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:
Mar. 18, 2014
Filed:
Oct. 26, 2007
Nicolas Boulant, Giflyvette, FR;
Nicolas Boulant, Giflyvette, FR;
Commissariat a l'Energie Atomique et aux Energies Alternatives, Paris, FR;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A method of performing nuclear magnetic resonance imaging of a body (B), comprising: immerging said body in a static magnetic field B0 for aligning nuclear spins along a magnetization axis; exposing it to a transverse radio-frequency pulsed field Bi for flipping said nuclear spins by a predetermined angle; and detecting a signal emitted by flipped nuclear spins; the method being characterized in that it comprises the preliminary steps of: (i) determining a statistical distribution of the amplitude of said radio-frequency pulsed field within a volume of said body; and (ii) computing a set of optimal parameters of a composite radio-frequency pulsed field for jointly minimizing the dispersion of the spin flip angles distribution within said volume of the body, due to B1 and possibly B0 inhomogeneities, and the errors between the actual spin flip angles and their predetermined target value, wherein said radio-frequency pulsed field consists of a train of elementary pulses having a constant frequency and amplitude, and a continuous phase, and said parameters comprise: the number of said elementary pulses, as well as the duration, amplitude, frequency and relative initial phase of each of them.