Abstract #3693

Inversion Pulses with B1-Robustness and Reduced Energy by Optimal Control

Christina Graf¹, Christoph Stefan Aigner², Armin Rund³, Andreas Johann Lesch¹, and Rudolf Stollberger¹

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

The aim of this work is to design slice-selective inversion RF pulses that are robust among $$$B1$$$-variations while the pulse energy is reduced. For that purpose, an optimal control framework based on an ensemble formulation is introduced. The numerically optimized RF pulses showed an excellent performance compared to the target magnetization for a broad range of $$$B1$$$-scalings. Phantom measurements were performed using a 32 channel head coil for receive and a birdcage body coil for transmit and revealed excellent inversion profiles.

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