Title:
SUPERCONDUCTING MAGNET, MAGNETIC RESONANCE IMAGING UNIT, AND METHOD OF CALCULATING COOLING CAPACITY OF CRYO-COOLER
Document Type and Number:
WIPO Patent Application WO/2008/007574
Kind Code:
A1
Abstract:
An MRI unit for controlling liquid helium consumption and constantly generating
static magnetic field by recognizing the heat quantity entering a helium tank
of a superconducting magnet and selecting a cryo-cooler to be combined. The superconducting
magnet is provided with a means of measuring the flow rate of refrigerant gas flowing
out from a container with a pressure inside the container housing a superconducting
coil and refrigerant kept constant, and determines heat quantity entering the
container and the cooling capacity of a cooling unit by using this flow rate. When
heat quantity entering the container and the cooing capacity of a cooling unit
are accurately measured, a cooling unit having a cooling capacity large enough
to accommodate entering heat quantity can be combined.
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Inventors:
TSUDA MUNETAKA (JP)
Application Number:
PCT/JP2007/063225
Publication Date:
January 17, 2008
Filing Date:
July 02, 2007
Export Citation:
Assignee:
HITACHI MEDICAL CORP (JP)
TSUDA MUNETAKA (JP)
TSUDA MUNETAKA (JP)
International Classes:
A61B5/055; H01F6/04; H01L39/04
Foreign References:
| JPH0669030A | 1994-03-11 | |||
| JPH05172924A | 1993-07-13 | |||
| JPS63232305A | 1988-09-28 | |||
| JP2002209872A | 2002-07-30 | |||
| JPH08306971A | 1996-11-22 | |||
| JPH0652160U | 1994-07-15 |
Attorney, Agent or Firm:
TADA, Kimiko et al. (6-15 Kasumigaseki 3-chom, Chiyoda-ku Tokyo 13, JP)
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