Download or read book Development of Frequency Adjustable Magnetic Field Probes for Magnetic Resonance Systems written by Niklas Wehkamp and published by . This book was released on 2022* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Magnetic Near field Probes written by Frank M. Greene and published by . This book was released on 1975 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frequency adjustable Magnetic Field Probes written by Niklas Wehkamp and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Purpose Nuclear Magnetic Resonance field probes provide exciting possibilities for enhancing MR image quality by allowing for calibration of k-space trajectories and/or dynamic measurement of local field changes. The purpose of this study is to design and build field probes, which are easier to manufacture and more flexible to use than existing probes. Methods A new manufacturing method is presented based on light-activated resin to encase the coil assembly and the 1H sample. This method allows for realizing field probes with tightly integrated orthogonal coils, whereby the local resonance frequency of protons can be adjusted during the MR experiment, by applying a DC current to the integrated urn:x-wiley:07403194:media:mrm28444:mrm28444-math-0001-field modification coil. Results The apparent field probe position in a gradient echo experiment was shifted within the field of view by changing its Larmor frequency using an integrated micro-coil with 5.5 windings. The measured frequency modulation induced by the urn:x-wiley:07403194:media:mrm28444:mrm28444-math-0002-field modification coil was 113 Hz/mA. The probe was tested with currents up to 100 mA. The DC current in the local field modification coil did not introduce visible artifacts in the MR images. Furthermore selective off-resonant excitation of the new field probes at 2 kHz above the main RF frequency was demonstrated. Gradient impulse response functions measured with a traditional and proposed probe show similar gradient imperfections. Conclusions The presented approach opens up new possibilities for concurrent field monitoring during MR experiments using standard RF capabilities of clinical scanners

Download or read book Development of Electric and Magnetic Near field Probes written by Frank M. Greene and published by . This book was released on 1975 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic and Electric Field Probes for Transient Measurements written by Kenneth W. Tomlinson and published by . This book was released on 1969 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effectiveness of recently developed magnetic and electric field probes is evaluated. Three probes were evaluated: a high-frequency, wide-band variable mu magnetometer, with a small sensor head for measuring inside enclosures, covering a 10-Hz to 10-MHz frequency range; a sensitive 3-Mhz to 30-MHz magnetic field probe; and a high impedance 400-Hz to 50-MHz electric field probe. These devices were developed to produce improved and more versatile instrumentation for the investigation and evaluation of electromagnetic interference problems. The probes in common use today do not have a constant response over their frequency ranges and require many adjustments and calibrations to make them useful. The probes evaluated use active circuitry to produce a constant response over their operating ranges and, therefore, require little calibration. These probes will be used for measuring and recording broad-band transients and for making narrow-band automated interference measurements. (Author).

Download or read book High Magnetic Field Science and Its Application in the United States written by National Research Council and published by National Academies Press. This book was released on 2013-12-25 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Committee to Assess the Current Status and Future Direction of High Magnetic Field Science in the United States was convened by the National Research Council in response to a request by the National Science Foundation. This report answers three questions: (1) What is the current state of high-field magnet science, engineering, and technology in the United States, and are there any conspicuous needs to be addressed? (2) What are the current science drivers and which scientific opportunities and challenges can be anticipated over the next ten years? (3) What are the principal existing and planned high magnetic field facilities outside of the United States, what roles have U.S. high field magnet development efforts played in developing those facilities, and what potentials exist for further international collaboration in this area? A magnetic field is produced by an electrical current in a metal coil. This current exerts an expansive force on the coil, and a magnetic field is "high" if it challenges the strength and current-carrying capacity of the materials that create the field. Although lower magnetic fields can be achieved using commercially available magnets, research in the highest achievable fields has been, and will continue to be, most often performed in large research centers that possess the materials and systems know-how for forefront research. Only a few high field centers exist around the world; in the United States, the principal center is the National High Magnetic Field Laboratory (NHMFL). High Magnetic Field Science and Its Application in the United States considers continued support for a centralized high-field facility such as NHFML to be the highest priority. This report contains a recommendation for the funding and siting of several new high field nuclear magnetic resonance magnets at user facilities in different regions of the United States. Continued advancement in high-magnetic field science requires substantial investments in magnets with enhanced capabilities. High Magnetic Field Science and Its Application in the United States contains recommendations for the further development of all-superconducting, hybrid, and higher field pulsed magnets that meet ambitious but achievable goals.

Download or read book Mathematics and Physics of Emerging Biomedical Imaging written by Committee on the Mathematics and Physics of Emerging Dynamic Biomedical Imaging and published by National Academies Press. This book was released on 1996-03-13 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This cross-disciplinary book documents the key research challenges in the mathematical sciences and physics that could enable the economical development of novel biomedical imaging devices. It is hoped that the infusion of new insights from mathematical scientists and physicists will accelerate progress in imaging. Incorporating input from dozens of biomedical researchers who described what they perceived as key open problems of imaging that are amenable to attack by mathematical scientists and physicists, this book introduces the frontiers of biomedical imaging, especially the imaging of dynamic physiological functions, to the educated nonspecialist. Ten imaging modalities are covered, from the well-established (e.g., CAT scanning, MRI) to the more speculative (e.g., electrical and magnetic source imaging). For each modality, mathematics and physics research challenges are identified and a short list of suggested reading offered. Two additional chapters offer visions of the next generation of surgical and interventional techniques and of image processing. A final chapter provides an overview of mathematical issues that cut across the various modalities.

Download or read book Opportunities in High Magnetic Field Science written by National Research Council and published by National Academies Press. This book was released on 2005-08-26 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-field magnetsâ€"those that operate at the limits of the mechanical and/or electromagnetic properties of their structural materialsâ€"are used as research tools in a variety of scientific disciplines. The study of high magnetic fields themselves is also important in many areas such as astrophysics. Because of their importance in scientific research and the possibility of new breakthroughs, the National Science Foundation asked the National Research Council to assess the current state of and future prospects for high-field science and technology in the United States. This report presents the results of that assessment. It focuses on scientific and technological challenges and opportunities, and not on specific program activities. The report provides findings and recommendations about important research directions, the relative strength of U.S. efforts compared to other countries, and ways in which the program can operate more effectively.

Download or read book The Principles of Nuclear Magnetism written by A. Abragam and published by Oxford University Press. This book was released on 1961 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Principles of Nuclear Magnetism

Download or read book A Magnetic Field Probe for Use in Extremely Low Frequency ELF Animal Exposure Systems written by and published by . This book was released on 1989 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of a program to measure the effects of extremely low frequency (ELF) fields on animals, a magnetic field probe was developed which could be suspended over a mouse cage to measure localized fields at the bottom of the cage. The device had to be small enough to fit inside a mouse cage, had to reproduce an ELF waveform accurately, its dynamic range should cover fields between 1 uT and 5 mT, there must be a simple relationship between field strength and output signal, and signals outside the range of interest should be filtered out. This paper describes the design and testing of such a device.

Download or read book An Investigation of Receiver Probe Development for Magnetic Resonance Microscopy written by Jeffrey Scott Boyer and published by . This book was released on 1995 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Principles of Magnetic Resonance Imaging written by Zhi-Pei Liang and published by Wiley-IEEE Press. This book was released on 2000 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1971 Dr. Paul C. Lauterbur pioneered spatial information encoding principles that made image formation possible by using magnetic resonance signals. Now Lauterbur, "father of the MRI", and Dr. Zhi-Pei Liang have co-authored the first engineering textbook on magnetic resonance imaging. This long-awaited, definitive text will help undergraduate and graduate students of biomedical engineering, biomedical imaging scientists, radiologists, and electrical engineers gain an in-depth understanding of MRI principles. The authors use a signal processing approach to describe the fundamentals of magnetic resonance imaging. You will find a clear and rigorous discussion of these carefully selected essential topics: Mathematical fundamentals Signal generation and detection principles Signal characteristics Signal localization principles Image reconstruction techniques Image contrast mechanisms Image resolution, noise, and artifacts Fast-scan imaging Constrained reconstruction Complete with a comprehensive set of examples and homework problems, Principles of Magnetic Resonance Imaging is the must-read book to improve your knowledge of this revolutionary technique.

Download or read book Electron Magnetic Resonance Principles written by Yuanzhi Xu and published by Walter de Gruyter GmbH & Co KG. This book was released on 2019-08-05 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents principles of electron magnetic resonance from a chemist’s point-of-view, covering g-tensor theory, isotropical hyperfine structure, anisotropical hyperfine structure and fine structure of spectrum, and relaxation theory. Detailed explanations on quantitative determination of paramagnetic species are given to address readers' difficulties. Written as a physical chemistry graduate textbook, it is also suitable for industry users.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Official Gazette of the United States Patent Office written by United States. Patent Office and published by . This book was released on 1967 with total page 1816 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Field Response Measurement Acquisition System written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement acquisition method that alleviates many shortcomings of traditional measurement systems is presented in this paper. The shortcomings are a finite number of measurement channels, weight penalty associated with measurements, electrical arcing, wire degradations due to wear or chemical decay and the logistics needed to add new sensors. The key to this method is the use of sensors designed as passive inductor-capacitor circuits that produce magnetic field responses. The response attributes correspond to states of physical properties for which the sensors measure. A radio frequency antenna produces a time-varying magnetic field used to power the sensor and receive the magnetic field response of the sensor. An interrogation system for discerning changes in the sensor response is presented herein. Multiple sensors can be interrogated using this method. The method eliminates the need for a data acquisition channel dedicated to each sensor. Methods of developing magnetic field response sensors and the influence of key parameters on measurement acquisition are discussed.Woodard, Stanley E. and Taylor, Bryant D. and Shams, Qamar A. and Fox, Robert L.Langley Research CenterMAGNETIC MEASUREMENT; DATA ACQUISITION; SYSTEMS HEALTH MONITORING; MAGNETIC FIELDS; MULTISENSOR FUSION; RADIO FREQUENCIES

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt: