Patent ID: 8723523

Claim:
A magnetic resonance imaging apparatus, comprising: a pair of static magnetic field generators separately disposed at the top and bottom of an imaging space in which a subject is placed; a shim magnetic material, disposed on the imaging-space side of each of the pair of static magnetic field generators, configured for generating a magnetic field and thereby adjusting the static magnetic field; a gradient magnetic field generator; a high-frequency magnetic field generator; a temperature sensor configured for measuring the temperature of the gradient magnetic field generator in order to predict the temperature change of the shim magnetic material; and a controller configured for controlling the gradient magnetic field generator and the high-frequency magnetic field generator and for executing an imaging pulse sequence, wherein the controller determines the inhomogeneity of the static magnetic field from the output of the temperature sensor, considers the change in the magnetic field generated by the shim magnetic material due to the temperature change of the shim magnetic material, and causes a warning message to be presented when the controller determines that the determined static magnetic field inhomogeneity has exceeded a predetermined allowable value.