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Abstract #1468

An Automated Cartesian Feedback Transceiver for Use in High Magnetic Fields

David Ian Hoult1, Glen Kolansky1, Derek Foreman1, John Rendell1, Mikhail Barklon1, Karl Edler1, Lawrence Ryner1, Denis Le Bihan2

1Institute for Biodiagnostics, National Research Council Canada, Winnipeg, Manitoba, Canada; 2Commissariat l'nergie atomique, NeuroSpin, Gif-sur-Yvette, France

Magnetic resonance has been performed at 123.2 MHz with an automated Cartesian feedback instrument immersed in ~ 2 T field. No change of electronic characteristics was observed upon field immersion. With a probe having a loaded Q-factor of 20, 40 dB current blocking with a 500 W RF power amplifier was obtained over a bandwidth of 20 kHz. A rectangular high power RF pulse exhibited no visible droop or phase change, while a ramp pulse exhibited no visible non-linearity or phase change. In signal reception over 160 kHz, current blocking of 40 dB was observed, a performance previously unattainable.