The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2018
Filed:
Sep. 24, 2012
Applicant:
Hitachi, Ltd., Tokyo, JP;
Inventor:
Munetaka Tsuda, Tokyo, JP;
Assignee:
HITACHI, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 33/38 (2006.01); G01R 33/389 (2006.01); G01R 33/3815 (2006.01); G01R 33/3875 (2006.01);
U.S. Cl.
CPC ...
G01R 33/3804 (2013.01); G01R 33/389 (2013.01); G01R 33/3815 (2013.01); G01R 33/3875 (2013.01);
Abstract
In order to extend the lifetime of a cooler and reduce down periods of an MRI apparatus due to the maintenance, a cooling capacity of the coolerof the superconducting magnet is controlled so that cooling heat absorption almost equivalent to an amount of heat penetrating into the refrigerant vesselof the superconducting magnet is exerted, and pressure in the refrigerant vesselis maintained within an acceptable pressure range. In addition to this, at least either change amount of magnetic field strength or magnetic field homogeneity in an imaging space due to a pressure change in the refrigerant vesselis compensated by the magnetic field adjustment unit.