Patent ID: 8362773

Claim:
A magnetic resonance imaging (MRI) apparatus comprising: an MRI system having: a magnet configured to generate a magnetic field; a plurality of gradient coils; and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images; and a computer programmed to: acquire a pulse sequence to be applied during an MR scan; determine a power spectrum of a plurality of gradient pulses of the pulse sequence; calculate a drift of the magnetic field attributable to application of the plurality of gradient pulses by the plurality of gradient coils during application of the pulse sequence; apply the pulse sequence during the MR scan; acquire MR data based on application of the pulse sequence; correct the acquired MR data based on the calculated drift of the magnetic field; and reconstruct an image based on the corrected MR data.