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Related Experiment Videos

Overcoming high-field RF problems with non-magnetic Cartesian feedback transceivers.

D I Hoult1, D Foreman, G Kolansky

  • 1Institute for Biodiagnostics, National Research Council Canada, 435 Ellice Avenue, Winnipeg, MB, R3B 1Y6, Canada. david.hoult@nrc-cnrc.gc.ca

Magma (New York, N.Y.)
|November 21, 2007
PubMed
Summary
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High-field Magnetic Resonance (MR) imaging requires new radio-frequency coil designs. This study proposes Cartesian feedback transceivers to manage coil interactions, achieving a standard for induced currents and enabling advanced MR protocols.

Area of Science:

  • Medical Physics
  • Magnetic Resonance Imaging

Background:

  • Extending human Magnetic Resonance (MR) to 10 T field strengths presents challenges with radio-frequency (RF) wavelengths relative to body size.
  • Conventional large RF coils are insufficient; arrays of smaller coils are necessary for generating RF magnetic fields.

Purpose of the Study:

  • To examine radio-frequency (RF) array coil interactions during transmission in high-field MR.
  • To propose and validate a standard for secondary induced currents in RF coil arrays.
  • To introduce a novel solution for mitigating coil interactions and improving MR system performance.

Main Methods:

  • Investigated array coil interactions during transmission, proposing a standard for secondary induced currents (<1% of primary).
  • Evaluated cancellation methods and high output impedance amplifiers, finding them inadequate.

Related Experiment Videos

  • Proposed and experimentally validated non-magnetic Cartesian feedback transceivers at the magnet entrance.

    • Main Results:

    • Standard Cartesian feedback transceivers and high output impedance amplifiers were found insufficient for managing coil interactions.
    • Cartesian feedback transceivers demonstrated stable operation, meeting the proposed standard for induced currents.
    • The proposed standard was typically attained over a 22 kHz bandwidth during transmission, sufficient for current MR protocols.

    Conclusions:

    • Cartesian feedback transceivers offer a cost-effective solution for reducing instrumentation costs in high-field MR.
    • This technology enhances the bandwidth for meeting interaction standards, crucial for advanced MR imaging.
    • Experimental validation confirms the efficacy of Cartesian feedback transceivers for stable MR transmission.