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Related Experiment Video

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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

Summary

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.

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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.
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.