Superconducting magnet, magnetic resonance imaging...

Details Superconducting magnet, magnetic resonance imaging... Superconducting magnet, magnetic resonance imaging...

Filed on

2011-08-09

Date issued

2011-08-09

Examiner

Shrivastav, Brij B (Department: 2858)

Patent Class

Electricity: measuring and testing

SubClass

Particle precession resonance

SubSubClass

Spectrometer components

Other Related Categories

C324S309000

Type

Reexamination Certificate

Status

active

Patent number

07994787

Description

ABSTRACT:
An MRI apparatus is provided in which a heat quantity penetrating into the helium tank of a superconducting magnet can be grasped to select a cryo-cooler to be incorporated, whereby consumption of liquid helium is suppressed and a static magnetic field is generated stably. The superconducting magnet includes a superconducting coil, containers209and203for accommodating the superconducting coil and a refrigerant, a cooler208for liquefy gas once again, the gas having been obtained by vaporizing the refrigerant in the containers, and a means for measuring the amount of vaporized refrigerant, while keeping the pressure in the containers at a constant level. The heat quantity penetrating into the containers and the coolability of the cooler are measured accurately, thereby enabling a combination in which the coolability of the cooler to be combined has capacity more than the heat penetration amount.

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CD-ROM of the specification and drawings annexed to the request of Japanese Utility Model Application No. 31721/1991 (Laid-open No. 52160/1994) (Shimadzu Corp.), Jul. 15, 1994.

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