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Abstract #0426

Time-Interleaved Radiation Damping Feedback for Increased Steady-State Signal Response

Florian Wiesinger1, Eric W. Fiveland2, Albert J. Byun2, Pekka Sipilae1, Christopher J. Hardy2

1Imaging Technologies, GE Global Research, Munich, Germany; 2MRI Laboratory, GE Global Research, Niskayuna, NY, United States

Radiation damping (RD) describes a second-order effect where the signal-induced current in the receiver coils acts back onto the primary spin system. According to Lenzs law, the RD acts in a way to oppose its original cause. In that sense RD can be understood as a self-regulating flip-back pulse. Recently, RD feedback loops have been introduced into the RF signal path to boost the natural RD effect. While previous RD circuits were limited in terms of feedback gain, here we present a new feedback circuit, which principally circumvents this problem via time separation of RD receive and transmit.