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. 12, 2001
Filed:
Nov. 05, 1998
Jürgen Hennig, Freiburg, DE;
Other;
Abstract
A method for magnetic resonance imaging (NMR) subjects a sample of magnetic spins, having differing Larmor frequencies and located in an external magnetic field, to a sequence of at least two radio frequency pulse sequences in time separation tm with respect to each other, wherein the difference in Larmor frequencies is due to the type of nuclei, to the inhomogeneities of the magnetic field utilized, or through action of an additional magnetic field gradient and wherein the first radio frequency pulse sequence effects excitation of, relative to the distribution of Larmor frequencies, periodic modulation of the z-magnetization having a modulation separation 2&Dgr;&ohgr; and the second radio frequency pulse sequence transfers this periodic modulating z-magnetization into transverse magnetization leading to signal production. The method is characterized in that at least one of the radio frequency pulse sequences utilized has a periodic rectangular excitation shape having a modulation separation 2&Dgr;&ohgr; so that, following a certain time determined by the modulation separation 2&Dgr;&ohgr;, at least a partial coherence of transverse magnetization results and thereby a measurable NMR signal. In this manner, an improved stimulated echo signal can be created.