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Dheyaa Alkandari1, John C Bosshard2, Chung-Huan Huang2

  • 1Department of Electrical Engineering, Kuwait University, Kuwait City, Kuwait.

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This study introduces a novel 16-bowtie slot volume coil with eight independent modules, eliminating the need for decoupling circuits to mitigate coil element coupling effects in MRI.

Keywords:
arraycouplinghigh field MRmulti-channel RF coilslot antennaslot module

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency (RF) Coil Design
  • Electromagnetics

Background:

  • Coil element coupling is a persistent challenge in MRI system design.
  • Decoupling circuits are traditionally used to manage these effects.
  • Novel approaches are needed to improve coil performance and reduce complexity.

Purpose of the Study:

  • To present a 16-bowtie slot volume coil with eight independent dual-slot modules.
  • To demonstrate effective mitigation of coupling effects without decoupling circuits.
  • To evaluate the performance of this novel coil design.

Main Methods:

  • Utilized two electrically short "bowtie" slot antennas to form an independent module.
  • Employed electromagnetic modeling, bench tests, and MRI experiments at 4.7 Tesla.
  • Compared performance against a birdcage coil and an eight-dipole coil.

Main Results:

  • Worst-case module coupling was below -14.5 dB, confirmed by bench tests.
  • MRI experiments showed well-localized patterns and homogeneous images.
  • RF power requirements were higher than a birdcage coil, but simulated power dissipation was comparable.
  • Simulations at 7 Tesla indicated equivalent B1+ homogeneity compared to an eight-dipole coil.

Conclusions:

  • The proposed slot module design inherently minimizes coupling between elements.
  • This design is suitable for multi-channel transmit coils, especially when power availability is not a limitation.
  • The approach offers a promising alternative for advanced MRI coil development.