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Abstract #4443

RF Energy Reduction by Parallel Transmission using Large-Tip-Angle Composite Pulses

Rene Gumbrecht1,2, Elfar Adalsteinsson3,4, Paul Mller2, Hans-Peter Fautz1

1Siemens Healthcare, Erlangen, Germany; 2Department of Physics, Friedrich-Alexander University, Erlangen, Germany; 3Electrical Engineering & Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States; 4Harvard-MIT Division of Health Sciences & Technology, Massachusetts Institute of Technology, Cambridge, MA, United States

For ultra high field strengths of 7T and above, peak RF power and SAR are limiting factors for high performance imaging. One way to keep these quantities low is to prolong the RF pulses. However, long RF pulses are prone to B0 homogeneities because the bandwidth of such pulses is reduced. In this work, we investigate the potential of prolonging large-tip-angle composite RF pulses for power and SAR reduction by using pTx pulse design methods which account for local B0 field variations.