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:
Sep. 21, 2004
Filed:
Aug. 01, 2000
Masaaki Aoki, Takatsuki, JP;
Shiego Hashimoto, Saga, JP;
Sumitomo Special Metals Co., Ltd., Osaka, JP;
Abstract
It is an object of the present invention to provide a magnetic field generator for MRI with which it is possible to lower the residual magnetism and eddy current within pole pieces generated by the effect of the pulse current flowing through Gradient magnetic field coils, without decreasing the field uniformity within the air gap. Pole pieces in which a main component consisting of laminated silicon steel sheets is effectively combined with a magnetic annular protrusion disposed on the side on the main component facing the air gap, the result of which is the formation of a static magnetic field having the desired uniformity within the air gap without leading to a state of magnetic saturation in the vicinity of the magnetic annular protrusion . This also makes possible a reduction in the residual magnetism and eddy current within the pole pieces generated by the effect of the pulse current flowing through Gradient magnetic field coils.