Abstract #1891

Low SAR RF-pulse design by joint optimization of RF and gradient shape with physical constraints

Christoph Stefan Aigner^1,2, Christian Clason³, Armin Rund⁴, and Rudolf Stollberger^1,2

¹Institute of Medical Engineering, Graz University of Technology, Graz, Austria, ²BioTechMed Graz, Graz, Austria, ³Faculty of Mathematics, University of Duisburg-Essen, Essen, Germany, ⁴Institute for Mathematics and Scientific Computing, University of Graz, Graz, Austria

We demonstrate the joint optimization of RF and slice selective gradient shapes with hard constraints such as peak B1 of the pulse and peak slew rate of the gradient via a flexible approach based on optimal control of the full time-dependent Bloch equation and a novel semi-smooth Newton method. The presented approach allows optimization on a fine spatial and temporal grid while enforcing physical and technical limitations on the control variables. The results are validated on a 3T scanner, demonstrating the practical realizability of the presented approach even for short RF pulses.

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