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Abstract #1844

Optimizing the Current-Mode Class D (CMCD) Amplifier for Decoupling in pTX Arrays

Michael Twieg 1 and Mark A Griswold 1,2

1 Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, OH, United States, 2 Department of Radiology, Case Western Reserve University, Cleveland, OH, United States

Decoupling of elements in a parallel transmit array has proven to be a significant obstacle to implementing parallel transmit (pTX) in MRI applications. Typically, a coil array is designed to reduce mutual impedance between elements, but this approach alone has limitations. Additional methods of decoupling include passive impedance transformations and closed loop control. Such methods have been explored with linear amplifier topologies, but little has been reported about approaches to decoupling high-efficiency switchmode amplifier topologies. Here we present improvements in the decoupling between elements driven by CMCD amplifiers using passive impedance transformation and closed loop current magnitude feedback.

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