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US 9,851,423 B2Granted
Patient-adaptive B0 homogenization of MR systems using different types of shim coils
AssigneeSiemens Aktiengesellschaft
InventorsStephan Biber, Ralf Ladebeck
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Abstract
The embodiments relate to methods and to magnetic resonance tomography systems having a shim system, where the shim system includes at least one global shim coil in an area surrounding the bore of the magnetic resonance tomography system, and where the shim system includes a local shim coil in a local coil of the magnetic resonance tomography system with a shim controller, where the shim controller embodied to define shim currents for the global shim coil and for the local shim coil.
Claims27
A magnetic resonance tomography (MRT) system comprising:
- a shim system comprising:
- at least one global shim coil in an area surrounding a bore of the magnetic resonance tomography system;
- at least one local shim coil in a local coil of the magnetic resonance tomography system;
- and
- a shim controller configured to determine global shim currents for the global shim coil and local shim currents for the local shim coil,
- wherein the shim controller is configured to determine the global shim currents and the local shim currents using a three-dimensional linear combination of shim fields created with the at least one global shim coil and the at least one local shim coil with an optimization method for searching for a minimization of the basic field inhomogeneity caused by the shim currents of the at least one global shim coil and the at least one local shim coil.
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Dependencies are inferred from the claim text.