Title:
内部アクティブ磁場キャンセレーションを有する磁気遮蔽ルーム及びその使用
Document Type and Number:
Japanese Patent JP2007534340
Kind Code:
A
Abstract:
An apparatus includes an enclosure having a wall defining an interior of the enclosure and having a layer of a magnetically permeable material disposed such that there is no layer of an electrically conductive material located closer to the interior of the enclosure than the layer of the magnetically permeable material. A background-field magnetometer and an electrical coil structure are positioned within the enclosure. The electrical coil structure is driven by a controllable electrical current source. A background-field-reducing feedback controller has a controller input responsive to a background-field magnetometer output signal, and a controller output in communication with the current source command signal input. A signal magnetometer, such as a biomagnetometer, within the enclosure detects a magnetic field produced by a source within the enclosure. The electrical coil structure operating responsive to the feedback controller reduces the background magnetic field within the enclosure, so that the signal magnetometer may operate in an environment having less interference.
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Inventors:
Scott Di Buchanan
Application Number:
JP2005507798A
Publication Date:
November 29, 2007
Filing Date:
July 29, 2003
Export Citation:
Assignee:
4-D NEUROIMAGING
International Classes:
A61B5/05; G01R33/025; H05K9/00
Attorney, Agent or Firm:
Masahiro Ishino
Kazuhisa Inaba
Kazuhisa Inaba