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

Arnon Neufeld, Naftali Landsberg, Amir Boag

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)49-55
Number of pages7
JournalJournal of Magnetic Resonance
Volume200
Issue number1
DOIs
StatePublished - Sep 2009

Keywords

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

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