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.
Keywords