Dielectric enhanced dipoles for MRI - Approaching the ideal current pattern

Conference paper (2017)

Authors

W.M. Brink Leiden University Medical Center

J. Paska New York University School of Medicine

J. Dai Leiden University Medical Center

J.H.F. van Gemert

G. Chen New York University School of Medicine

G.C. Wiggins New York University School of Medicine

R.F. Remis Signal Processing Systems -

C.M. Collins New York University School of Medicine

A. Webb Leiden University Medical Center

Sensitivity Radio frequency Permittivity Dielectrics Inductors Signal to noise ratio

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Published Date

2017

Language

English

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Abstract

In this work we present a systematic evaluation of the potential of combining dielectric materials with an array of electric dipoles for MRI. Design parameters include the permittivity and length of a dielectric sleeve, as well as the dipole length and position of the tuning inductors. Results show that the combined approach improves transmit efficiency and SNR by ~10 to 15 % compared to an optimized dipole array without dielectric sleeve. The resulting induced current densities reflect an improved correspondence with the ideal current pattern, which explains the gains in performance.

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