Patent ID: 6215309
Filing Date: 2001-04-10
Classification: G01R

Abstract:
A method of generating a magnetic field by delivering a gradient coil current to a gradient coil of a magnetic resonance imaging system, the method comprising the steps of:providing an output capacitor connected to the gradient coil, the output capacitor having a first and second connection, and having a capacitor voltage measured across the two connections;charging the output capacitor using a capacitor charging circuit;providing power from a power supply both to the capacitor charging circuit and directly to the gradient coil and output capacitor,the power supply being capable of delivering a time varying output current in a shape and amplitude controlled by an input signal to the power supply;measuring the capacitor voltage during charging and using the measured voltage to determine the input signal provided to the power supply when the power supply is driving the capacitor charging circuit; andmeasuring the gradient coil current during delivery of current to the gradient coil and using the measured current to determine the input signal provided to the power supply when the power supply is directly driving the gradient coil.