Magnetic resonance imaging apparatus having continuous readout gradient with gradient slew rate changed

摘要

A magnetic resonance imaging apparatus according to an embodiment includes a sequence control unit that controls a gradient magnetic field power supply, thereby performing a pulse sequence including the application of a continuous readout gradient magnetic field pulse. The sequence control unit controls the gradient magnetic field power supply such that the slew rate of the gradient magnetic field pulse is reduced in stages as the output voltage of a gradient magnetic field amplifier is reduced in stages.

主权项

1. A magnetic resonance imaging apparatus comprising:
a gantry, static and gradient magnetic field generators, at least one radio frequency (RF) coil coupled to an imaging volume, RF transmitter and RF receiver circuitry coupled to the at least one RF coil, and a gradient magnetic field power supply including a gradient magnetic field amplifier coupled to the gradient magnetic field generators; and processing circuitry configured to: A) specify a waveform of a continuous readout gradient magnetic field pulse with a slew rate of the waveform being reduced according to a stepwise reduction in an output voltage of the gradient magnetic field amplifier; and B) perform an MRI pulse sequence including the application of the continuous readout gradient magnetic field pulse having the specified waveform of step A) with the processing circuitry also controlling the gradient magnetic field power supply.