| Single-sided radio-frequency field gradient with two unsymmetrical loops: Applications to nuclear magnetic resonance. | |
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MedLine Citation:
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PMID: 19123566 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Magnetic field gradients are nowadays indispensable to most nuclear magnetic resonance experiments and are at the basis of magnetic resonance imaging (MRI). Most of the time, gradients of the static magnetic field are employed. Gradients of the radio-frequency (rf) field may constitute an interesting alternative. Until now, they were produced by a single loop. We demonstrate in this paper how two unsymmetrical series loops can be optimized to produce rf gradients of much better performances. This optimization is based on a thorough theoretical approach and the gradient uniformity is studied through accurate simulations. Two prototypes were devised: one for a 2.34 T horizontal magnet (used in MRI), and the other for a 4.7 T vertical magnet (used for pure spectroscopic applications). These two-loop systems were designed for proton resonance frequencies (100 and 200 MHz, respectively). Performances of both systems were verified (versus theoretical predictions) by means of experiments employing gradients in view of the determination of the self-diffusion coefficients of liquids. |
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Authors:
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Laouès Guendouz; Sébastien Leclerc; Alain Retournard; Ahcène Hedjiedj; Daniel Canet |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Review of scientific instruments Volume: 79 ISSN: 1089-7623 ISO Abbreviation: Rev Sci Instrum Publication Date: 2008 Dec |
Date Detail:
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Created Date: 2009-01-06 Completed Date: 2009-04-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0405571 Medline TA: Rev Sci Instrum Country: United States |
Other Details:
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Languages: eng Pagination: 123704 Citation Subset: - |
Affiliation:
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Laboratoire d'Instrumentation Electronique de Nancy, Faculte des Sciences et Techniques, Nancy Universite, BP 239, 54506 Vandoeuvre-les-Nancy Cedex, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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