Stepped Impedance Resonators for High-Field Magnetic Resonance Imaging
- Authors
- Akgun, Can E.; DelaBarre, Lance; Yoo, Hyoungsuk; Sohn, Sung-Min; Snyder, Carl J.; Adriany, Gregor; Ugurbil, Kamil; Gopinath, Anand; Vaughan, J. Thomas
- Issue Date
- Feb-2014
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Magnetic resonance imaging (MRI); microstrip; radio-frequency (RF) coils; stepped impedance resonator (SIR); transverse electromagnetic (TEM)
- Citation
- IEEE Transactions on Biomedical Engineering, v.61, no.2, pp.327 - 333
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE Transactions on Biomedical Engineering
- Volume
- 61
- Number
- 2
- Start Page
- 327
- End Page
- 333
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/160623
- DOI
- 10.1109/TBME.2013.2250973
- ISSN
- 0018-9294
- 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.
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