Method for adjusting magnetic resonance imaging apparatus and superconductive magnet excitation dock

摘要

An adjustment method of a magnetic resonance imaging apparatus includes: a cooling and excitation step in which work of transporting a superconducting magnet to a facility different from a facility where the superconducting magnet is to be installed, cooling a superconducting coil of the superconducting magnet with a refrigerant, and supplying a current from an external power supply for excitation is repeated until a predetermined rated current flows; a demagnetization and transportation step of demagnetizing the superconducting coil and transporting the superconducting magnet to the facility where the superconducting magnet is to be installed in a state where the superconducting coil is cooled by the refrigerant; and an installation step of installing the superconducting magnet in the facility where the superconducting magnet is to be installed and supplying a predetermined rated current from an external power supply to the superconducting coil in order to excite the superconducting coil.

主权项

1. A dock for superconducting magnet excitation comprising:
a plant for condensing helium gas to liquid helium; a frame on which a superconducting magnet is mounted; a supply pipe used to send liquid helium from the plant to the superconducting magnet; at least two recovery pipes, with different diameters, to send helium gas from the superconducting magnet to the plant; a power supply for supplying an excitation current to the superconducting magnet; and a power lead which connects the power supply to the superconducting magnet; a constant-pressure valve, which is opened when the pressure in the recovery pipe exceeds predetermined pressure, provided in the recovery pipe with the larger diameter; and a fan for diffusing helium gas emitted when the constant-pressure valve is opened, wherein the recovery pipe with a larger diameter connected to an emergency exhaust hole for exhausting helium gas, which evaporates in the superconducting magnet in the event of a quench, to the outside.