The Extended Boundary Condition Method Approach for Electromagnetic Field Penetration Problems in Magnetic Resonance Imaging

The Extended Boundary Condition Method Approach for Electromagnetic Field Penetration Problems in Magnetic Resonance Imaging PDF Author: Rafael R. Canales Pastrana
Publisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 212

Get Book Here

Book Description

The Extended Boundary Condition Method Approach for Electromagnetic Field Penetration Problems in Magnetic Resonance Imaging

The Extended Boundary Condition Method Approach for Electromagnetic Field Penetration Problems in Magnetic Resonance Imaging PDF Author: Rafael R. Canales Pastrana
Publisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 212

Get Book Here

Book Description


Finite Element and Finite Difference Methods in Electromagnetic Scattering

Finite Element and Finite Difference Methods in Electromagnetic Scattering PDF Author: Michael A. Morgan
Publisher: Elsevier Science & Technology
ISBN:
Category : Electromagnetic theory
Languages : en
Pages : 408

Get Book Here

Book Description


Electromagnetic field near conducting half-space

Electromagnetic field near conducting half-space PDF Author: Yuriy Vasetsky
Publisher: Springer
ISBN: 9783031384226
Category : Technology & Engineering
Languages : en
Pages : 0

Get Book Here

Book Description
The book is devoted to the solution of one general problem of the theory of a three-dimensional quasi-stationary sinusoidal and pulse electromagnetic field. These studies, unlike many well-known works, are based on obtained exact analytical solution of the problem for the field, generated by external current sources near the conducting body with plane surface. The solution for the vector and scalar potentials, electric and magnetic intensities in the dielectric and conducting media is found without restrictions on the configuration of current sources, properties of the media and field frequency. Some general properties of field formation for arbitrary field in the considered system are obtained (in particular, full compensation by the field of the electric charge distributed on the interface between the media, the normal component of the induced external electric field and, accordingly, the equality to zero the components both of the current density and the electric field intensity perpendicular to the interface; the non-uniform electromagnetic field decreases in depth of conducting medium faster than uniform field). It is shown that the exact analytical solution depends on the values of the parameter proportional to the ratio of the field penetration depth to the distance between the external field sources and the body. The concept of strong skin effect is extended to the case of small value of the introduced parameter. A significant simplification of the expressions was obtained as an asymptotic expansion on this small parameter. In the case of pulsed fields approximate method gives the highest accuracy during important initial period of pulse time. For asymptotic expansion the approximate impedance boundary condition is generalized to the diffusion of non-uniform field into conducting medium. The book is intended for the researchers, postgraduate students and students specialized in theory and calculations of electromagnetic fields.

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports PDF Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456

Get Book Here

Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Wideband Solutions of Two-dimensional Electromagnetic Scattering Problems by Means of a Novel Combination of Finite Element Method (FEM) Or Extended Boundary Condition Method (EBCM) and Pade Approximation

Wideband Solutions of Two-dimensional Electromagnetic Scattering Problems by Means of a Novel Combination of Finite Element Method (FEM) Or Extended Boundary Condition Method (EBCM) and Pade Approximation PDF Author: Naser Ahmad Abu-Zaid
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 129

Get Book Here

Book Description


Electromagnetics in Magnetic Resonance Imaging

Electromagnetics in Magnetic Resonance Imaging PDF Author: Christopher M. Collins
Publisher: Morgan & Claypool Publishers
ISBN: 1681740834
Category : Medical
Languages : en
Pages : 82

Get Book Here

Book Description
In the past few decades, Magnetic Resonance Imaging (MRI) has become an indispensable tool in modern medicine, with MRI systems now available at every major hospital in the developed world. But for all its utility and prevalence, it is much less commonly understood and less readily explained than other common medical imaging techniques. Unlike optical, ultrasonic, X-ray (including CT), and nuclear medicine-based imaging, MRI does not rely primarily on simple transmission and/or reflection of energy, and the highest achievable resolution in MRI is orders of magnitude smaller that the smallest wavelength involved. In this book, MRI will be explained with emphasis on the magnetic fields required, their generation, their concomitant electric fields, the various interactions of all these fields with the subject being imaged, and the implications of these interactions to image quality and patient safety. Classical electromagnetics will be used to describe aspects from the fundamental phenomenon of nuclear precession through signal detection and MRI safety. Simple explanations and Illustrations combined with pertinent equations are designed to help the reader rapidly gain a fundamental understanding and an appreciation of this technology as it is used today, as well as ongoing advances that will increase its value in the future. Numerous references are included to facilitate further study with an emphasis on areas most directly related to electromagnetics.

The Spectral Domain Method in Electromagnetics

The Spectral Domain Method in Electromagnetics PDF Author: Craig Scott
Publisher: Artech House Publishers
ISBN:
Category : Science
Languages : en
Pages : 160

Get Book Here

Book Description
Presents an introduction to spectral domain techniques and illustrates their application to a variety of electromagnetic boundary value problems. An integrated approach to the solution of seemingly diverse problems is presented in order to show the underlying unity of solution. Complex problems can

Boundary Conditions in Electromagnetics

Boundary Conditions in Electromagnetics PDF Author: Ismo V. Lindell
Publisher: John Wiley & Sons
ISBN: 1119632366
Category : Science
Languages : en
Pages : 272

Get Book Here

Book Description
A comprehensive survey of boundary conditions as applied in antenna and microwave engineering, material physics, optics, and general electromagnetics research. Boundary conditions are essential for determining electromagnetic problems. Working with engineering problems, they provide analytic assistance in mathematical handling of electromagnetic structures, and offer synthetic help for designing new electromagnetic structures. Boundary Conditions in Electromagnetics describes the most-general boundary conditions restricted by linearity and locality, and analyzes basic plane-wave reflection and matching problems associated to a planar boundary in a simple-isotropic medium. This comprehensive text first introduces known special cases of particular familiar forms of boundary conditions — perfect electromagnetic conductor, impedance, and DB boundaries — and then examines various general forms of boundary conditions. Subsequent chapters discuss sesquilinear boundary conditions and practical computations on wave scattering by objects defined by various boundary conditions. The practical applications of less-common boundary conditions, such as for metamaterial and metasurface engineering, are referred to throughout the text. This book: Describes the mathematical analysis of fields associated to given boundary conditions Provides examples of how boundary conditions affect the scattering properties of a particle Contains ample in-chapter exercises and solutions, complete references, and a detailed index Includes appendices containing electromagnetic formulas, Gibbsian 3D dyadics, and four-dimensional formalism Boundary Conditions in Electromagnetics is an authoritative text for electrical engineers and physicists working in electromagnetics research, graduate or post-graduate students studying electromagnetics, and advanced readers interested in electromagnetic theory.

Magnetic Resonance Imaging

Magnetic Resonance Imaging PDF Author: Robert W. Brown
Publisher: John Wiley & Sons
ISBN: 0471720852
Category : Medical
Languages : en
Pages : 976

Get Book Here

Book Description
New edition explores contemporary MRI principles and practices Thoroughly revised, updated and expanded, the second edition of Magnetic Resonance Imaging: Physical Principles and Sequence Design remains the preeminent text in its field. Using consistent nomenclature and mathematical notations throughout all the chapters, this new edition carefully explains the physical principles of magnetic resonance imaging design and implementation. In addition, detailed figures and MR images enable readers to better grasp core concepts, methods, and applications. Magnetic Resonance Imaging, Second Edition begins with an introduction to fundamental principles, with coverage of magnetization, relaxation, quantum mechanics, signal detection and acquisition, Fourier imaging, image reconstruction, contrast, signal, and noise. The second part of the text explores MRI methods and applications, including fast imaging, water-fat separation, steady state gradient echo imaging, echo planar imaging, diffusion-weighted imaging, and induced magnetism. Lastly, the text discusses important hardware issues and parallel imaging. Readers familiar with the first edition will find much new material, including: New chapter dedicated to parallel imaging New sections examining off-resonance excitation principles, contrast optimization in fast steady-state incoherent imaging, and efficient lower-dimension analogues for discrete Fourier transforms in echo planar imaging applications Enhanced sections pertaining to Fourier transforms, filter effects on image resolution, and Bloch equation solutions when both rf pulse and slice select gradient fields are present Valuable improvements throughout with respect to equations, formulas, and text New and updated problems to test further the readers' grasp of core concepts Three appendices at the end of the text offer review material for basic electromagnetism and statistics as well as a list of acquisition parameters for the images in the book. Acclaimed by both students and instructors, the second edition of Magnetic Resonance Imaging offers the most comprehensive and approachable introduction to the physics and the applications of magnetic resonance imaging.

The Principles of Nuclear Magnetism

The Principles of Nuclear Magnetism PDF Author: A. Abragam
Publisher: Oxford University Press
ISBN: 9780198520146
Category : Science
Languages : en
Pages : 666

Get Book Here

Book Description
The Principles of Nuclear Magnetism