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 journalArticlepeer-review

16 Scopus citations


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
Issue number2
StatePublished - Feb 2014
Externally publishedYes


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

ASJC Scopus subject areas

  • Biomedical Engineering


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