Magnetic resonance apparatus with a coil system optimized for noise reduction and method for designing the coil system
AssigneeSiemens Aktiengesellschaft
InventorMatthias Gebhardt
Life of this patent
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Abstract
A magnetic resonance apparatus has a basic field magnet system for generating a basic magnetic field and a coil system with a coil arrangement, wherein a course of a current-carrying conductor of the coil arrangement for generating a predetermined target magnetic field is determined according to a method that allows for linear secondary conditions. A noise-causing mechanical oscillation of the coil system as a result of Lorentz forces that act on the current-carrying conductor in the basic magnetic field is thereby taken into consideration by one of the linear secondary conditions, and the course of the conductor is additionally determined by the method so that the noise-causing oscillation is diminished.
Claims9
A magnetic resonance apparatus comprising:
- a basic field magnet system for generating a basic magnetic field;
- a coil system having a coil arrangement with at least one current-carrying conductor said coil system being subject to mechanical oscillations resulting from Lorentz forces acting on said current-carrying conductor in said basic magnetic field;
- and
- said at least one current-carrying conductor following a path for simultaneously generating a predetermined target magnetic field and for reducing at least one of said mechanical oscillations which is a mechanical oscillation which contributes to said noise.
A method for designing a gradient coil system for a magnetic resonance apparatus, said magnetic resonance apparatus having a basic field magnet system for generating a basic magnetic field and said coil system having a coil arrangement with a layer in which a current-carrying conductor, following a path in said layer, is disposed, and wherein said coil system is subject to mechanical oscillations resulting from Lorentz forces acting on said current-carrying conductor in said basic magnetic field, said method comprising the steps of:
- determining said path of said current-carrying conductor in said layer for generating a predetermined target magnetic field using a calculation procedure which encompasses linear secondary conditions;
- identifying at least one of said mechanical oscillations which is a noise-causing mechanical oscillation and representing said noise-causing mechanical oscillation as one of said linear secondary conditions which is encompassed in said calculation procedure;
- and
- determining said path of said current-carrying conductor in said layer using said calculation procedure to simultaneously generate said predetermined target magnetic field and to reduce said noise-causing mechanical oscillation.
Dependencies are inferred from the claim text.