytique, combinée, dans le cas des images statiques, à l'exploitation des redondances dans les données de l'espace k, et à l'utilisation des redondances temporelles associées à la substitution des données, pour les organes en mouvement. Ces méthodes ont été évaluées, dans le cadre de la reconstruction d'images statiques, par des expériences sur des images simulées auxquelles ont été rajouté un terme de phase pour la destruction de la symétrie hermitienne. On a utilisé également des fantômes physiques et de vraies images de cerveaux humains. Les deux autres méthodes ont été évaluées par des expériences sur de vraies séquences ciné cardiaques humaines. Le schéma de reconstruction proposé pour la reconstruction d'images statiques permet la réalisation d'une réduction du temps d'acquisition d'un facteur de 2. En ce qui concerne les images dynamiques, une réduction du temps d'acquisition d'un facteur de 4 a été réalisée, tout en maintenant une bonne qualité de reconstruction, tant sur le plan visuel que quantitatif (bon rapport signal sur bruit, faibles valeurs d'erreurs).
Book Synopsis METHODOLOGIES POUR L'IMAGERIE PAR RESONANCE MAGNETIQUE UTILISANT LA TECHNIQUE DE PROJECTION - RECONSTRUCTION by : YANNICK.. CREMILLIEUX
Download or read book METHODOLOGIES POUR L'IMAGERIE PAR RESONANCE MAGNETIQUE UTILISANT LA TECHNIQUE DE PROJECTION - RECONSTRUCTION written by YANNICK.. CREMILLIEUX and published by . This book was released on 1994 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJET DE CETTE THESE CONCERNE LE DEVELOPPEMENT METHODOLOGIQUE DE TECHNIQUES D'IMAGERIE PAR RESONANCE MAGNETIQUE UTILISANT LE PRINCIPE DE LA PROJECTION-RECONSTRUCTION. LE PREMIER CHAPITRE CONTIENT UN RAPPEL DES BASES PHYSIQUES ET DES PRINCIPALES METHODES DE L'IRM. LE PROCESSUS D'ACQUISITION DES DONNEES ET LES DIFFERENTES METHODES DE RECONSTRUCTION DES IMAGES EN PROJECTION-RECONSTRUCTION SONT PRESENTES AU COURS DU DEUXIEME CHAPITRE. CE CHAPITRE CONTIENT EGALEMENT UNE PRESENTATION DES AVANTAGES ET INCONVENIENTS COMPARES DE LA PROJECTION-RECONSTRUCTION ET DE L'IMAGERIE PAR TRANSFORMEE DE FOURIER. LE TROISIEME CHAPITRE PORTE SUR LES TECHNIQUES D'IMAGERIE RAPIDE ET EN PARTICULIER CELLES QUI SONT FONDEES SUR LA PROJECTION-RECONSTRUCTION. LE DEVELOPPEMENT ET LA MISE EN UVRE DE SEQUENCES RAPIDES A BASE D'ECHOS DE GRADIENT UTILISANT LA PROJECTION-RECONSTRUCTION Y SONT DONC PRESENTES. UNE ETUDE SUR FONTOME DU CONTRASTE DE CES SEQUENCES PERMET DE VALIDER LEURS EQUIVALENCES AVEC LES SEQUENCES D'IMAGERIE RAPIDE EN REGIME D'EQUILIBRE DYNAMIQUE EXISTANT EN IMAGERIE DE FOURIER. LE DERNIER CHAPITRE TRAITE DE DIFFERENTS APPORTS METHODOLOGIQUES NOUVEAUX CONCERNANT LA PROJECTION-RECONSTRUCTION. UNE FENETRE DE PONDERATION EST PROPOSEE POUR LIMITER LES ARTEFACTS INDUITS PAR L'ACQUISITION PARTIELLE DE L'ESPACE DE FOURIER. L'OBTENTION D'IMAGES A PARTIR DE SIGNAUX DE PRECESSION LIBRE EN PRESENCE DE GRADIENT EST EGALEMENT PROPOSEE. ENFIN, LA CORRECTION DES ARTEFACTS INDUITS PAR LES EFFETS DE DEPLACEMENT CHIMIQUE EN PROJECTION-RECONSTRUCTION EST ABORDEE
Book Synopsis Magnetic Resonance Image Reconstruction by : Mehmet Akcakaya
Download or read book Magnetic Resonance Image Reconstruction written by Mehmet Akcakaya and published by Academic Press. This book was released on 2022-11-04 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Resonance Image Reconstruction: Theory, Methods and Applications presents the fundamental concepts of MR image reconstruction, including its formulation as an inverse problem, as well as the most common models and optimization methods for reconstructing MR images. The book discusses approaches for specific applications such as non-Cartesian imaging, under sampled reconstruction, motion correction, dynamic imaging and quantitative MRI. This unique resource is suitable for physicists, engineers, technologists and clinicians with an interest in medical image reconstruction and MRI. Explains the underlying principles of MRI reconstruction, along with the latest research“/li> Gives example codes for some of the methods presented Includes updates on the latest developments, including compressed sensing, tensor-based reconstruction and machine learning based reconstruction
Book Synopsis Imagerie de résonance magnétique by : Michel Décorps
Download or read book Imagerie de résonance magnétique written by Michel Décorps and published by EDP Sciences. This book was released on 2012-12-03T00:00:00+01:00 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'imagerie par résonance magnétique s'est développée de manière prodigieuse au cours des quarante dernières années et le champ d'application des méthodes mises en œuvre, mais aussi leur complexité, s'accroissent de manière continue. Ce livre scientifique a pour objectif de décrire de manière rigoureuse les différentes méthodes de production d'une image par résonance magnétique. Les différentes étapes de production d'une image sont présentées : excitation spatialement sélective, codage de l'espace, traitement des données. Les multiples séquences d'impulsions constituant la panoplie des utilisateurs de l'IRM sont décrites de manière détaillée, depuis les séquences de base de type écho de gradient ou écho de spin, jusqu'aux séquences rapides exploitant l'établissement d'un état stationnaire, et aux balayages écho-planar ou spirale. La description couvre des aspects plus complexes, comme les techniques d'excitation spatiale multi-dimensionnelle ou l'imagerie parallèle.
Book Synopsis Reconstruction d'images en imagerie par résonance magnétique by : Sabine Husse
Download or read book Reconstruction d'images en imagerie par résonance magnétique written by Sabine Husse and published by . This book was released on 2004 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Radical Scan Strategies and Image Reconstruction in MRI by : Ralf Lethmate
Download or read book Novel Radical Scan Strategies and Image Reconstruction in MRI written by Ralf Lethmate and published by . This book was released on 2001 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Récemment, un fort regain d'intérêt pour les techniques d'échantillonnage radia en Imagerie de Résonance Magnétique (IRM) est perceptible. Elles permettent d'imager des objets ayant des temps de relaxation transversal très courts et sont peu sensibles aux mouvements. Nous proposons dans ce travail 1) de nouvelles stratégies d'échantillonnage radial 2D/3D et 2) des algorithmes avancés de reconstruction d'image IRM, tels que la techniques de "gridding" utilisant des compensations de densité original, les méthodes Bayésiennes et BURS. Ces algorithmes constituent une avancée considérable dans le monde IRM puisque la reconstruction d'image est possible à partir de tout échantillonnage. Pour augmenter l'intensité du signal, il est avantageux de l'échantillonner dès la montée des gradients, les positions des échantillons diffèrent alors des positions idéales des distributions utilisées (Projection Reconstruction (PR-2D) et linogramme). Or, la reconstruction de l'image nécessite la connaissance précise de ces dernières, qui peuvent être estimées grâce à une expérience préliminaire ou une approche fondée sur la transformation de Gabor. En imagerie 3D, nous proposons cinq équidistributions isotropes que nous comparons à la technique PR-3D, qui souffre d'un sur-échantillonnage excessif sur les pôles. Nous avons mis l'accent sur la qualité d'image, la facilité d'implantation sur l'imageur et els temps d'acquisition qui peuvent ainsi être réduits de 30%. À notre connaissance, ces équidistributions n'ont jamais été appliquées à l'IRM auparavant. Nous proposons également une nouvelle méthode d'imagerie dynamique 3D, prometteuse pour l'angiographie, l'imagerie de perfusion, etc. Elle est fondée sur ces équidistributions et utilise une nouvelle approche "keyhole-sphérique". Tout en ajoutant la dimension temporelle, le temps d'acquisition reste identique à celui d'une acquisition radiale 3D classique. Les résultats sont présentés pour des pseudo-données et des données réelles.
Book Synopsis Imagerie spectroscopique spirale par résonance magnétique à 7 T by : Bassem Hiba
Download or read book Imagerie spectroscopique spirale par résonance magnétique à 7 T written by Bassem Hiba and published by . This book was released on 2004 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une méthode rapide d'imagerie spectroscopique par résonance magnétique basée sur l'encodage spiral est développée et adaptée aux applications sur le petit animal. Différentes solutions techniques comme l'utilisation de schéma d'encodage spiral croissant-décroissant, l'implantation du réglage automatique de l'homogénéité du champ magnétique, la mesure de la trajectoire spirale dans l'espace K et une reconstruction d'images adaptée ont été étudiées et implémentées. Cette méthode est validée in vitro et in vivo sur le cerveau de rat à 7 T. Une comparaison entre la méthode développée et la méthode conventionnelle d'imagerie spectroscopique est menée afin d'évaluer son intérêt pour les modèles animaux. Cette méthode est ensuite utilisée pour cartographier le lactate et les lipides mobiles dans le cerveau de rat porteur d'un gliome. Une image spectroscopique 2D spatiales / 2D spectrales est obtenue en 64 min avec une résolution nominale de 1 ́1 mm et une épaisseur de coupe de 2 mm.
Author :Anne-Sophie von Bomhard Publisher :Oxford Centre for Maritime Archaeology ISBN 13 :9781905905232 Total Pages :0 pages Book Rating :4.9/5 (52 download)
Book Synopsis The Decree of Saïs by : Anne-Sophie von Bomhard
Download or read book The Decree of Saïs written by Anne-Sophie von Bomhard and published by Oxford Centre for Maritime Archaeology. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: von Bomhard presents an edition of the stela found during underwater excavations in the Abukir Bay, at the site of ancient Thonis-Heracleion, and inscribed with the Decree of Sais. The text is a parallel to that inscribed on another stela found at Naucratis at the turn of last century. The author gives an introduction to the discovery of the two stelae, as well as a description of the monuments, including the scenes and captions found in the lunette (Part II). von Bomhard goes on to discuss the arrangement of the texts and figures depicted on the decree, and the possible symbolism behind them. The bulk of the text is occupied by a careful transliteration and translation of the text, followed by an exhaustive bibliography, an index of words discussed, a synoptic overview of orthographic and figurative variations, and an index of Egyptian words. This is an important work that contributes to the understanding of royal benefactions to temples and aspects of trade and taxation systems in force at the time of the decree.
Book Synopsis Pathophysiology of Renal Disease by : Eberhard Ritz
Download or read book Pathophysiology of Renal Disease written by Eberhard Ritz and published by . This book was released on 1980 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fields Medallists' Lectures by : Michael Atiyah
Download or read book Fields Medallists' Lectures written by Michael Atiyah and published by World Scientific. This book was released on 1997-10-13 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the Fields Medal does not have the same public recognition as the Nobel Prizes, they share a similar intellectual standing. It is restricted to one field - that of mathematics - and an age limit of 40 has become an accepted tradition. Mathematics has in the main been interpreted as pure mathematics, and this is not so unreasonable since major contributions in some applied areas can be (and have been) recognized with Nobel Prizes. The restriction to 40 years is of marginal significance, since most mathematicians have made their mark long before this age.A list of Fields Medallists and their contributions provides a bird's eye view of mathematics over the past 60 years. It highlights the areas in which, at various times, greatest progress has been made. This volume does not pretend to be comprehensive, nor is it a historical document. On the other hand, it presents contributions from 22 Fields Medallists and so provides a highly interesting and varied picture.The contributions themselves represent the choice of the individual Medallists. In some cases the articles relate directly to the work for which the Fields Medals were awarded. In other cases new articles have been produced which relate to more current interests of the Medallists. This indicates that while Fields Medallists must be under 40 at the time of the award, their mathematical development goes well past this age. In fact the age limit of 40 was chosen so that young mathematicians would be encouraged in their future work.The Fields Medallists' Lectures is now available on CD-ROM. Sections can be accessed at the touch of a button, and similar topics grouped together using advanced keyword searches.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Book Synopsis The Concept and the Role of the Model in Mathematics and Natural and Social Sciences by : Hans Freudenthal
Download or read book The Concept and the Role of the Model in Mathematics and Natural and Social Sciences written by Hans Freudenthal and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Colloquium sponsored by the Division of Philosophy of Sciences of the International Union of History and Philosophy of Sciences organized at Utrecht, January 1960.
Book Synopsis Nuclear Physics of Stars by : Christian Iliadis
Download or read book Nuclear Physics of Stars written by Christian Iliadis and published by John Wiley & Sons. This book was released on 2015-04-13 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most elements are synthesized, or "cooked", by thermonuclear reactions in stars. The newly formed elements are released into the interstellar medium during a star's lifetime, and are subsequently incorporated into a new generation of stars, into the planets that form around the stars, and into the life forms that originate on the planets. Moreover, the energy we depend on for life originates from nuclear reactions that occur at the center of the Sun. Synthesis of the elements and nuclear energy production in stars are the topics of nuclear astrophysics, which is the subject of this book. It presents nuclear structure and reactions, thermonuclear reaction rates, experimental nuclear methods, and nucleosynthesis in detail. These topics are discussed in a coherent way, enabling the reader to grasp their interconnections intuitively. The book serves both as a textbook for advanced undergraduate and graduate students, with worked examples and end-of-chapter excercises, but also as a reference book for use by researchers working in the field of nuclear astrophysics.
Book Synopsis Ventricular Wall Motion by : Ulrich Sigwart
Download or read book Ventricular Wall Motion written by Ulrich Sigwart and published by Thieme-Stratton Corporation. This book was released on 1984 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Vladimir I︠A︡kovlevich Katkovnik Publisher :SPIE-International Society for Optical Engineering ISBN 13 : Total Pages :584 pages Book Rating :4.3/5 (91 download)
Book Synopsis Local Approximation Techniques in Signal and Image Processing by : Vladimir I︠A︡kovlevich Katkovnik
Download or read book Local Approximation Techniques in Signal and Image Processing written by Vladimir I︠A︡kovlevich Katkovnik and published by SPIE-International Society for Optical Engineering. This book was released on 2006 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with a wide class of novel and efficient adaptive signal processing techniques developed to restore signals from noisy and degraded observations. These signals include those acquired from still or video cameras, electron microscopes, radar, X-rays, or ultrasound devices, and are used for various purposes, including entertainment, medical, business, industrial, military, civil, security, and scientific. In many cases useful information and high quality must be extracted from the imaging. However, often raw signals are not directly suitable for this purpose and must be processed in some way. Such processing is called signal reconstruction. This book is devoted to a recent and original approach to signal reconstruction based on combining two independent ideas: local polynomial approximation and the intersection of confidence interval rule.
Book Synopsis Contrast-Enhanced MRI of the Breast by : Sylvia Heywang-Köbrunner
Download or read book Contrast-Enhanced MRI of the Breast written by Sylvia Heywang-Köbrunner and published by Springer. This book was released on 2011-10-08 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the first edition of Contrast-Enhanced MRI of the Breast was published in 1990, further progress has been made in the field and interest in magnetic resonance imaging (MRI) as an additional tool in the diagnosis of breast disease has increased. However, further questions have arisen concerning the best choice of technique, the most appropriate way to interpret MR images, and the role which MRI might play in the work-up of breast disease. In this edition we give an overview of the latest technical possibilities and present knowledge, which today is based on a much greater range of experience gained by various excellent research groups. It is our aim to help the interested reader in choosing an appropriate technique and in finding those applications which promise the greatest benefit for the patient. The particular advantages and limitations of MRI have been pointed out and the currently known capabilities and still existing limitations of other imaging modalities, including transcutaneous biopsy, discussed. Finally, a chapter concerning the use of MRI in the diagnosis of implant failure, a new situation, has been added. Acknowledgements. Since the first edition was published, much further work and research has been necessary. This would not have been possible without the continuous support of many colleagues, coworkers, and advisors.
Book Synopsis Perforator Flaps by : Phillip N. Blondeel
Download or read book Perforator Flaps written by Phillip N. Blondeel and published by CRC Press. This book was released on 2013-07-01 with total page 1519 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of Perforator Flaps: Anatomy, Technique, & Clinical Applications was a bestseller that sold out of its initial printing. This new edition has been updated to include ten new chapters and extensive updates on all existing chapters. Many new developments have taken place in the field, including the use of local perforator flaps, including free-style propeller flaps as well as the distal-based sural flap, which is effective for the lower extremity especially when microsurgical skills are unavailable. The editors, leading reconstructive surgeons and pioneers in the field of perforator flap surgery, have assembled a group of world-renowned experts who discuss perforator anatomy and clinical indications for the use of these flaps. The book outlines techniques for flap harvest, from the most basic to the highly advanced. Accompanying the book are four supplemental DVDs that demonstrate actual operating procedures.
