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^*

^*Corresponding author for this work

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

Access to Document

10.1016/j.jmr.2009.06.001

Cite this

@article{d758de1c92e946dca0b3d0873e978cb4,

title = "Dielectric inserts for sensitivity and RF magnetic field enhancement in NMR volume coils",

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.",

keywords = "Dielectric inserts, Dielectric layer, RF Field model, RF coil, Sensitivity, Signal to Noise Ratio - SNR",

author = "Arnon Neufeld and Naftali Landsberg and Amir Boag",

year = "2009",

month = sep,

doi = "10.1016/j.jmr.2009.06.001",

language = "אנגלית",

volume = "200",

pages = "49--55",

journal = "Journal of Magnetic Resonance",

issn = "1090-7807",

publisher = "Academic Press Inc.",

number = "1",

}

TY - JOUR

T1 - Dielectric inserts for sensitivity and RF magnetic field enhancement in NMR volume coils

AU - Neufeld, Arnon

AU - Landsberg, Naftali

AU - Boag, Amir

PY - 2009/9

Y1 - 2009/9

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.

KW - Dielectric inserts

KW - Dielectric layer

KW - RF Field model

KW - RF coil

KW - Sensitivity

KW - Signal to Noise Ratio - SNR

UR - http://www.scopus.com/inward/record.url?scp=68049087644&partnerID=8YFLogxK

U2 - 10.1016/j.jmr.2009.06.001

DO - 10.1016/j.jmr.2009.06.001

M3 - מאמר

AN - SCOPUS:68049087644

VL - 200

SP - 49

EP - 55

JO - Journal of Magnetic Resonance

JF - Journal of Magnetic Resonance

SN - 1090-7807

IS - 1

ER -

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this