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Abstract #4945

RF Concatenation with Spiral In-And-Out Trajectory for Two-Dimensional Large-Tip-Angle Excitation

Seung-Kyun Lee1, Dan Xu2, W A. Grissom3, Ileana Hancu1, Mika W. Vogel4

1GE Global Research, Niskayuna, NY, United States; 2Applied Science Laboratory, GE Healthcare, Waukesha, WI; 3Department of Electrical Engineering and Radiology, Stanford University, Stanford, CA; 4GE Global Research, Munich, Bavaria, Germany

We demonstrate that the time-reversed RF concatenation principle, which was previously considered in one-dimensional non-adiabatic inversion pulse design, can be extended to multi-dimensional and multi-coil excitation pulses. We present general analytical formulation of the concatenation principle, and demonstrate its use in (i) simulated inversion in 8-channel parallel transmit, and (ii) in-vivo inversion experiment on a single channel system with a human subject. The off-resonance field sensitivity, which is a drawback of the concatenation method in one dimension, is significantly reduced for two-dimensional excitation when a spiral in- and out- trajectory is employed.