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US 7,443,164 B2Granted
Methods and apparatus for measuring magnetic field homogeneity
AssigneeBoard of Regents, The University of Texas System
InventorsGeoffrey D. Clarke, Hua-Hsuan Chen, John W. Roby, III, Rex D. Boykin
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Abstract
In one embodiment, the present invention includes a method for obtaining magnetic resonance (MR) data of a phantom located in a magnetic resonance imaging (MRI) system with multiple bandwidths. The data may then be processed to determine magnetic field homogeneity of the MRI system.
Claims23
A phantom comprising:
- a spherical structure having a hollow interior;
- and
- a plurality of plates disposed within the hollow interior, at least three of the plates being substantially perpendicularly aligned, wherein each of the plurality of plates includes positional markers extending radially outwardly from a center of the plate in a hub and spoke manner,
- wherein the phantom is a landmark system for measuring main magnetic field homogeneity of a magnetic resonance imaging system.
1 more element
A method comprising:
- obtaining first magnetic resonance (MR) data of a phantom located in a magnetic resonance imaging (MRI) system at a first bandwidth;
- obtaining second MR data of the phantom located in the MRI system at a second bandwidth;
- obtaining the first MR data and the second MR data with phase-encoding and frequency-encoding directions switched;
- and
- processing the first MR data and the second MR data to determine magnetic field homogeneity (MFH) of the MRI system.
2 more elements
A system comprising:
- a processor to execute instructions;
- and
- a memory coupled to the processor, the memory including instructions to determine main magnetic field homogeneity (MFH) of a magnetic resonance imaging (MRI) system at multiple diameter spherical volumes (DSVs) from a single set of MR images.
Dependencies are inferred from the claim text.