Comparison of 16-Channel Asymmetric Sleeve Antenna and Dipole Antenna Transceiver Arrays at 10.5 Tesla MRI

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Multi-element transmit arrays with low peak 10 g specific absorption rate (SAR) and high SAR efficiency (defined as ( [Formula: see text]SAR [Formula: see text] are essential for ultra-high field (UHF) magnetic resonance imaging (MRI) applications. Recently, the adaptation of dipole antennas used as MRI coil elements in multi-channel arrays has provided the community with a technological solution capable of producing uniform images and low SAR efficiency at these high field strengths. However, human head-sized arrays consisting of dipole elements have a practical limitation to the number of channels that can be used due to radiofrequency (RF) coupling between the antenna elements, as well as, the coaxial cables necessary to connect them. Here we suggest an asymmetric sleeve antenna as an alternative to the dipole antenna. When used in an array as MRI coil elements, the asymmetric sleeve antenna can generate reduced peak 10 g SAR and improved SAR efficiency. To demonstrate the advantages of an array consisting of our suggested design, we compared various performance metrics produced by 16-channel arrays of asymmetric sleeve antennas and dipole antennas with the same dimensions. Comparison data were produced on a phantom in electromagnetic (EM) simulations and verified with experiments at 10.5 Tesla (T). The results produced by the 16-channel asymmetric sleeve antenna array demonstrated 28 % lower peak 10 g SAR and 18.6 % higher SAR efficiency when compared to the 16-channel dipole antenna array.

Original languageEnglish (US)
Article number9306900
Pages (from-to)1147-1156
Number of pages10
JournalIEEE Transactions on Medical Imaging
Volume40
Issue number4
DOIs
StatePublished - Apr 2021

Bibliographical note

Publisher Copyright:
© 1982-2012 IEEE.

Keywords

  • Cable trap
  • asymmetric sleeve antenna
  • deep brain imaging
  • dipole antenna
  • ultra-high field magnetic resonance imaging
  • Magnetic Resonance Imaging
  • Humans
  • Radio Waves
  • Benchmarking
  • Phantoms, Imaging
  • Equipment Design

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural

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