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| Author | : John Pauly |
| Publisher | : |
| Total Pages | : 392 |
| Release | : 1989 |
| Genre | : |
| ISBN | : |
| Author | : Saryu Singh |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 1991 |
| Genre | : |
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| Author | : Hichem Habib Garnaoui |
| Publisher | : |
| Total Pages | : 268 |
| Release | : 1994 |
| Genre | : |
| ISBN | : |
| Author | : Yinan Liu |
| Publisher | : |
| Total Pages | : |
| Release | : 2012 |
| Genre | : |
| ISBN | : |
Parallel excitation is an emerging technique to improve or accelerate multi-dimensional spatially selective excitations in magnetic resonance imaging (MRI) using multi-channel transmit arrays. The technique has potential in many applications, such as accelerating imaging speed, mitigating field inhomogeneity in high-field MRI, and alleviating the susceptibility artifact in functional MRI (fMRI). In these applications, controlling radiofrequency (RF) power deposition (quantified by Specific Absorption Rate, or SAR) under safe limit is a critical issue, particularly in high-field MRI. This \dissertation will start with a review of multidimensional spatially selective excitation in MRI and current parallel excitation techniques. Then it will present two new RF pulse design methods to achieve reduced local/global SAR for parallel excitation while preserving the time duration and excitation pattern quality. Simulations incorporating human-model based tissue density and dielectric property were performed. Results have show that the proposed methods can achieve significant SAR reductions without enlonging the pulse duration at high-fields.
| Author | : Marinus T. Vlaardingerbroek |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 526 |
| Release | : 2003 |
| Genre | : Mathematics |
| ISBN | : 9783540436812 |
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.
| Author | : Robert W. Brown |
| Publisher | : John Wiley & Sons |
| Total Pages | : 976 |
| Release | : 2014-05-02 |
| Genre | : Medical |
| ISBN | : 1118633970 |
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.
| Author | : P Mansfield |
| Publisher | : Elsevier |
| Total Pages | : 365 |
| Release | : 1982-04-28 |
| Genre | : Science |
| ISBN | : 0323154069 |
NMR Imaging in Biomedicine: Advances in Magnetic Resonance discusses significant advances in NMR imaging and its application to the field of biomedicine. This book is organized into 10 chapters that cover the classification, methods, imaging regimes, and the potential use of NMR imaging in medicine. After discussing the basic theoretical ideas of NMR and its application to NMR imaging, this book presents mathematical analyses of the various NMR techniques, focusing primarily on the comparison in terms of imaging speed and data-acquisition rate. It also covers a number of practical ranges or imaging regimes in terms of sensitivity, sample size, and operating frequency. Significant topics on potential application of NMR imaging in medicine, apparatus requirements in the instrumentation of NMR imaging machines, and the principles of biomagnetic effects are discussed in other chapters. The considered biomagnetic effects are categorized into three main groups: the effects of static magnetic fields, the effects of relatively slow varying time-dependent fields, and radio-frequency magnetic fields. This book is of great value to radiologists, medical physicists, neuroradiologists, anatomists, physiologists, and postgraduate students of NMR imaging.
| Author | : G A Webb |
| Publisher | : Royal Society of Chemistry |
| Total Pages | : 587 |
| Release | : 2007-10-31 |
| Genre | : Science |
| ISBN | : 1847555233 |
As a spectroscopic method, nuclear magnetic resonance (NMR) has seen spectacular growth, both as a technique and in its applications. Today's applications of NMR span a wide range of scientific disciplines, from physics to biology to medicine. Each volume of Nuclear Magnetic Resonance comprises a combination of annual and biennial reports which together provide comprehensive coverage of the literature on this topic. This Specialist Periodical Report reflects the growing volume of published work involving NMR techniques and applications, in particular NMR of natural macromolecules, which is covered in two reports: NMR of Proteins and Nucleic Acids; and NMR of Carbohydrates, Lipids and Membranes. For those wanting to become rapidly acquainted with specific areas of NMR, Nuclear Magnetic Resonance provides unrivalled scope of coverage. Seasoned practitioners of NMR will find this an invaluable source of current methods and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading experts in their specialist fields, this series is designed to help the chemistry community keep current with the latest developments in their field. Each volume in the series is published either annually or biennially and is a superb reference point for researchers. www.rsc.org/spr
| Author | : Atsushi Mark Takahashi |
| Publisher | : |
| Total Pages | : 338 |
| Release | : 1995 |
| Genre | : |
| ISBN | : |
"The correction of spiral image reconstruction algorithms to compensate for k-space trajectory distortion was also demonstrated theoretically and experimentally." --
| Author | : Hong Yan |
| Publisher | : |
| Total Pages | : |
| Release | : 1989 |
| Genre | : |
| ISBN | : |
