MRI GRADIENT AMPLIFIER OPERATING AT DIFFERENT RATES OF RISE

摘要

FIELD: electricity.;SUBSTANCE: voltage is applied at the first level to the output of the gradient amplifier by means of a power supply to generate a gradient current in the gradient coil in order to create a gradient magnetic field at a certain slew rate. The slew rate is set to the first value. Then it is reset to the second value. The second value is compared to the first value and the voltage is adjusted to the second level if the second value is different from the first value.;EFFECT: increase of the maximum RMS current.;13 cl, 4 dwg