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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