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Review of Scientific Instruments : Single-sided radio-frequency field gradient with two unsymmetrical loops: Applications to nuclear magnetic resonance

By Laouès Guendouz, Sébastien Leclerc, Alain Retournard, Ahcène Hedjiedj, and Daniel Canet

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Book Id: WPLBN0002169698
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 12 December 2008

Title: Review of Scientific Instruments : Single-sided radio-frequency field gradient with two unsymmetrical loops: Applications to nuclear magnetic resonance  
Author: Laouès Guendouz, Sébastien Leclerc, Alain Retournard, Ahcène Hedjiedj, and Daniel Canet
Volume: Issue : December 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Review of Scientific Instruments Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Sébastien Leclerc, Alain Retournard, Ahcène Hedjiedj, And Daniel Cane, L. G. (n.d.). Review of Scientific Instruments : Single-sided radio-frequency field gradient with two unsymmetrical loops: Applications to nuclear magnetic resonance. Retrieved from http://hawaiilibrary.net/


Description
Description: 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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