Abstract #3397

Optimal control based design of parallel transmission RF pulses with minimum local SAR

Armin Rund¹, Christoph Stefan Aigner², Lena Nohava³, Roberta Frass-Kriegl³, Elmar Laistler³, Karl Kunisch^1,4, and Rudolf Stollberger²

¹Institute for Mathematics and Scientific Computing, University of Graz, Graz, Austria, ²Institute of Medical Engineering, Graz University of Technology, Graz, Austria, ³Division MR Physics, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria, ⁴Johann Radon Institute for Computational and Applied Mathematics (RICAM), Austrian Academy of Sciences, Linz, Austria

An optimal control framework for designing parallel transmission RF pulses and gradient shapes is introduced. The optimal control model includes technical constraints and a local SAR model based on the Q-matrix formalism. Second-order optimization methods give RF pulses with enhanced homogeneity of the excitation pattern and/or decreased local SAR. The optimized results are tested in numerical experiments and validated with numerical electromagnetic simulations.

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