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Planar quadrature coil design using shielded-loop resonators

A Stensgaard1

  • 1Danish Research Center of Magnetic Resonance, Hvidovre Hospital, Copenhagen, Denmark.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 1, 1997
PubMed
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Shielded-loop resonators enhance planar quadrature coil design, improving performance for 1H imaging and spectroscopy. This technology reduces capacitive sample loss, benefiting dual-loop and dual-mode circuits in MRI applications.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency (RF) Coil Engineering

Background:

  • Shielded-loop resonators are recognized for minimizing capacitive sample loss through effective balancing.
  • Planar quadrature coils are crucial components in MRI systems, particularly for high-resolution imaging and spectroscopy.

Purpose of the Study:

  • To investigate the application of shielded-loop technology in improving the design of planar quadrature coils.
  • To evaluate the benefits of shielded-loop resonators in dual-loop and dual-mode quadrature coil configurations.

Main Methods:

  • Theoretical analysis of dual-loop and dual-mode circuits incorporating shielded-loop resonators.
  • Design and fabrication of prototype transmit/receive coils for 1H imaging and spectroscopy at 4.7 Tesla.
  • Experimental validation of theoretical predictions through measurements on rat brain samples.

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Main Results:

  • Demonstrated that shielded-loop technology can enhance the design of planar quadrature coils.
  • Observed significant improvements in coil performance, particularly for dual-mode circuits.
  • Experimental measurements confirmed theoretical predictions for both dual-loop and dual-mode coil designs.

Conclusions:

  • Shielded-loop resonators offer a viable method for improving planar quadrature coil performance in MRI.
  • The technology is particularly beneficial for dual-mode coil designs, leading to enhanced signal-to-noise ratio and reduced losses.
  • The developed coils are suitable for high-field (4.7 T) 1H MRI of the rat brain.