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:
Jun. 16, 1987
Filed:
Nov. 06, 1985
Gunther Ries, Erlangen, DE;
Karl-Georg Heinzelmann, Neunkirchen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
The magnetic apparatus of a nuclear spin tomography system contains several magnet coils which are surrounded by an approximately hollow-cylindrical shielding device of ferromagnetic material. At each end face, this shielding device has a disc-shaped plate with a central opening. Four beam-like shielding elements of identical design having triangular or trapezoidal cross section, arranged distributed in the circumferential direction regularly on a common cylinder surface, extend between these plates at the end faces. With this magnetic apparatus, field distortions caused in the useful volume by the four beam-like shielding elements are substantially reduced. Each shielding element is extended in the outer regions of its base area facing the magnet coils to form a leg part extending toward the adjacent element which is spaced therefrom, which, together with the adjoining side surface of the shielding element, forms a common extended outside surface and has a predetermined thickness in the direction of the normal relative to this outside surface.