Dielectric inserts for sensitivity and RF magnetic field enhancement in NMR volume coils

Arnon Neufeld; Naftali Landsberg; Amir Boag

doi:10.1016/j.jmr.2009.06.001

Dielectric inserts for sensitivity and RF magnetic field enhancement in NMR volume coils

Arnon Neufeld, Naftali Landsberg, Amir Boag

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

A method for enhancing the signal to noise ratio (SNR) in NMR volume coils is described. By introducing inserts made of low-loss, high dielectric constant material into specific locations in the coil, the SNR can often be enhanced by up to 20%, while B₁ homogeneity is hardly affected. A model for predicting the limit of the SNR improvement is also presented. The model accurately predicts the SNR gain obtained in both numerical simulations and experiment. An experiment was conducted on a mini-MRI system. Experimental results are in very good agreement with the simulations in regard to both SNR improvement and B₁ enhancement in transmission. Inserts made of ultra high dielectric constant materials can be as thin as few millimeters, thus, conveniently fitting into existing coil-sample gaps in volume coils.

Original language	English
Pages (from-to)	49-55
Number of pages	7
Journal	Journal of Magnetic Resonance
Volume	200
Issue number	1
DOIs	https://doi.org/10.1016/j.jmr.2009.06.001
State	Published - Sep 2009

Keywords

Dielectric inserts
Dielectric layer
RF Field model
RF coil
Sensitivity
Signal to Noise Ratio - SNR

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10.1016/j.jmr.2009.06.001

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abstract = "A method for enhancing the signal to noise ratio (SNR) in NMR volume coils is described. By introducing inserts made of low-loss, high dielectric constant material into specific locations in the coil, the SNR can often be enhanced by up to 20%, while B1 homogeneity is hardly affected. A model for predicting the limit of the SNR improvement is also presented. The model accurately predicts the SNR gain obtained in both numerical simulations and experiment. An experiment was conducted on a mini-MRI system. Experimental results are in very good agreement with the simulations in regard to both SNR improvement and B1 enhancement in transmission. Inserts made of ultra high dielectric constant materials can be as thin as few millimeters, thus, conveniently fitting into existing coil-sample gaps in volume coils.",

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AU - Neufeld, Arnon

AU - Landsberg, Naftali

AU - Boag, Amir

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N2 - A method for enhancing the signal to noise ratio (SNR) in NMR volume coils is described. By introducing inserts made of low-loss, high dielectric constant material into specific locations in the coil, the SNR can often be enhanced by up to 20%, while B1 homogeneity is hardly affected. A model for predicting the limit of the SNR improvement is also presented. The model accurately predicts the SNR gain obtained in both numerical simulations and experiment. An experiment was conducted on a mini-MRI system. Experimental results are in very good agreement with the simulations in regard to both SNR improvement and B1 enhancement in transmission. Inserts made of ultra high dielectric constant materials can be as thin as few millimeters, thus, conveniently fitting into existing coil-sample gaps in volume coils.

AB - A method for enhancing the signal to noise ratio (SNR) in NMR volume coils is described. By introducing inserts made of low-loss, high dielectric constant material into specific locations in the coil, the SNR can often be enhanced by up to 20%, while B1 homogeneity is hardly affected. A model for predicting the limit of the SNR improvement is also presented. The model accurately predicts the SNR gain obtained in both numerical simulations and experiment. An experiment was conducted on a mini-MRI system. Experimental results are in very good agreement with the simulations in regard to both SNR improvement and B1 enhancement in transmission. Inserts made of ultra high dielectric constant materials can be as thin as few millimeters, thus, conveniently fitting into existing coil-sample gaps in volume coils.

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KW - RF Field model

KW - RF coil

KW - Sensitivity

KW - Signal to Noise Ratio - SNR

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Dielectric inserts for sensitivity and RF magnetic field enhancement in NMR volume coils

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Keywords

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