Download or read book Imagerie par r sonance magn tique written by Robert Sigal and published by . This book was released on 1988 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce livre est une introduction A "l'Imagerie par rA(c)sonance " "magnA(c)tique" destinA(c)e aux radiologues, cliniciens, A(c)tudiants et manipulateurs qui souhaitent comprendre par eux-mAames les rA(c)sultats des examens IRM, mais aussi la littA(c)rature de plus abondante qui est consacrA(c)e A cette nouvelle technique d'imagerie. Il ne suppose de la part du lecteur aucune connaissance en physique ou mathA(c)matique. Le livre comprend cinq parties: introduction, paramA]tres tissulaires et d'acquisition, contribution diagnostique, conduite pratique d'un examen IRM. Huit exercices permettent ensuite aux lecteurs de tester leur acquit. La question de la localisation du signal et des artA(c)facts est envisagA(c)e dans un appendice. Comportant prA]s de 200 illlustrations et figures, ce livre se veut avant tout pA(c)dagogique: il doit permettre aux lecteurs de commencer A interprA(c)ter, et mAame A conduire un examen IRM.

Download or read book A Primer Of Magnetic Resonance Imaging written by Jacek W Hennel and published by World Scientific. This book was released on 1998-01-22 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is concerned with imaging of the interior of the human body using signals originating from magnetic moments of hydrogen nuclei and detected using a technique known as magnetic resonance. It explains the method and gives examples of applications.The book is addressed to those who would like to understand the principle of the method exactly, but do not have university training in physics and mathematics. It will therefore be very useful to medical practitioners and researchers, radiologists, and auxiliary workers in the health service.

Download or read book Magnetic Resonance Imaging written by Marinus T. Vlaardingerbroek and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents an overall analytical treatment of MRI physics and engineering. Special attention is paid to the treatment of intrinsic artefacts of the different sequences which can be described for the different scan methods. The book contains many images, especially showing specific properties of the different scan methods. The methods discussed include RARE, GRASE, EPI and Spiral Scan. The 3rd edition deals with stranger gradient and new RF coil systems, and sequences such as Balanced FFE and q-space diffusion imaging and SENSE.

Download or read book Imagerie par r sonance magn tique Principe recherche et pistes de d veloppement pour l Afrique written by Samuel Mbozo'o Mvondo and published by GRIN Verlag. This book was released on 2023-07-11 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seminar paper de l’année 2023 dans le domaine Medecine - Médecine générale, note: 16, Université de Yaoundé I (Faculty of Medicine an Biomedical sciences), cours: Medical Imaging, langue: Français, résumé: Les parties suivants sont abordées dans ce document: - les bases physiques et mathématiques de l'IRM, nous expliquerons le phénomène de RMN, le codage spatial, la transformée de Fourier et les paramètres du signal. - Les principaux composants d'un appareil d'IRM, nous présenterons l'aimant principal, les bobines de gradient, l'antenne d'émission-réception, l'ordinateur et l'écran. - Les différentes séquences IRM et leurs caractéristiques, nous distinguerons les séquences écho de spin et écho de gradient, les techniques d'accélération, les méthodes de préparation de l'aimantation et les séquences spécifiques à certains organes ou pathologies. - Les produits de contraste en IRM et leurs effets sur le signal, nous classerons les produits selon leur mécanisme d'action (paramagnétique, superparamagnétique, transfert d'aimantation, perfusion) et leurs indications. - Le risque et de la sécurité en IRM, nous identifierons les sources potentielles d'artefacts ou de complications liées aux champs magnétiques ou aux produits de contraste. Elle propose également des solutions pour corriger ou minimiser ces effets indésirables. Nous terminerons en proposant des axes de recherches en imagerie par résonance magnétique et en présentant le développement d’une technologie IRM plus accessible pour l’Afrique.

Download or read book Aspects relatifs l intensit du champ magn tique en imagerie par r sonance magn tique IRM written by Marshall, Deborah and published by . This book was released on 1993 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Imagerie de r sonance magn tique 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.

Download or read book Les art facts de champ magn tique en imagerie par r sonance magn tique nucl aire I R M written by Stéphane Beaumont and published by . This book was released on 1993 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL EST CONSACRE A L'ETUDE DES ARTEFACTS DE CHAMP MAGNETIQUE EN IMAGERIE PAR RESONANCE MAGNETIQUE (I.R.M.), LE BUT ETANT DE PROPOSER DES CONDITIONS D'EXAMEN SUSCEPTIBLES DE MINIMISER DE TELS ARTEFACTS ET DE DEVELOPPER UNE TECHNIQUE DE TRAITEMENT D'IMAGE PERMETTANT DE LES EFFACER. AINSI L'AUTEUR S'INTERESSE AU MECANISME DE RECONSTRUCTION DE L'IMAGE EN PRESENCE DE PERTURBATIONS MAGNETIQUES INTRINSEQUES A L'APPAREIL D'IMAGERIE OU BIEN INDUITES PAR L'OBJET LUI-MEME. IL VALIDE LES HYPOTHESES EMISES CONCERNANT CES MECANISMES EN METTANT AU POINT, A PARTIR DE CES CONCEPTS, UNE TECHNIQUE DE SIMULATION INFORMATIQUE DES IMAGES PAR RESONANCE MAGNETIQUE DE CERTAINS OBJETS TEST ET EN CONFRONTANT CES IMAGES SIMULEES AVEC DES IMAGES OBTENUES EXPERIMENTALEMENT. CES CALCULS NECESSITENT AU PREALABLE DE DETERMINER DES EXPRESSIONS DES CHAMPS MAGNETIQUES LOCAUX INDUITS PAR CES OBJETS. L'ENSEMBLE DE CES RESULTATS EST APPLIQUE: 1) DANS UN PREMIER TEMPS, A L'ETUDE PAR I.R.M. DES ENDOPROTHESES VASCULAIRES QUI, DE PAR LEUR CARACTERE FERROMAGNETIQUE, ENGENDRENT CE TYPE D'ARTEFACT. L'AUTEUR DEFINIT LES CONDITIONS OPTIMALES D'EXAMEN I.R.M. EN PRESENCE DE CE TYPE D'IMPLANTS METALLIQUES: ORIENTATION DE L'IMPLANT PAR RAPPORT AUX DIRECTIONS DU GRADIENT DE LECTURE ET DU CHAMP MAGNETIQUE PRINCIPAL; RECHERCHE DES INTENSITES OPTIMALES POUR LES GRADIENTS DE CHAMP MAGNETIQUE NECESSAIRES A LA RECONSTRUCTION DE L'IMAGE; CHOIX DE LA SEQUENCE D'IMPULSIONS ET DU TYPE DE COUPE LES PLUS FAVORABLES. 2) ET DANS UN SECOND TEMPS, A LA MISE AU POINT D'UNE METHODE DE MESURE DE LA SUSCEPTIBILITE MAGNETIQUE DES MATERIAUX PAR I.R.M. CETTE METHODE SEMBLE DONNER DE BONS RESULTATS POUR DES SUBSTANCES PARAMAGNETIQUES OU FAIBLEMENT FERROMAGNETIQUES

Download or read book Imagerie Par Resonance Magnetique current Problems In Neurology S written by and published by . This book was released on 1988 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Image Processing in Magnetic Resonance Imaging written by Luigi Landini and published by CRC Press. This book was released on 2005-09-13 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: The popularity of magnetic resonance (MR) imaging in medicine is no mystery: it is non-invasive, it produces high quality structural and functional image data, and it is very versatile and flexible. Research into MR technology is advancing at a blistering pace, and modern engineers must keep up with the latest developments. This is only possible with a firm grounding in the basic principles of MR, and Advanced Image Processing in Magnetic Resonance Imaging solidly integrates this foundational knowledge with the latest advances in the field. Beginning with the basics of signal and image generation and reconstruction, the book covers in detail the signal processing techniques and algorithms, filtering techniques for MR images, quantitative analysis including image registration and integration of EEG and MEG techniques with MR, and MR spectroscopy techniques. The final section of the book explores functional MRI (fMRI) in detail, discussing fundamentals and advanced exploratory data analysis, Bayesian inference, and nonlinear analysis. Many of the results presented in the book are derived from the contributors' own work, imparting highly practical experience through experimental and numerical methods. Contributed by international experts at the forefront of the field, Advanced Image Processing in Magnetic Resonance Imaging is an indispensable guide for anyone interested in further advancing the technology and capabilities of MR imaging.

Download or read book Basics of Magnetic Resonance Imaging written by William Oldendorf and published by . This book was released on 2014-01-15 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Magnetic Resonance Imaging written by Jintong Mao and published by Independently Published. This book was released on 2019-10-25 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is in black and white printing. It was revised on 05/30/2020. Starting from complex free induction decay (FID), this book establishes a logical framework for the discussion of the principles of MRI. Based on the framework, traditional topics and some new topics are described in detail. Every formula is derived step by step at length. Essence of MRI is thoroughly discussed. It is emphasized that Fourier transform (FT) in MRI is a natural result from data acquisition if with a linear field gradient. Each concept, particularly the concept of echo, is explained in detail. For example, it is indicated that the popular drawing of an echo following a single FID (note this "single") in time axis is misleading in MRI (but may not in NMR). An echo cannot be considered as two back to back FID, etc. If you cannot accept these statements immediately, you may need to refresh your basic knowledge of MRI. The procedure from FID to MR image is accomplished by a pair of FT. The first FT is established naturally and automatically from echo acquisition. Analog digital converter leads to discrete FID. Using Nyquist sampling and quadrature phase sensitive detection (PSD), formula FOV*dk = 2pi is derived. From FOV*dk=2pi, discrete FT is derived by the summation of discrete FID directly, without relying on continuous FT. Thus, discrete FID leads to discrete FT. On other side, a discrete echo is the summation of acquired discrete FID, if re-phasing linear gradient field follows de-phasing gradient field. Thus, discrete FID also leads to discrete echo. We have the result that the discrete echo is a discrete FT (one dimensional). A series of echoes is obtained by phase encoding (raw data in two-dimensional k-space). The k-space, therefore, is a two-dimensional discrete FT (first FT). The reconstructed image is obtained by applying inverse FT (second FT) to the series of discrete echoes (k-space). Continuous FT is used as a heuristic step. But it is not necessary for the discussion of MRI. As example from FID to MR image, simulated images are obtained for graphical phantoms by using MATLAB. In appendix, MATLAB codes for image reconstruction and for some frequency selective pulses are included. Based on the framework, the topics include basic pulse sequences; pulse train; image contrasts; signal to noise ratio; ringing artifacts; aliasing artifacts; improvement of slice profile of selective pulses (Bloch equation is solved numerically using Runge-Kutta method); fat suppression; magnetization transfer; diffusion; flow image; functional MRI (fMRI for a perceptual alternation is presented), etc. Inside of the framework, emphasized topics include pulsatile ghost artifact for flow that is simulated by MATLAB and explained by interleaved zero data in k-space; experiments show that traditional explanation of flow mis-registration is not correct; the experiment also shows that the profile of laminar flow looks like a long needle, instead of ellipsoid; Stejskal-Tanner formula for b-value can be obtained by a wrong derivation, thus, the correctness of the formula may be in question; the strength of refocusing gradient for 90d selective pulse is-0.515, instead of commonly used -0.5 (small difference in refocusing strength leads to a large difference in refocusing effects due to non-linearity of Bloch equation); etc. In addition to above topics, Bloch equation with the terms T1, T2, diffusion, flow, etc. is derived by adding independent contributions to dM/dt with the assumption that T2 functions only in x-y plane. It is the hope this book is readable. It is the hope that the journey through the book might be a joy. This book will be of value to beginners. Perhaps it is valuable to a more extensive readership as well.

Download or read book Recent Developments in Magnetic Resonance Imaging written by Zachary Garcia and published by American Medical Publishers. This book was released on 2021-11-16 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Resonance Imaging (MRI) is a technique used in radiology. It is used in forming the pictures of the anatomy and the physiological processes of the body. MRI uses magnetic field gradients, strong magnetic fields and radio waves to generate an image of the organs in the body. Magnetic resonance imaging is different from a CT scan and PET scan as it does not involve X-rays and ionizing radiation. MRI is primarily used for medical diagnosis, staging of disease and monitoring without exposing the body to radiation. The major components of an MRI scanner are the main magnet, gradient system and shim coils. Main magnet is used to polarize the sample, whereas MR signal and the RF system are localized by the gradient system. Shim coils are the components used for correcting shifts in the homogeneity of the main magnetic field. This book provides comprehensive insights into the field of magnetic resonance imaging. It is a valuable compilation of topics, ranging from the basic to the most complex advancements in this field. This book is a vital tool for all researching and studying medical imaging.

Download or read book Manuel de techniques de l imagerie par r sonance magn tique written by Gabriel Korach and published by FeniXX. This book was released on 1991-12-31T23:00:00+01:00 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'IRM est devenue un outil diagnostique indispensable, qui exige des connaissances en physique - sinon en mathématique - pour une pratique intelligente des examens. La première partie de ce manuel propose cette initiation théorique, indispensable à la compréhension de l'IRM : notion de magnétisme, phénomène de résonance magnétique, propriétés du signal, séquences d'excitation, formation du contraste, construction des images, artefacts, facteurs de qualité des images. Les chapitres suivants apportent des éléments de technologie, concernant l'appareillage, sa maintenance, ses règles de fonctionnement. La seconde partie est consacrée à la pratique des examens des différents organes : systèmes nerveux, voies aérodigestives, rachis, os et articulations, thorax, abdomen, ainsi qu'à l'angiographie et la stéréotaxie. Pour chaque organe, les techniques et les résultats sont présentés selon un schéma identique : tableau résumant les informations utiles à la pratique de l'examen (position du patient, choix de l'antenne, orientation des différentes séries de coupes, pondération des séquences, dimensions du champ d'exploration...) ; réalisation de l'examen ; topogramme des coupes ; difficultés rencontrées ; enfin, des exemples d'images réalisées selon les coupes et séquences proposées, avec repérage des principaux éléments anatomiques et description des signaux. Un glossaire donne une définition des termes anglais et français utilisés. Cet ouvrage s'adresse aux élèves des écoles de techniciens de radiologie, aux manipulateurs confirmés, aux étudiants en médecine en cours de spécialisation, et aux médecins voulant se familiariser avec cette technique d'imagerie. Il se propose d'être également un outil de travail quotidien.

Download or read book Manual of Clinical Magnetic Resonance Imaging written by Jay P. Heiken and published by . This book was released on 1986 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introduction to Functional Magnetic Resonance Imaging CD ROM written by Richard B. Buxton and published by Cambridge University Press. This book was released on 2002-03-25 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Introduction to Functional Magnetic Resonance Imaging is an invaluable introduction to how fMRI works, from basic principles and underlying physics and physiology, to newer techniques such as arterial spin labeling and diffusion tensor imaging. The supplementary CD-ROM contains all the figures from the book as PowerPoint files, together with movies of cross-sectional anatomical MR images and a library of all the MR images used in the movies as individual Tiff files. As a resource for teachers and researchers, this combination of text and dual platform CD is unsurpassed.

Download or read book Magnetic Particle Imaging written by Tobias Knopp and published by Springer. This book was released on 2012-05-09 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a comprehensive overview of recent developments in magnetic particle imaging (MPI), a novel imaging modality. Using various static and oscillating magnetic fields, and tracer materials made from iron oxide nanoparticles, MPI can perform background-free measurements of the particles’ local concentration. The method exploits the nonlinear remagnetization behavior of the particles and has the potential to surpass current methods for the detection of iron oxide in terms of sensitivity and spatiotemporal resolution. Starting from an introduction to the technology, the topics addressed include setting up an imaging device, assessment of image quality, development of new MPI tracer materials, and the first preclinical results. This is the first book to be published on magnetic particle imaging, and it will be an invaluable source of information for everyone with an interest in this exciting new modality.

Download or read book Imagerie m dicale base de champ magn tique et d ultrasons written by André Briguet and published by . This book was released on 2014-04-09 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: