RF B1 field calculation with transmission-line resonator analysis for high-field magnetic resonance systems

Hyoungsuk Yoo, J. Thomas Vaughan, Anand Gopinath

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The combined field integral equation (CFIE) method is used to calculate the RF magnetic B1 field produced by a transmission-line resonator element for high-field magnetic resonance systems. The method calculates the surface currents on a homogeneous phantom with triangular patches with the RaoWiltonGlisson (RWG) basis functions, and the tetrahedra with the SchaubertWiltonGlisson (SWG) basis functions are used to calculate the resonator element field. The transmission-line resonator element is excited at its resonant frequency and the equivalent surface current distribution over the phantom are obtained, and then the internal fields in the phantom are calculated for the 9.4-T MRI system. This integral equation method provides much faster B1 field results than the corresponding inite-difference time domain (FDTD) approach. A field localization method by adjusting phase excitations is also discussed.

Original languageEnglish
Article number5782928
Pages (from-to)592-595
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Volume10
DOIs
StatePublished - 2011 Jul 5

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Magnetic resonance
Resonators
Electric lines
Integral equations
Magnetic resonance imaging
Natural frequencies
Magnetic fields

Keywords

  • Combined field integral equation (CFIE)
  • magnetic resonance imaging (MRI)
  • method of moments (MoM)
  • radio frequency (RF) B field
  • radio frequency coil
  • transmission-line element

Cite this

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abstract = "The combined field integral equation (CFIE) method is used to calculate the RF magnetic B1 field produced by a transmission-line resonator element for high-field magnetic resonance systems. The method calculates the surface currents on a homogeneous phantom with triangular patches with the RaoWiltonGlisson (RWG) basis functions, and the tetrahedra with the SchaubertWiltonGlisson (SWG) basis functions are used to calculate the resonator element field. The transmission-line resonator element is excited at its resonant frequency and the equivalent surface current distribution over the phantom are obtained, and then the internal fields in the phantom are calculated for the 9.4-T MRI system. This integral equation method provides much faster B1 field results than the corresponding inite-difference time domain (FDTD) approach. A field localization method by adjusting phase excitations is also discussed.",
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RF B1 field calculation with transmission-line resonator analysis for high-field magnetic resonance systems. / Yoo, Hyoungsuk; Vaughan, J. Thomas; Gopinath, Anand.

In: IEEE Antennas and Wireless Propagation Letters, Vol. 10, 5782928, 05.07.2011, p. 592-595.

Research output: Contribution to journalArticle

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