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.