Meeting Banner
Abstract #2397

SAR reduced excitation by joint design of RF pulse and slice selective gradient shape

Christoph Stefan Aigner 1 , Christian Clason 2 , Armin Rund 3 , and Rudolf Stollberger 1

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

Radio frequency (RF) pulses are essential in MRI to excite and alter magnetization. We present a flexible approach based on optimal control of the full time-dependent Bloch equation for joint optimization of RF pulse and slice selective gradient. A globally convergent trust-region Newton method with exact derivatives via adjoint calculus allows the efficient computation of optimal pulses. The results are validated on a 3T scanner and demonstrate the ability to generate optimized waveforms for large flip angles with highly reduced RF power.

This abstract and the presentation materials are available to members only; a login is required.

Join Here