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Abstract #0320

Broadband Multi-Channel Optical Interface for On-Coil Switch-Mode RF Amplification

Natalia Gudino 1 , Jacco A de Zwart 1 , Qi Duan 1 , Stephen J Dodd 2 , Peter Van Gelderen 1 , and Jeff H Duyn 1

1 Advanced MRI section, LFMI, NINDS, National Institutes of Health, Bethesda, MD, United States, 2 LFMI, NINDS, National Institutes of Health, Bethesda, MD, United States

On-coil switch mode amplification has been presented as a promising alternative for the implementation of multi-channel transmit systems by reducing cost and complexity. This non-conventional RF amplification is driven by separate optical carrier and envelope signals, which require a special interface, not available with current scanner systems. Here we present a simple low-cost prototype that can generate multiple independently controlled RF carriers and envelope signals from the single low power RF pulse waveform input to the MRI systems RF amplifier. The interface is designed to operate over a large range of magnetic field strengths without hardware adjustments.

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