Patent ID: 7994787

Claim:
A magnetic resonance imaging apparatus comprising a superconducting magnet which has a cryostat involving a superconducting coil for generating a static magnetic field and a refrigerant to cool the superconducting coil, a cryo-cooler being incorporated in the cryostat for recondensing the refrigerant being vaporized, a heater for providing heat to the cryostat, and a pipe for discharging gas vaporized from the refrigerant to the outside, wherein, the magnetic resonance imaging apparatus further comprises a heating value controller for controlling a heating value of the heater so as to reduce discharging amount of the gas, based on a gas flow rate having been measured by a gas flow measuring device being connected to the pipe, the gas flow measuring device controlling the gas flowing in the pipe to be at a constant pressure to measure the gas flow rate.