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Abstract #4927

Bloch Simulation Acceleration for Fast Pulse Design in Parallel Transmit

Seung-Kyun Lee1, Dan Xu2, Silke M. Lechner3,4, Mika W. Vogel3

1GE Global Research, Niskayuna, NY, United States; 2Applied Science Laboratory, GE Healthcare, Waukesha, WI; 3Advanced Medical Applications Laboratory, GE Global Research, Munich, Bavaria, Germany; 4Department of Scientific Computing in Computer Science, Technical University Munich, Munich, Bavaria, Germany

Analytical and computational methods are presented to accelerate Bloch simulation for optimal control-based RF pulse design in parallel transmit. In the first method, the cost and steepest descent calculation in optimal control theory is performed in a frame of reference in which local longitudinal magnetic fields are transformed away analytically. In the second method we demonstrate an order-of-magnitude enhancement in iterative calculation speed as we shift the calculation load from the conventional Central Processing Unit to a Graphics Processing Unit. Both methods were tested in simulated 8-channel pTx pulse design.