Title:
【発明の名称】内部スペースを含む短い均一界磁を有する磁気共鳴装置
Document Type and Number:
Japanese Patent JP2002527168
Kind Code:
A
Abstract:
In an MRI apparatus for medical purposes it is desirable to minimize the length of the magnet system for generating the main field, inter alia in order to keep the accessibility of the region to be examined in the imaging volume as high as possible for the attending staff. In order to save costs it is also desirable to make the diameter of the magnet system as small as possible. According to the invention a short, actively shielded magnet system is obtained in that the turns of the magnet system are situated in an imaginary U-shaped space 43 with the opening of the U facing the axis 35. The current component in the bottom 37 of the U has a value which is smaller than that of the current component in the limbs 47a, 47b of the U. The inner space 49 of the U does not contain a current for generating a contribution to the main field in the measuring space 29 of the apparatus. Consequently, a free inner space is formed in the magnet system; this free space can be used, for example to accommodate gradient coils and/or RF coils.
Inventors:
Mulder, Heraldus Bay
Herrenduen, Pelen
Herrenduen, Pelen
Application Number:
JP2000576294A
Publication Date:
August 27, 2002
Filing Date:
October 11, 1999
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
G01R33/381; A61B5/055; G01R33/38; G01R33/3875; G01R33/421; (IPC1-7): A61B5/055; G01R33/381
Attorney, Agent or Firm:
Tadahiko Ito