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. 14, 1993
Filed:
Oct. 05, 1992
Johannes A Overweg, Eindhoven, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
A magnet system for generating a uniform magnetic field in an examination zone (5) in an accommodation space of magnetic resonance apparatus is formed by a first, approximately cylindrical electromagnetic coil system (1) which encloses the examination zone and which is symmetrically arranged relative to a symmetry axis (9) and relative to a asymmetry plane (11) extending perpendicularly to the symmetry axis, and a second, approximately cylindrical electromagnetic coil system (7) which is arranged so as to be symmetrical relative to the symmetry axis and relative to the symmetry plane and which is arranged so as to be concentric with the first coil system, the magnetic dipole moments of the first and the second coil system being oppositely directed and substantially equal. The first coil system (1) includes a central coil (13) which is symmetrically arranged relative to the symmetry plane (11) and two pairs of further coils (15, 17) which are symmetrically arranged relative to the symmetry plane, the second coil system (7) including a central coil (21) symmetrically arranged relative to the symmetry plane and a pair of further coils (23) symmetrically arranged relative to the symmetry plane. As a result, despite the use of only eight coils the magnet system generates a highly uniform central magnetic field and only a very small stray field.