Controlling gradient coils taking the inductive coupling into account

A gradient coil system of a magnetic resonance system, the gradient coil system comprising:

• a plurality of gradient coils;
• a gradient pulse generator operable to generate reference current signals for the plurality of gradient coils;
• controllers that are assigned to the plurality of gradient coils, the controllers being supplied with the respective reference current signal, wherein each of the controllers is supplied with an actual current signal that is characteristic of a current flowing in the respective gradient coil of the plurality of gradient coils, and wherein each of the controllers is operable to generate a control signal;
• and
• gradient power amplifiers that are assigned to the plurality of gradient coils, the controllers operable to drive the gradient power amplifiers in accordance with the control signals, wherein each of the gradient power amplifiers is operable to apply a current to the gradient coil assigned to the gradient power amplifier in accordance with the generated control signal,
• wherein each of the controllers is supplied with the reference current signal or the actual current signal of at least one other gradient coil of the plurality of gradient coils or the time derivative of the reference current signal or the actual current signal of at least one other gradient coil of the plurality of gradient coils,
• wherein each of the controllers is operable to generate the respective control signal on the basis of the respective reference current signal, the respective actual current signal and the time derivatives of the reference current signals or the actual current signals of the other gradient coils supplied to the controllers, and
• wherein the time derivatives of the reference current signals or the actual current signals of the other gradient coils supplied to the controllers are included in the generation of the respective control signal in accordance with the inductive coupling of the gradient coil assigned to the respective controller to the at least one respective other gradient coil.

A magnetic resonance system comprising:

• a base magnet;
• a gradient coil system;
• and
• at least one radio-frequency system,
• wherein the gradient coil system comprises:
• a plurality of gradient coils;
• a gradient pulse generator operable to generate reference current signals for the plurality of gradient coils;
• controllers that are assigned to the plurality of gradient coils, the controllers being supplied with the respective reference current signal, wherein each of the controllers is supplied with an actual current signal that is characteristic of a current flowing in the respective gradient coil of the plurality of gradient coils, and wherein each of the controllers is operable to generate a control signal;
• and
• gradient power amplifiers that are assigned to the plurality of gradient coils, the controllers operable to drive the gradient power amplifiers in accordance with the control signals, wherein each of the gradient power amplifiers is operable to apply a current to the gradient coil assigned to the gradient power amplifier in accordance with the generated control signal,
• wherein each of the controllers is supplied with the reference current signal or the actual current signal of at least one other gradient coil of the plurality of gradient coils or the time derivative of the reference current signal or the actual current signal of at least one other gradient coil of the plurality of gradient coils,
• wherein each of the controllers is operable to generate the respective control signal on the basis of the respective reference current signal, the respective actual current signal and the time derivatives of the reference current signals or the actual current signals of the other gradient coils supplied to the controllers, and
• wherein the time derivatives of the reference current signals or the actual current signals of the other gradient coils supplied to the controllers are included in the generation of the respective control signal in accordance with the inductive coupling of the gradient coil assigned to the respective controller to the at least one respective other gradient coil.