Počet záznamů: 1
Electromagnetics in magnetic resonance imaging
Údaje o názvu Electromagnetics in magnetic resonance imaging : physical principles, related applications, and ongoing developments / Christopher M. Collins. [elektronický zdroj] Nakladatel San Rafael [California] (40 Oak Drive, San Rafael, CA, 94903, USA) : Morgan & Claypool Publishers, [2016] Distributor Bristol [England] (Temple Circus, Temple Way, Bristol BS1 6HG, UK) : IOP Publishing, [2016] Fyz.popis 1 online resource (various pagings) : illustrations (some color). ISBN 9781681740836 (online) 9781681742113 mobi Edice [IOP release 2] IOP concise physics, ISSN 2053-2571 Poznámka "Version: 20160301"--Title page verso. "A Morgan & Claypool publication as part of IOP Concise Physics"--Title page verso. Poznámky o skryté bibliografii a rejstřících Includes bibliographical references. Úplný obsah Preface -- 1. Fundamentals of MRI--fields and basic pulse sequences -- 1.1. Proportionality of net nuclear magnetization to static magnetic field strength, B0 -- 1.2. Classical description of nuclear precession -- 1.3. Manipulating M in a static B0 field with an RF (B1) pulse -- 1.4. Free induction decay -- 1.5. Slice-selective excitation -- 1.6. Encoding spatial information into the net magnetization -- 1.7. Introduction to k-space for simple image acquisition and reconstruction -- 1.8. Imaging slices with arbitrary orientations and 3D volumes -- 1.9. Basic image contrast: proton density, T1, and T2 weighted spin echo images Poznámka o obsahu 2. Fundamentals of signal-to-noise ratio (SNR) -- 2.1. Signal strength as a function of static and RF magnetic fields -- 2.2. Noise and intrinsic SNR -- 2.3. Quantitative calculation of SNR from electromagnetic fields -- 2.4. Effects of image sequence parameters on SNR -- 2.5. Array reception. 3. Fields and hardware for MRI -- 3.1. Static magnetic (B0) fields -- 3.2. Switched gradient magnetic fields -- 3.3. RF magnetic (B1) fields. 4. Tissue/field interactions, MRI safety, and field-related image artifacts -- 4.1. Interactions between fields in MRI and biological tissue -- 4.2. Interactions between fields in MRI and ferromagnetic and conductive materials -- 4.3. Safety and biological effects of static, switched, and RF magnetic fields in MRI -- 4.4. Some field-related image artifacts in MRI and basic methods for their reduction. 5. MRI-based measurement of field distributions and tissue heating -- 5.1. Mapping the static magnetic field distribution -- 5.2. Mapping RF magnetic fields -- 5.3. Mapping RF-induced heating. 6. Recent and ongoing developments -- 6.1. Parallel imaging -- 6.2. Transmit coil arrays -- 6.3. Gradient field monitoring -- 6.4. High-permittivity materials and meta-materials for manipulating RF fields in MRI -- 6.5. MR fingerprinting -- 6.6. Measurement of tissue electromagnetic properties -- 7. Conclusion. Poznámky k dostupnosti Přístup pouze pro oprávněné uživatele Určeno pro Medical imaging researchers, engineers and scientists. Poznámky Způsob přístupu: World Wide Web.. Požadavky na systém: Adobe Acrobat Reader. Dal.odpovědnost Morgan & Claypool Publishers, Institute of Physics (Great Britain), Předmět.hesla Magnetic resonance imaging. * Electromagnetic theory. * Nuclear magnetic resonance (NMR/MRI). * MEDICAL / Radiology, Radiotherapy & Nuclear Medicine. MeSH Magnetic Resonance Imaging. Forma, žánr elektronické knihy electronic books Země vyd. Kalifornie Jazyk dok. angličtina Druh dok. Elektronické knihy URL Plný text pro studenty a zaměstnance UPOL 
kniha
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.
Preface -- 1. Fundamentals of MRI--fields and basic pulse sequences -- 1.1. Proportionality of net nuclear magnetization to static magnetic field strength, B0 -- 1.2. Classical description of nuclear precession -- 1.3. Manipulating M in a static B0 field with an RF (B1) pulse -- 1.4. Free induction decay -- 1.5. Slice-selective excitation -- 1.6. Encoding spatial information into the net magnetization -- 1.7. Introduction to k-space for simple image acquisition and reconstruction -- 1.8. Imaging slices with arbitrary orientations and 3D volumes -- 1.9. Basic image contrast: proton density, T1, and T2 weighted spin echo images2. Fundamentals of signal-to-noise ratio (SNR) -- 2.1. Signal strength as a function of static and RF magnetic fields -- 2.2. Noise and intrinsic SNR -- 2.3. Quantitative calculation of SNR from electromagnetic fields -- 2.4. Effects of image sequence parameters on SNR -- 2.5. Array reception3. Fields and hardware for MRI -- 3.1. Static magnetic (B0) fields -- 3.2. Switched gradient magnetic fields -- 3.3. RF magnetic (B1) fields4. Tissue/field interactions, MRI safety, and field-related image artifacts -- 4.1. Interactions between fields in MRI and biological tissue -- 4.2. Interactions between fields in MRI and ferromagnetic and conductive materials -- 4.3. Safety and biological effects of static, switched, and RF magnetic fields in MRI -- 4.4. Some field-related image artifacts in MRI and basic methods for their reduction5. MRI-based measurement of field distributions and tissue heating -- 5.1. Mapping the static magnetic field distribution -- 5.2. Mapping RF magnetic fields -- 5.3. Mapping RF-induced heating6. Recent and ongoing developments -- 6.1. Parallel imaging -- 6.2. Transmit coil arrays -- 6.3. Gradient field monitoring -- 6.4. High-permittivity materials and meta-materials for manipulating RF fields in MRI -- 6.5. MR fingerprinting -- 6.6. Measurement of tissue electromagnetic properties -- 7. Conclusion.
Počet záznamů: 1