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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