Stepped impedance resonators for high-field magnetic resonance imaging

Can E. Akgun, Lance Delabarre, Hyoungsuk Yoo, Sung Min Sohn, Carl J. Snyder, Gregor Adriany, Kamil Ugurbil, Anand Gopinath, J. Thomas Vaughan

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Multi-element volume radio-frequency (RF) coils are an integral aspect of the growing field of high-field magnetic resonance imaging. In these systems, a popular volume coil of choice has become the transverse electromagnetic (TEM) transceiver coil consisting of microstrip resonators. In this paper, to further advance this design approach, a new microstrip resonator strategy in which the transmission line is segmented into alternating impedance sections, referred to as stepped impedance resonators (SIRs), is investigated. Single-element simulation results in free space and in a phantom at 7 T (298 MHz) demonstrate the rationale and feasibility of the SIR design strategy. Simulation and image results at 7 T in a phantom and human head illustrate the improvements in a transmit magnetic field, as well as RF efficiency (transmit magnetic field versus specific absorption rate) when two different SIR designs are incorporated in 8-element volume coil configurations and compared to a volume coil consisting of microstrip elements.

Original languageEnglish (US)
Article number6477090
Pages (from-to)327-333
Number of pages7
JournalIEEE Transactions on Biomedical Engineering
Volume61
Issue number2
DOIs
StatePublished - Feb 1 2014
Externally publishedYes

Fingerprint

Magnetic resonance
Resonators
Imaging techniques
Magnetic fields
Transceivers
Electric lines

Keywords

  • Magnetic resonance imaging (MRI)
  • microstrip
  • radio-frequency (RF) coils
  • stepped impedance resonator (SIR)
  • transverse electromagnetic (TEM)

ASJC Scopus subject areas

  • Biomedical Engineering

Cite this

Akgun, C. E., Delabarre, L., Yoo, H., Sohn, S. M., Snyder, C. J., Adriany, G., ... Vaughan, J. T. (2014). Stepped impedance resonators for high-field magnetic resonance imaging. IEEE Transactions on Biomedical Engineering, 61(2), 327-333. [6477090]. https://doi.org/10.1109/TBME.2013.2250973

Stepped impedance resonators for high-field magnetic resonance imaging. / Akgun, Can E.; Delabarre, Lance; Yoo, Hyoungsuk; Sohn, Sung Min; Snyder, Carl J.; Adriany, Gregor; Ugurbil, Kamil; Gopinath, Anand; Vaughan, J. Thomas.

In: IEEE Transactions on Biomedical Engineering, Vol. 61, No. 2, 6477090, 01.02.2014, p. 327-333.

Research output: Contribution to journalArticle

Akgun, CE, Delabarre, L, Yoo, H, Sohn, SM, Snyder, CJ, Adriany, G, Ugurbil, K, Gopinath, A & Vaughan, JT 2014, 'Stepped impedance resonators for high-field magnetic resonance imaging', IEEE Transactions on Biomedical Engineering, vol. 61, no. 2, 6477090, pp. 327-333. https://doi.org/10.1109/TBME.2013.2250973
Akgun, Can E. ; Delabarre, Lance ; Yoo, Hyoungsuk ; Sohn, Sung Min ; Snyder, Carl J. ; Adriany, Gregor ; Ugurbil, Kamil ; Gopinath, Anand ; Vaughan, J. Thomas. / Stepped impedance resonators for high-field magnetic resonance imaging. In: IEEE Transactions on Biomedical Engineering. 2014 ; Vol. 61, No. 2. pp. 327-333.
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