Single-channel, box-shaped, monopole-type antenna for B1+field manipulation in conjunction with the traveling-wave concept in 9.4 T MRI

Irena Zivkovic, Klaus Scheffler

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Object We have developed a single-channel, box-shaped, monopole-type antenna which, if used in two different configurations, excites complementary B1+ field distributions in the traveling-wave setup. Materials and methods A new monopole-type, single-channel antenna for RF excitation in 9.4 T magnetic resonance imaging is proposed. The antenna is entirely made of copper without lumped elements. Two complementary B1+ field distributions of two different antenna configurations were measured and combined as a root sum of squares. B1+ field inhomogeneity of the combined maps was calculated and compared with published results. Results By combining B1+ field distributions generated by two antenna configurations, a “no voids” pattern was achieved for the entire upper brain. B1+ inhomogeneity of approximately 20 % was achieved for sagittal and transverse slices; it was <24 % for coronal slices. The results were comparable with those from CP, with “no voids” in slice B1+ inhomogeneity of multichannel loop arrays. The efficiency of the proposed antenna was lower than that of a multichannel array but comparable with that of a patch antenna. Conclusion The proposed single-channel antenna is a promising candidate for traveling-wave brain imaging. It can be combined with the time-interleaved acquisition of modes (TIAMO) concept if reconfigurability is obtained with a single-antenna element.
Original languageEnglish
Pages (from-to)357-362
JournalMagnetic Resonance Materials in Physics, Biology and Medicine
Volume28
Issue number4
DOIs
Publication statusPublished - Aug 2015
Externally publishedYes

Keywords

  • 9.4 T
  • Transmit coil
  • Time-interleaved acquisition of modes (TIAMO)
  • High-field MRI

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