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:
Feb. 02, 1988
Filed:
May. 11, 1987
Wolfgang Muller, Karlsruhe, DE;
Gunther R Laukien, Rheinstetten, DE;
Abstract
An electromagnet system for nuclear spin tomography comprises a ferromagnetic yoke (41), two pole pieces (42, 43) arranged on the said yoke (41) with their pole faces (51, 52) facing each other, and at least one excitation coil (47, 48). The pole pieces (42, 43) delimit an air gap (44) having a diameter-to-width ratio of less than 2.5. There is arranged in the area of each of the pole faces (51, 52) formed by the pole pieces (42, 43) at least one substantially two-dimensional supplementary coil (55, 56, 57, 58) whose number of ampere turns is between 0.1% and 10% of the number of ampere turns of the excitation coil (47, 48). The excitation and supplementary coils generate together in the air gap (44) a magnetic field (B) which exhibits a homogeneity better than 10.sup.-4 in a spherical volume having a diameter equal to half the value of the width (H) of the air gap.