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:
Oct. 15, 2013
Filed:
Apr. 14, 2010
Zhenyu Liu, Freiburg, DE;
Feng Jia, Freiburg, DE;
Jan Gerrit Korvink, Karlsruhe, DE;
Albert-Ludwigs-Universitaet Freiburg, Freiburg, DE;
Abstract
A method for designing an electromagnetic gradient coil for magnetic resonance imaging systems. The method includes the steps of: choosing a set of objectives L, whereby the objectives Lare combined to one weighted-sum objective function; choosing a design variable ψ for modifying the value of the objectives L; making an initial guess of the value of the design variable ψ; simulating the magnetic field in a computational domain with respect to the distribution of the surface current density; carrying out a sensitivity analysis by calculating a sensitivity vector G=∂L/∂ψ; updating the design variable ψ, whereby the value of the design variable ψ is changed in order to decrease the value of the objective L; determining whether convergency is achieved by either determining whether the value of the objective function does not decrease or the whether the Euclidian norm of the sensitivity vector G approximate to zero; and reconstruction of a discretized coil. The simulation of the magnetic field in a computational domain is effected using a least square finite element analysis. The steps are repeated prior to reconstruction of a discretized coil until convergency is achieved. An effective and improved design for irregular surfaces is thereby created.