Time optimal control-based RF pulse design under gradient imperfections.

ABSTRACT:

Purpose

This study incorporates a gradient system imperfection model into an optimal control framework for radio frequency (RF) pulse design.

Theory and methods

The joint design of minimum-time RF and slice selective gradient shapes is posed as an optimal control problem. Hardware limitations such as maximal amplitudes for RF and slice selective gradient or its slew rate are included as hard constraints to assure practical applicability of the optimized waveforms. In order to guarantee the performance of the optimized waveform with possible gradient system disturbances such as limited system bandwidth and eddy currents, a measured gradient impulse response function (GIRF) for a specific system is integrated into the optimization.

Results

The method generates optimized

SUBMITTER: Aigner CS 

PROVIDER: S-EPMC6899978 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature