The gradient amplifier is an essential equipment of Magnetic Resonance Imaging system (MRI). It supplies the gradient coils with pulse currents according to the signal from the control system.

梯度放大器是核磁共振成像(MRI)系统的核心设备之一，它根据前级控制系统传来的指令，向梯度线圈提供特定波形的电流脉冲。

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Eddy currents will be caused in ambient conducting parts because of the rapid switch speed of current pulse in gradient coils.

梯度线圈中的脉冲电流具有很高的切换速度，这必然会在周围导电部件中引起涡流。

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Furthermore, the gradient coils' design for the newly proposed permanent MRI system is a special inverse problem of electromagnetic field.

对于上述新型永磁mri系统，梯度线圈的设计更是一个特殊的电磁场逆问题。

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