An inductively coupled, series-tuned NMR probe

Décorps, M.; Blondet, P; Reutenauer, H.; Albrand, J. P.; Rémy, Chantal

doi:10.1016/0022-2364(85)90378-6

Cited by 79 publications

(66 citation statements)

References 4 publications

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“…Inductive coupling has been introduced and used very early in NMR and MRI (30)(31)(32)(33)(34)(35). Resonant inductive coupling to a resonator has been introduced by Diodato et al (36) in the context of EPR.…”

Section: Coupling To Rotating Coils By Resonant Inductive Couplingmentioning

confidence: 99%

NMR signal detection using inductive coupling: Applications to rotating microcoils

Jacquinot

Sakellariou

2011

Concepts Magnetic Resonance

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Sensitivity in solid-state nuclear magnetic resonance can be improved by the use of rotating microcoils (1). The connection to the rest of the electronics is performed through resonant inductive coupling. This mode of detection of nuclear induction has major advantages as it provides a wireless way to obtain extremely high radio-frequency amplitudes per unit current under sample rotation and thus improved sensitivity for size-limited samples. We review the circuit electronics and discuss experimental optimization of the probe and coil parameters. We also present alternative geometries for coupling between rotating coils and we explicitly calculate the signal enhancement. Two practical cases are presented, namely a standard magic angle sample spinning probe and a double sample rotation probe. We conclude with a theoretical discussion about the limits of detection attainable with coil miniaturization.

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Section: Coupling To Rotating Coils By Resonant Inductive Couplingmentioning

confidence: 99%

NMR signal detection using inductive coupling: Applications to rotating microcoils

Jacquinot

Sakellariou

2011

Concepts Magnetic Resonance

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“…9,10 The dielectric losses are caused by voltage differences among different parts of the receiver coil that produce an electrostatic fiel around the coil. 7,8,11 Dielectric losses cause detuning of the receiver circuit, and therefore the reduction of the received signal. These losses can be reduced by designing a balanced SC, which allows improvement of up to 75% compared to the equivalent, unbalanced design.…”

Section: Noisementioning

confidence: 99%

“…These losses can be reduced by designing a balanced SC, which allows improvement of up to 75% compared to the equivalent, unbalanced design. The results are better still if the tuning capacitance is distributed along the coil, 11 by placing several equivalent distributed capacitors instead of using only one. Tuning and matching procedures of commonly used SCs are implemented using two or three tunable capacitor components.…”

Section: Noisementioning

confidence: 99%

“…The main advantage of inductively-coupled SCs is their balanced structure that reduces the dielectric losses. 11,12 In addition, matching is achieved by varying the coupling between coils. For this reason, such designs are also known as single-parameter adjustable probes, since only a tuning capacitor needs to be used (Fig.…”

Section: Noisementioning

confidence: 99%

“…SC also enhance the SNR with respect to the body coils over its Field of View (FOV) and, due to its inherent higher spatial selectivity, it is possible to improve the spatial resolution on the visualization of small structures. 11,12 In the Theory section, we describe the basic physic principles applied to the SC designs. In the Material and Methods section, our SC implementation itself, as well as the settings and subjects for the experiments are described.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

MRI Visualization of Small Structures Using Improved Surface Coils

Rivera¹,

Vaquero²,

Santos³

et al. 1998

Magnetic Resonance Imaging

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In this paper we present the spatial resolution enhancement and noise reduction level achieved with an optimized inductively coupled surface coil specificall designed for our experiments. The technique of designing and implementing customized coils for magnetic resonance imaging of very small structures is described. We have designed a low cost prototype of an inductively coupled circular surface coil, tuned for 1 H magnetic resonance imaging at 200 MHz. The coil is mounted on a customized teflo support. The inductive coupling used in this coil improves the signal-to-noise ratio by reducing various loss mechanisms (specially the dielectric losses). Test images have been acquired to determine the evolution of induced articular lesions in a rabbit animal model, as well as brain tumors in rats. The images show high spatial resolution, excellent B 1 fiel homogeneity and no ''hot spots''. Comparing these images with those acquired with conventional coils, one find better spatial resolution and signal-to-noise ratio, as well as larger fiel of view with less intense illumination artifact. The methodology can be used in any application that requires high quality imaging of small structures.

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