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Abstract #4929

Large Tip Angle Parallel Excitation Using Nonlinear Non-Bijective PatLoc Encoding Fields

Martin Haas1, Peter Ullmann2, Johannes T. Schneider, 1,2, Wolfgang Ruhm2, Jrgen Hennig1, Maxim Zaitsev1

1Dept. of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany; 2Bruker BioSpin MRI GmbH, Ettlingen, Germany

The nonlinear non-bijective "PatLoc" fields recently proposed for anatomically tailored readout encoding are examined in combination with RF transmission for 2D spatially selective excitation. It is shown that parallel transmission is necessary to resolve encoding ambiguities but that PatLoc encoding allows for higher resolution magnetization patterns to be generated locally as compared to conventional linear encoding fields. The RF pulse design is based on the optimal control algorithm introduced by D. Xu et al. MRM 59, 547 (2008), which has been generalized to the regime of nonlinear non-bijective encoding fields.