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Abstract #0101

Fast High-Flip PTx Pulse Design to Mitigate B1+ Inhomogeneity Using Composite Pulses at 7T

Rene Gumbrecht1,2, Joonsung Lee1, Hans-Peter Fautz3, Dirk Diehl4, Elfar Adalsteinsson1,5

1Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States; 2Department of Physics, Friedrich-Alexander-University, Erlangen, Germany; 3Siemens Healthcare, Erlangen, Germany; 4Siemens Corporate Technology, Erlangen, Germany; 5Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, United States

Parallel RF transmission offers flexible control of ma magnetization generation and has been successfully applied at 7T for spatially tailored excitations and mitigation of in-plane B1+ inhomogeneity for slice-selection. Composite Pulses are known to have favorable robustness properties for large-flip-angle excitations in the presence of B1+ variations, but they have not yet been demonstrated on pTx systems. We propose a composite RF pulse design for pTx systems and demonstrate the method for B1+ mitigation in a 90 excitation pulse design.