Title:
MRI SYSTEM
Document Type and Number:
WIPO Patent Application WO/2014/203827
Kind Code:
A1
Abstract:
This MRI device (10) has: a dewar (12) that houses liquid helium; a superconducting magnet disposed in the dewar (12); and a heat shield (16) disposed in a manner so as to encircle the dewar (12). A cold chamber (40) includes: a freezer first stage (42) that generates low-temperature helium gas from high-temperature helium gas; and a freezer second stage (44) that generates liquid helium from the ultralow-temperature helium gas. A transfer tube (90) provided with a heat exchanger (22) conveys the liquid helium and helium gas. The present invention has: a cooled helium gas transfer tube that supplies cooled helium gas obtained from the freezer first stage through the inside of the transfer tube (90) to the heat exchanger (22) and cools the heat shield; and a high-temperature helium gas transfer tube that transfers helium gas that has been warmed by the heat shield in the heat exchanger (22) to the freezer first stage.
Inventors:
TAKEDA TSUNEHIRO (JP)
Application Number:
PCT/JP2014/065763
Publication Date:
December 24, 2014
Filing Date:
June 13, 2014
Export Citation:
Assignee:
FRONTIER TECHNOLOGY INST INC (JP)
International Classes:
A61B5/055; H01F6/04
Foreign References:
| JP2003303713A | 2003-10-24 |
Other References:
TSUNEHIRO TAKEDA ET AL.: "An Efficient Helium Circulation System with Small GM Cryocoolers", CRYOGENIC ENGINEERING, vol. 43, no. 4, 25 May 2008 (2008-05-25), pages 174 - 179
Attorney, Agent or Firm:
YKI Patent Attorneys (JP)
Patent business corporation YKI international patent firm (JP)
Patent business corporation YKI international patent firm (JP)
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