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:
May. 21, 2002
Filed:
Nov. 06, 2000
Arno Nauerth, Erlenbach, DE;
Bruker Medical GmbH, Rheinstetten, DE;
Abstract
The invention concerns a method of correcting field inhomogeneities of higher order in a magnetic resonance apparatus After an excitation pulse and action of a phase gradient in a predetermined direction p, a data point is recorded after two predetermined times t and t . This is repeated for systematically modified strengths of the phase gradient and constant t and t , and two sets of signal dependences in the p direction are obtained. The two phase dependences of the two Fourier transformed data sets in the p direction are subtracted. The profile of the difference phase in the p direction corresponds to a field error profile. The method is repeated for several p directions, and coefficients of higher order of a series expansion of the field inhomogeneities in spherical harmonic functions are obtained.