RF Coils for MRI by J. Thomas Vaughan, John R. Griffiths

By J. Thomas Vaughan, John R. Griffiths

The content material of this quantity has been additional to eMagRes (formerly Encyclopedia of Magnetic Resonance) - the last word on-line source for NMR and MRI.

To date there's no unmarried reference aimed toward educating the paintings of purposes guided coil layout to be used in MRI. This RF Coils for MRI handbook is meant to turn into this reference. 

Heretofore, a lot of the information of RF coil layout is bottled up in a variety of and educational laboratories around the globe. a few of this knowledge on coil applied sciences and purposes recommendations has been disseminated in the course of the literature, whereas extra of this information has been withheld for aggressive or proprietary virtue. Of the printed works, the checklist of expertise improvement is frequently incomplete and deceptive, exact referencing and attribution task being tantamount to admission of patent infringement within the advertisement arena.  for that reason, the literature on RF coil layout is fragmented and confusing.  There aren't any texts and few classes provided to educate this fabric. Mastery of the paintings and technological know-how of RF coil layout may be top accomplished during the studying that includes a protracted occupation within the box at a number of areas of employment…until now.

RF Coils for MRI combines the lifetime realizing and services of some of the senior designers within the box right into a unmarried, useful education guide. It informs the engineer on half numbers and assets of part fabrics, apparatus, engineering companies and consulting to let somebody with electronics bench event to construct, try out and interface a coil. The instruction manual teaches the MR procedure person how you can adequately and effectively enforce the coil for its meant software. the great articles additionally comprise info required through the scientist or surgeon to foretell respective scan or medical functionality of a coil for a number of universal applications.  it truly is anticipated that RF Coils for MRI turns into an enormous source for engineers, technicians, scientists, and physicians desirous to adequately and effectively purchase or construct and use MR coils within the health facility or laboratory.  equally, this guidebook offers educating fabric for college students, fellows and citizens eager to larger comprehend the idea and operation of RF coils.

Many of the articles were written via the pioneers and builders of coils, arrays and probes, so this can be all first hand info! The guide serves as an expository advisor for hands-on radiologists, radiographers, physicians, engineers, scientific physicists, technologists, and for a person with pursuits in development or settling on and utilizing RF coils to accomplish most sensible medical or experimental results.

About EMR Handbooks / eMagRes Handbooks 

The Encyclopedia of Magnetic Resonance (up to 2012) and eMagRes (from 2013 onward) put up quite a lot of on-line articles on all facets of magnetic resonance in physics, chemistry, biology and medication. The life of this massive variety of articles, written by means of specialists in a variety of fields, is permitting the booklet of a sequence of EMR Handbooks / eMagRes Handbooks on particular components of NMR and MRI. The chapters of every of those handbooks will include a gently selected choice of articles from eMagRes. In session with the eMagRes Editorial Board, the EMR Handbooks / eMagRes Handbooks  are coherently deliberate upfront by way of specially-selected Editors, and new articles are written (together with updates of a few already current articles) to provide applicable whole insurance. The handbooks are meant to be of worth and curiosity to analyze scholars, postdoctoral fellows and different researchers studying in regards to the clinical region in query and venture correct experiments, even if in academia or industry.

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Sample text

That the sensitivity per spin is proportional to the strength of the magnetic field generated at the site of the spin by a unit current in the receiver coil if it were to be used for transmitting, simply by being small. Although, sometimes thought of as a corollary to the filling factor, this effect is independent of it. It is simply a statement that the spin should be as close as possible to the wire in order that the sensitivity is maximized regardless of the filling factor. The simple fact that all parts of the sample inside the microcoil are very close to the coil wires guarantees good sensitivity per spin, which compensates for the relatively small size of the sample and relatively large resistance of the thin coil wire (see Chapter 19).

1 INTRODUCTION 27 28 30 33 34 34 35 35 36 Magnetic resonance imaging and spectroscopy (MRI/S) are invaluable tools in the study and treatment of disease. MRI is a basic radiological tool used in the diagnosis of neurologic, orthopedic, cardiovascular, and oncologic disorders. MRS, the discipline out of which MRI developed, can be used for noninvasive detection and quantification of various metabolites in biological tissue. A continuing trend in magnetic resonance is the use of higher magnetic field strengths, with whole-body MRI scanners having static magnetic fields of 3–7 T and smaller bore animal MRI scanners with static magnetic fields up to 21 T.

In the low frequency, the trap resonance is above the mode frequency and the reactance primarily inductive, with most of the trap current flowing through the trap inductor. L1 and Cs are the controlling reactive components and Cs can be used to vary the low frequency. At the high frequency, the situation is reversed. The trap resonant frequency is below the mode frequency and the reactance primarily capacitive, with most of the current flowing through the trap capacitor. C1 and Cs are now the controlling reactive components and C1 can be used to vary the high frequency.

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