Novel Radio Frequency Resonators for in Vivo Magnetic Resonance Imaging and Spectroscopy at Very High Magnetic Fields PDF Download
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Author: Xiaoliang Zhang
Publisher:
ISBN:
Category : Magnetic resonance imaging
Languages : en
Pages : 560
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Book Description
Author: Xiaoliang Zhang
Publisher:
ISBN:
Category : Magnetic resonance imaging
Languages : en
Pages : 560
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Book Description
Author: Gangchea Lee
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Magnetic resonance imaging (MRI) is one of the major medical imaging diagnostic tool in todays daily clinical routine. This technique produces either two-dimensional (2D) or three-dimensional (3D) images with high resolution and contrast predominantly in soft tissues non-invasively, therefore, providing physiological information that other imaging modality cannot offer. The quality of a MRI image often depends on the signal to noise ratio (SNR), and the high SNR can be sacrificed to achieve either higher resolutions or shorter acquisition times. Therefore, MR research is striving for the highest achievable SNR in the images. There are two major ways to achieve higher SNR: 1) the use of higher static magnetic fields (B0), or 2) the use of optimized radiofrequency (RF) resonator for the image acquisition. However, the optimization of RF resonators at higher B0 becomes harder as the working frequency of the RF resonator increases proportional to B0 (radiation losses, lumped element losses, coil to cable interactions, low quality factors, and dielectric effect becomes problematic at high frequencies).This dissertation describes conventional RF resonator designs and new concepts of RF resonators at a very high magnetic field of 14.1 T. Proton MRI will be conducted on selected biological applications requiring the RF resonator to operate at 600 MHz. The fabrication of conventional coils a surface coil, a birdcage coil, and scroll coils is described in the earlier chapters (chapter 2, 3, 4). These coils were fabricated to image the mouse eye in vivo, the mouse brain in vivo, and fixed 3D printed cell strands respectively. Simultaneous imaging concept is also elaborated in chapter 4. In the later chapters (chapter 5, 6), two unconventional design RF resonators a dielectric resonator, and a patch antenna were fabricated, tested, and compared with state of the art RF resonators to investigate the possibility of substituting the conventional RF resonators. These two designs provided higher homogeneity but less SNRs. Therefore, improvements to be made to increase SNR are discussed in each chapter.
Author: David Otto Brunner
Publisher:
ISBN:
Category :
Languages : en
Pages : 165
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Author: Lawrence J. Berliner
Publisher: Springer Nature
ISBN: 303047318X
Category : Science
Languages : en
Pages : 237
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This book describes the methods of analysis and determination of oxidants and oxidative stress in biological systems. Reviews and protocols on select methods of analysis of ROS, RNS, oxygen, redox status, and oxidative stress in biological systems are described in detail. It is an essential resource for both novices and experts in the field of oxidant and oxidative stress biology.
Author: Anca Irina Stefan
Publisher:
ISBN:
Category : Cavity resonators
Languages : en
Pages : 120
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Abstract: The purpose of this work was to use computer-aided design methods to analyze resonant cavities for electron paramagnetic resonance (EPR) and magnetic resonance (MR) imaging. As a result of this analysis, a new design and modifications to existing ones were proposed. The behavior of a L-band transverse electric reentrant resonator (TERR) for in-vivo EPR spectroscopy and imaging was analyzed. The influence of various geometrical parameters on the B1 field distribution was investigated. The optimal size of a sample that can be imaged with this type of resonator was determined, as well as the dependence of the quality factor on the sample size and geometry. Some of the numerical results were compared with experimental data. Finally, a design for a 300 MHz TERR was proposed. In the second part of this work, numerical studies using a model of a 16-strut transverse electromagnetic (TEM) resonator for MR imaging were performed. Simulations were performed either with a saline-filled spherical phantom or with a 4-mm resolution head model. The purpose was to investigate ways to improve the B1 homogeneity, obtain localized imaging, and explore the potential use of the first mode of the TEM structure. Models of TEM structures with reduced number of struts to allow for better patient access were designed. The effect of partially filling the TEM resonator with high dielectric constant material on the field homogeneity was analyzed.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 776
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Author: G. A. Webb
Publisher: Royal Society of Chemistry
ISBN: 0854043624
Category : Medical
Languages : en
Pages : 419
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Book Description
Annotation As a spectroscopic method, Nuclear Magnetic Resonance (NMR) has seen spectacular growth over the past two decades, both as a technique and in its applications. Today the 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. For those wanting to become rapidly acquainted with specific areas of NMR, this title provides unrivalled scope of coverage. Seasoned practitioners of NMR will find this an invaluable source of current methods and applications. Each volume of Nuclear Magnetic Resonance comprises a combination of annual and biennial reports which together provide comprehensive 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 Acids" and "NMR of Carbohydrates, Lipids and Membranes". For those wanting to become rapidly acquainted with specific areas of NMR, this title provides unrivalled scope of coverage. Seasoned practitioners of NMR will find this an in valuable 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 authorities in the relevant subject areas, the series creates a unique service for the active research chemist, with regular, in-depth accounts of progress in particular fields of chemistry. Subject coverage within different volumes of a given title is similar and publication is on an annual or biennial basis.
Author: Sven Junge
Publisher:
ISBN:
Category :
Languages : de
Pages : 266
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Author: Gene Bogdanov
Publisher:
ISBN:
Category : Magnetic resonance imaging
Languages : en
Pages : 404
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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