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Abstract #3093

Droop compensation of gradient current waveforms in gradient array systems

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

Providing accurate gradient currents is challenging due to the nonlinearity of the gradient system arising from gradient power amplifiers and power supply stages which causes droop in the output currents. This work introduces a nonlinear model for the gradient array system by using the state-space averaging technique and the nonlinear inversion of the model compensates for droop. The feasibility of the method is depicted by simulation and experimental results. The proposed method can provide desired currents by lower voltages which results in minimizing the needed power. It is also possible to use small capacitors to lower the cost of system.

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