Title:
【発明の名称】勾配システム内に機械的に一体化された渦電流遮蔽を具備するMRI装置
Document Type and Number:
Japanese Patent JP2002528204
Kind Code:
A
Abstract:
The MRI apparatus includes an actively shielded gradient system (40) with primary gradient coils and shielding coils (56). Despite the active shielding, such a system inevitably causes a magnetic field to some extent outside the shielding, so that eddy currents are generated in the conductive structures of the main magnet, said eddy currents causing heat dissipation and annoying noise. According to the invention, the gradient system also includes an eddy current shield (48) which consists of an electrically conductive, substantially closed plate; furthermore, the primary gradient coil (60) and the shielding coil (56) are arranged within the eddy current shield (48) and these three elements together constitute a mechanically rigid unit. As a result, eddy currents are avoided in the main magnet and annoying noise is strongly reduced.
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Inventors:
Matebua, Aaltoye
Fluoroscan Imaging Systems, Inc.
Rosen, Nikolaas B
Felbund, Johannes Page
Andesh Ternstreme
Fluoroscan Imaging Systems, Inc.
Rosen, Nikolaas B
Felbund, Johannes Page
Andesh Ternstreme
Application Number:
JP2000578669A
Publication Date:
September 03, 2002
Filing Date:
October 04, 1999
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
G01R33/385; A61B5/055; G01R33/3873; G01R33/421; (IPC1-7): A61B5/055; G01R33/385; G01R33/3873
Attorney, Agent or Firm:
Tadahiko Ito