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. 22, 1998
Filed:
Mar. 17, 1997
Johannes P Groen, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a magnetic resonance method for imaging a part of a body which is arranged in a steady magnetic field, magnetic resonance signals are measured utilizing an initial read gradient and an alternating read gradient. The method can be used, for example for phase contrast angiography and for flow velocity measurements in a body of a patient. In order to counteract artifacts in the image due to inhomogeneities of the steady magnetic field, the time elapsing between an excitation RF pulse exciting spins in the part of the body and the initial read gradient is varied in successive pulse sequences. However, this causes artifacts in the fluid flow images due to the phase error which itself is caused by the spins flowing in the direction of the gradient field. In order to counteract these artifacts, the first-order moment of the initial read gradient and a first order lobe of the alternating read gradient is kept substantially constant in each pulse sequence.