Patents by Inventor Aart J. Mateboer

Aart J. Mateboer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • MRI apparatus with a mechanically integrated eddy current shield in the gradient system
    Patent number: 6326788
    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.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: December 4, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus B. J. Mulder, Cornelis L. G. Ham, Aart J. Mateboer, Nicolaas B. Roozen, Johannes P. M. Verbunt