Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Conformal And Flexible Mri Radio Frequency Coils
Download Conformal And Flexible Mri Radio Frequency Coils full books in PDF, epub, and Kindle. Read online Conformal And Flexible Mri Radio Frequency Coils ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Conformal and Flexible MRI Radio Frequency Coils by : Bahareh Behzadnezhad
Download or read book Conformal and Flexible MRI Radio Frequency Coils written by Bahareh Behzadnezhad and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past few years there has been a move towards ultra-flexible coil technology which is more conformal to the human anatomy with highly decoupled elements. The benefit of using flexible radio frequency (RF) receive coils compared to rigid coils is stronger signal coupling by being closer to the patient. This results in achieving a higher signal-to-noise ratio in case of strong variations of the targeted anatomy across patients. Chapter 1 provides an overview and background in magnetic resonance imaging (MRI) physics, MRI system components, and different types of RF coils. Some of the previous work done in this area has been reviewed. Chapter 2 and 3 present the application of 3D-printing in making the supporting structure of conformal and application-specific RF coils. Dielectric properties of some common 3D-printing materials are characterized in chapter 3. Chapter 4 and 5 presents the development of flexible, light-weight MRI coils. Chapter 4 presents a flexible small blanket coil for imaging small field of view with high resolution such as extremities, breast, and pediatrics imaging. Chapter 5 discusses a flexible coil for foot and ankle imaging. Appendix A presents design and development of a traveling-wave Electron Paramagnetic Resonance (TW-EPR) spectrometer which was presented during the preliminary exam.
Book Synopsis RF Coils for MRI by : J. Thomas Vaughan
Download or read book RF Coils for MRI written by J. Thomas Vaughan and published by John Wiley & Sons. This book was released on 2012-12-19 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The content of this volume has been added to eMagRes (formerly Encyclopedia of Magnetic Resonance) - the ultimate online resource for NMR and MRI. To date there is no single reference aimed at teaching the art of applications guided coil design for use in MRI. This RF Coils for MRI handbook is intended to become this reference. Heretofore, much of the know-how of RF coil design is bottled up in various industry and academic laboratories around the world. Some of this information on coil technologies and applications techniques has been disseminated through the literature, while more of this knowledge has been withheld for competitive or proprietary advantage. Of the published works, the record of technology development is often incomplete and misleading, accurate referencing and attribution assignment being tantamount to admission of patent infringement in the commercial arena. Accordingly, the literature on RF coil design is fragmented and confusing. There are no texts and few courses offered to teach this material. Mastery of the art and science of RF coil design is perhaps best achieved through the learning that comes with a long career in the field at multiple places of employment...until now. RF Coils for MRI combines the lifetime understanding and expertise of many of the senior designers in the field into a single, practical training manual. It informs the engineer on part numbers and sources of component materials, equipment, engineering services and consulting to enable anyone with electronics bench experience to build, test and interface a coil. The handbook teaches the MR system user how to safely and successfully implement the coil for its intended application. The comprehensive articles also include information required by the scientist or physician to predict respective experiment or clinical performance of a coil for a variety of common applications. It is expected that RF Coils for MRI becomes an important resource for engineers, technicians, scientists, and physicians wanting to safely and successfully buy or build and use MR coils in the clinic or laboratory. Similarly, this guidebook provides teaching material for students, fellows and residents wanting to better understand the theory and operation of RF coils. Many of the articles have been written by the pioneers and developers of coils, arrays and probes, so this is all first hand information! The handbook serves as an expository guide for hands-on radiologists, radiographers, physicians, engineers, medical physicists, technologists, and for anyone with interests in building or selecting and using RF coils to achieve best clinical or experimental results. About EMR Handbooks / eMagRes Handbooks The Encyclopedia of Magnetic Resonance (up to 2012) and eMagRes (from 2013 onward) publish a wide range of online articles on all aspects of magnetic resonance in physics, chemistry, biology and medicine. The existence of this large number of articles, written by experts in various fields, is enabling the publication of a series of EMR Handbooks / eMagRes Handbooks on specific areas of NMR and MRI. The chapters of each of these handbooks will comprise a carefully chosen selection of articles from eMagRes. In consultation with the eMagRes Editorial Board, the EMR Handbooks / eMagRes Handbooks are coherently planned in advance by specially-selected Editors, and new articles are written (together with updates of some already existing articles) to give appropriate complete coverage. The handbooks are intended to be of value and interest to research students, postdoctoral fellows and other researchers learning about the scientific area in question and undertaking relevant experiments, whether in academia or industry. Have the content of this Handbook and the complete content of eMagRes at your fingertips! Visit: www.wileyonlinelibrary.com/ref/eMagRes View other eMagRes publications here
Book Synopsis A Flexible Coil Array for High Resolution Magnetic Resonance Imaging at 7 Tesla by : Roberta Kriegl
Download or read book A Flexible Coil Array for High Resolution Magnetic Resonance Imaging at 7 Tesla written by Roberta Kriegl and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic resonance imaging (MRI), among other imaging techniques, has become a major backbone of modern medical diagnostics. MRI enables the non-invasive combined, identification of anatomical structures, functional and chemical properties, especially in soft tissues. Nonetheless, applications requiring very high spatial and/or temporal resolution are often limited by the available signal-to-noise ratio (SNR) in MR experiments. Since first clinical applications, image quality in MRI has been constantly improved by applying one or several of the following strategies: increasing the static magnetic field strength, improvement of the radiofrequency (RF) detection system, development of specialized acquisition sequences and optimization of image reconstruction techniques. This work is concerned with the development of highly sensitive RF detection systems for biomedical ultra-high field MRI. In particular, auto-resonant RF coils based on transmission line technology are investigated. These resonators may be fabricated on flexible substrate which enables form-fitting of the RF detector to the target anatomy, leading to a significant SNR gain. The main objective of this work is the development of a flexible RF coil array for high-resolution MRI on a human whole-body 7 T MR scanner. With coil arrays, the intrinsically high SNR of small surface coils may be exploited for an extended field of view. Further, parallel imaging techniques are accessible with RF array technology, allowing acceleration of the image acquisition. Secondly, in this PhD project a novel design for transmission line resonators is developed, that brings an additional degree of freedom in geometric design and enables the fabrication of large multi-turn resonators for high field MR applications. This thesis describes the development, successful implementation and evaluation of novel, mechanically flexible RF devices by analytical and 3D electromagnetic simulations, in bench measurements and in MRI experiments.
Book Synopsis Radio Frequency Coils for Ultra-high Field Magnetic Resonance Imaging by : Daniel Lee
Download or read book Radio Frequency Coils for Ultra-high Field Magnetic Resonance Imaging written by Daniel Lee and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory and Design of Radio Frequency Coils in Magnetic Resonance Imaging by : Hiroyuki Fujita
Download or read book Theory and Design of Radio Frequency Coils in Magnetic Resonance Imaging written by Hiroyuki Fujita and published by . This book was released on 1998 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radio frequency coils for ultra-high field MRI by : Alexa (Alexa Angharad) Jones
Download or read book Radio frequency coils for ultra-high field MRI written by Alexa (Alexa Angharad) Jones and published by . This book was released on 2008 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Millimeter Scale Magnetic Field Manipulation in Magnetic Resonance Imaging Radio Frequency Coil and Magnetic Shielding Applications by : Siyuan Liu
Download or read book Millimeter Scale Magnetic Field Manipulation in Magnetic Resonance Imaging Radio Frequency Coil and Magnetic Shielding Applications written by Siyuan Liu and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic devices - components that generate, manipulate, or detect magnetic fields - are used in a variety of applications ranging from medical imaging to information transfer and sensing. The persisting motivation to miniaturize electronic devices drives a need to more effectively manipulate magnetic fields in the millimeter scale. In this dissertation, two areas are presented where miniaturization technology has been applied to create new or improved capability in the area of milliscale magnetics. For the first application, a radio frequency (RF) surface coil with a dimension that is comparable to the area of interest can maximize the signal-to-noise ratio (SNR) in Magnetic Resonance Imaging (MRI) application, allowing for higher quality images than available existing tools. This work demonstrates a miniature flexible coil that can be inserted into the body for high SNR pituitary gland MR imaging. It presents the spatial distributions of the image SNR of the 26-mm coil in both numerical simulation and agar gel phantom experiments. Compared to the commercial head coil, the miniature coil achieved up to a 19-fold SNR improvement within the region of interest, and the simulation matched the phantom experiment within an error of 1.1% 0.8%. Additionally, the coil performance was characterized with cadaver heads MRI scan using a 20-mm coil. A maximum of 16-fold and an average of 5-fold SNR improvement within the pituitary gland compared to the commercial head coil was obtained. The feasibility of using the miniature flexible coil for high-SNR pituitary MR imaging has been demonstrated, showing the potential for improved detection and characterization of pituitary gland microadenoma.In the second application, a novel way to shield the magnetic field of a single chip on a multi-chip-module is presented. This approach uses individual millimeter-size magnetic shield on each chip to reduce the chip-to-chip coupling effect of the circuits or influence on signal currents from local magnetic fields. Magnetic through silicon vias (mTSVs) were developed to help achieve the desired level of magnetic shielding. The microscale multilayer shields provided high efficiency shielding around arbitrary shapes and enabled fabrication of chip-scale shielding. This work focuses on the design and fabrication of the proposed magnetic shielding.
Book Synopsis Radiofrequency Coils for Ultra-high Field Body MRI. by : Sedig Farhat
Download or read book Radiofrequency Coils for Ultra-high Field Body MRI. written by Sedig Farhat and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radio Frequency Coils for Ultra-high Field Magnetic Resonance Imaging by : Shajan Gunamony
Download or read book Radio Frequency Coils for Ultra-high Field Magnetic Resonance Imaging written by Shajan Gunamony and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microstrip Radio-Frequency Coil and Array Design for Magnetic Resonance Imaging by : Bing Wu
Download or read book Microstrip Radio-Frequency Coil and Array Design for Magnetic Resonance Imaging written by Bing Wu and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Microstrip Radio-frequency Coil and Array Design for Magnetic Resonance Imaging" by Bing, Wu, 吳冰, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Microstrip Radio-frequency Coil and Array Design for Magnetic Resonance Imaging submitted by Wu Bing For the degree of Doctor of Philosophy at The University of Hong Kong in September 2006 In the past five years, microstrip RF coils have been developed and widely applied for MR applications at high magnetic fields. In contrast to conventional surface coils, the microstrip coil uses the microstrip transmission line which in its simplest form consists of a thin strip conductor and a ground plane separated by a low-loss dielectric substrate. The semi-open, unbalanced structure microstrip generates a unique B field distribution mainly on one side of the coil where a sample is located. This results in several unique features: reduced losses, higher Q- factor, reduced coupling among multiple microstrip coils. In addition, the microstrip RF coil's unbalanced nature obviates the need of a matching balun. This dissertation presents the author's investigates in microstrip RF coil and array designs at the fields higher than 1.5 Tesla. Firstly, a novel tunable loop microstrip (TLM) RF coil based on the ring resonant circuit has been presented. SNR comparison between the TLM coil and conventional surface coil has been performed at various magnetic field strengths from 1.5 Tesla to 11.1 Tesla. Our study has demonstrated that utilization of the TLM coil can substantially reduce radiation loss and deliver better SNR performance than a conventional coil at ultra high fields. Results also indicate a trend to superior performance of the TLM coil as the field increases. Secondly, several current decoupling techniques have been utilized to the TLM planar array, which consists of two identical TLM coils elements. Simulation, bench test and MRI experiments have been carried out to provide a quantitative analysis of those decoupling schemes. Thirdly, the commonly used capacitive decoupling method for microstrip arrays has been analyzed. It appears that the decoupling capacitance is usually quite small at ultra-high fields and difficult to finely tune. A capacitively decoupled TLM array has been proposed, fabricated and tested at 7 Tesla. Using the TLM array, the capacitive decoupling method can be easily applied with reasonable decoupling capacitance. Bench test and MRI experiments at 7 Tesla show that excellent isolations (-37 dB) between the adjacent elements can be achieved and this TLM array is appropriate for SENSE imaging. Lastly, a new inductive decoupling approach for microstrip arrays has been presented at fields higher than 7 Tesla. In contrast to the capacitive decoupling methods, the decoupling inductance is independent of the resonant frequency, making this method much easier to be implemented. An inductively decoupled eight- channel microstrip array has been implemented and tested at 9.4 Tesla. This decoupling approach should enable more elements to be packed into microstrip arrays for the purpose of parallel imaging at ultrahigh fields. Number of words: 425 Signature: DOI: 10.5353/th_b3704672 Subjects: Magnetic resonance imaging
Book Synopsis Entwurf eines Gesetzes zur Regelung der Verhältnisse der Fluss- und Binnenschiffahrt by :
Download or read book Entwurf eines Gesetzes zur Regelung der Verhältnisse der Fluss- und Binnenschiffahrt written by and published by . This book was released on 1869 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radiofrequency Coils for H- C MRI. by : S. James Wood
Download or read book Radiofrequency Coils for H- C MRI. written by S. James Wood and published by . This book was released on 2008 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Radio-frequency Coils for High-resolution Magnetic Resonance Imaging by : Julia Gasson
Download or read book Radio-frequency Coils for High-resolution Magnetic Resonance Imaging written by Julia Gasson and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anatomically Conforming Radio Frequency Coils for Magnetic Resonance Imaging and Spectroscopy by : William Edward BIMSON
Download or read book Anatomically Conforming Radio Frequency Coils for Magnetic Resonance Imaging and Spectroscopy written by William Edward BIMSON and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Novel Radiofrequency Coils for Hyperpolarized Magnetic Resonance Imaging by : Tony Zhou
Download or read book Development of Novel Radiofrequency Coils for Hyperpolarized Magnetic Resonance Imaging written by Tony Zhou and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis RF Coil Design for Multi-frequency Magnetic Resonance Imaging and Spectroscopy by : Arash Dabirzadeh
Download or read book RF Coil Design for Multi-frequency Magnetic Resonance Imaging and Spectroscopy written by Arash Dabirzadeh and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic Resonance Spectroscopy is known as a valuable diagnostic tool for physicians as well as a research tool for biochemists. In addition to hydrogen (which is the most abundant atom with nuclear magnetic resonance capability), other species (such as 31P or 13C) are used as well, to obtain certain information such as metabolite concentrations in neural or muscular tissues. However, this requires nuclear magnetic resonance (NMR) transmitter/receivers (coils) capable of operating at multiple frequencies, while maintaining a good performance at each frequency. The objective of this work is to discuss various design approaches used for second-nuclei RF (radio frequency) coils, and to analyze the performance of a particular design, which includes using inductor-capacitor (LC) trap circuits on a 31P coil. The method can be easily applied to other nuclei. The main advantage of this trapping method is the enabling design of second-nuclei coils that are insertable into standard proton coils, maintaining a near-optimum performance for both nuclei. This capability is particularly applicable as MRI field strengths increase and the use of specialized proton coils becomes more prevalent. A thorough performance analysis shows the benefit of this method over other designs, which usually impose a significant signal-to-noise (SNR) sacrifice on one of the nuclei. A methodology based on a modular coil configuration was implemented, which allowed for optimization of LC trap decoupling as well as performance analysis. The 31P coil was used in conjunction with various standard 1H coil configurations (surface/volume/array), using the trap design to overcome the coupling problem (degraded SNR performance) mentioned above. An analytical model was developed and guidelines on trap design were provided to help optimize sensitivity. The performance was analyzed with respect to the untrapped case, using RF bench measurements as well as data obtained from the NMR scanner. Insertability of this coil design was then verified by using it with general-purpose proton coils available. Phantoms were built to mimic the phosphorus content normally found in biologic tissues in order to verify applicability of this coil for in vivo studies. The contribution of this work lies in the quantification of general design parameters to enable "insertable" second-nuclei coils, in terms of the effects on SNR and resonance frequency of a given proton coil.
Book Synopsis Integrated PET/MR Imaging by : René Kartmann
Download or read book Integrated PET/MR Imaging written by René Kartmann and published by . This book was released on 2013 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
