Non-resonant gradient field accelerator

摘要

A gradient amplifier for an MRI system includes a low voltage amplifier and high voltage amplifier connected in series circuit with a gradient coil. A gradient current command pulse causes the low voltage amplifier to produce the desired coil current and the same command is differentiated to provide a voltage command for the high voltage amplifier which causes it to deliver power to rapidly build the gradient field at the beginning of the pulse and to remove power at the conclusion of the pulse. Two embodiments disclose different strategies for maintaining the high voltage power supply fully charged throughout a scan.