Abstract #3952

Time optimal control based design of robust inversion pulses

Christina Graf¹, Martin Soellradl¹, Armin Rund², Christoph Stefan Aigner³, and Rudolf Stollberger¹

¹Graz University of Technology, Institute of Medical Engineering, Graz, Austria, ²Institute of Mathematics and Scientific Computing, University of Graz, Graz, Austria, ³Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Berlin, Germany

The aim of this work is to design short and B₀- and B₁-robust inversion pulses by optimal control. A time-optimal control framework is used that incorporates variations within B₀- and B₁-fields. The optimized RF pulse is compared numerically to two hyperbolic-secant pulses and shows a very good efficiency over a broad set of B₀-offsets and B₁-scalings. Two phantom measurements are performed on a 3T MRI system for various scalings of B₁ that verify the results, one with a cylindrical MRI phantom, the other one with oil and water with a contrast agent, demonstrating also the B₀-robustness of the proposed pulse.

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