Patent ID: 9606205
Date: 2017-03-28
CPC Classifications: G01R

Claim:
1. A magnetic resonance imaging apparatus comprising: an imaging unit configured to include a transmission coil of a plurality of channels radiating high frequency pulses from the plurality of channels and collect NMR signals using the high frequency pulses which include a preliminary RF pulse exciting a first region of an object and an excitation RF pulse exciting a second region different from the first region; and a shimming parameter calculation unit configured to calculate shimming parameters for adjusting radiation magnetic field distributions generated by the high frequency pulses radiated from the plurality of channels, wherein the shimming parameter calculation unit calculates, as the shimming parameter for the preliminary RF pulse, a first shimming parameter different from a second shimming parameter which is a shimming parameter set for the excitation RF pulse so that the radiation magnetic field distribution generated in the first region by the preliminary RF pulse is smaller in a radiation magnetic field of a first part than in a radiation magnetic field of a second part, by repeatedly performing calculation under a constraint condition that an average value of the radiation magnetic field distribution in the second part is not changed, and wherein the imaging unit performs imaging using the preliminary RF pulse adjusted with the first shimming parameter and the excitation RF pulse adjusted with the second shimming parameter.