METHOD AND APPARATUS FOR PRODUCING HOMOGENEOUS MAGNETIC FIELDS
First Claim
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1. A method for shimming a magnetic field in which there is an inhomogeneity having more than one geometrical component, the magnetic field being produced by a magnet assembly, the method comprising:
- applying a plurality of coordinately modulated single shim currents along corresponding ones of a plurality of substantially commonly oriented shim paths, a portion of each shim path located within the magnet assembly; and
suppressing the more than one geometrical component of the inhomogeneity in the magnetic field using the plurality of shim currents.
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Abstract
A method for shimming a magnetic field is disclosed. The method uses a single shim current to contribute to suppression of more than one geometrical component of an inhomogeneity in the magnetic field without changing the geometry of the shim path. Apparatuses to implement the method are also disclosed. In embodiments the apparatuses comprise substantially commonly oriented shim paths.
111 Citations
19 Claims
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1. A method for shimming a magnetic field in which there is an inhomogeneity having more than one geometrical component, the magnetic field being produced by a magnet assembly, the method comprising:
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applying a plurality of coordinately modulated single shim currents along corresponding ones of a plurality of substantially commonly oriented shim paths, a portion of each shim path located within the magnet assembly; and suppressing the more than one geometrical component of the inhomogeneity in the magnetic field using the plurality of shim currents. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A detector for detecting magnetic resonance in a sample exposed to a main magnetic field, the detector comprising:
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a substantially flat shim panel having two ends; and a plurality of shim paths having a substantially common orientation extending between the two ends, the shim paths for applying shim currents thereon. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A shim panel having first and second substantially distanced ends and a substantially flat portion comprising a plurality of shim paths each substantially extending between said ends, wherein individual ones of the shim paths:
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a) comprise substantially straight regions separated by an abrupt change of direction of the path;
orb) are substantially parallel over at least a portion of their length;
orc) have a substantially common orientation. - View Dependent Claims (17, 18)
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19. The detector according to claim 19 wherein the shim panel comprises a printed circuit board.
Specification