| 摘要 |
Within upper and lower cryostats 17 and 18 for a super conducting magnet 2 level sensor 215 and 216 which measure respective amounts of liquid helium 212 therein are assembled and are connected to a measuring circuit 23. When a control signal of a computer 10 is provided to the measurement circuit 23 via the sequencer 9, the measurement circuit 23 performs automatic measurement of remaining amount of liquid helium 212 and the measured data is transferred to the computer 10. The computer 10 records the measured data as well as performs computation processing thereof and causes a display unit 12 to display the processing result as an effective management parameter of the liquid helium. Thereby, an open type MRI apparatus using a super conducting magnet with liquid helium monitoring system which is suitable for maintenance and management of liquid helium for the super conducting magnet can be provided.
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