Dual-Band Transceiver High Impedance Coil Array for Ultra-high Field Magnetic Resonance Imaging

Masoud Sharifian Mazraeh Mollaei, Ali S. M. Mollaei, Constantin R. Simovski

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A novel approach for designing an element of an arrayed radio-frequency coil for ultra-high field magnetic resonance imaging is presented. The purpose of this approach is to achieve the dual-band transceiver regime in a compact array of magnetic antennas. Our work qualitatively develops the concept of the so-called high-impedance coil (HIC), combined with the adequate interfacing circuitry, which offers the decoupling of the HICs in the array due to the very high self-impedance compared to the mutual impedance. This concept has not been previously thought applicable to dual-band transceiver arrays. We show that by slightly modifying only the cable shield, we achieve a dual-band transceiver high impedance coil (TRHIC). The needed modification implies two asymmetric gaps granting two useful eigenmodes to the cable loop. The resonant excitation of these modes will allow the magnetic resonant scanning of both Hydrogen and Phosphorus in the 7 T dc magnetic field. To verify our ideas, we simulated and measured a single TRHIC in both transmitting and receiving regimes, and similarly studied two linear arrays made of two and three proposed TRHICs. The method of asymmetric gaps, in our opinion, allows one to engineer the targeted multi-frequency operation of arrayed TRHICs decoupled at these frequencies.
Original languageEnglish
Article number9539033
Number of pages11
JournalIEEE Transactions on Antennas and Propagation
DOIs
Publication statusE-pub ahead of print - 15 Sep 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Antenna arrays
  • Magnetic resonance imaging
  • Impedance
  • Antennas
  • Resonant frequency
  • Transceivers
  • Dual band

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