Reza Babaloo1,2, Soheil Taraghinia2, and Ergin Atalar1,2
1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, 2National Magnetic Resonance Research Center (UMRAM), Ankara, Turkey
1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, 2National Magnetic Resonance Research Center (UMRAM), Ankara, Turkey
This work represents
the gradient array system with a nonlinear model and utilizing the inverse of the acquired model to regulate the gradient currents and compensate for the droop in a feed-forward open-loop configuration.
Fig.4. Experiment results. Comparison of the coils’ currents for the linear (uncompensated) and nonlinear (compensated) models. The reference inputs are trapezoid waveforms with 50A and 10A at the flat-top for ch-1 and ch-2, respectively. The rise time is the same for both channels (200μs).
Fig.1. (a) The circuit diagram of the two-channels gradient array. (b) The hardware setup including control card (VC707 evaluation board), custom-built GPAs and two channels array coils.
