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Abstract #1331

Cartesian Feedback Configuration with Direct RF Signal Injection for Power Amplifier Linearization at 1.5T MRI

Jonathan Y Lu 1 , Pascal P. Stang 1 , John M. Pauly 1 , Marta G. Zanchi 2 , and Greig C. Scott 1

1 Dept of Electrical Engineering, Stanford University, Stanford, CA, United States, 2 School of Medicine, Stanford University, Stanford, CA, United States

We demonstrate a modified version of Cartesian feedback, an RF power amplifier linearization technique, for use at 1.5T. In this feedback configuration, the MRI RF signal is directly injected at a point in the feedback loop that allows us to eliminate the initial down-converter needed to convert the MRI signal to baseband or intermediate frequency. Amplifier linearization is important especially in multichannel transmit where unpredictable coil loading conditions can affect amplifiers in the stage before, while this particular arrangement allows appreciable components savings and simplification in architecture when multiple coils are used.

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