Mapping eddy current fields in mri system
AssigneesToshiba Medical Systems Corporation, Kabushiki Kaisha Toshiba
InventorsAndrew J. Wheaton, Wayne R. Dannels
Life of this patent
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Abstract
Eddy current fields in a magnetic resonance imaging (MRI) system are mapped by acquiring MRI data from an object located in an imaging volume of the MRI system. An MRI data acquisition sequence is preceded by a pre-sequence including (a) a gradient magnetic field transition that stimulates eddy current fields in the MRI system, and (b) a spatial modulation grid tag module that sensitizes a spatially resolved MR image of the acquired MRI data to the stimulated eddy current fields that existed during the spatial modulation grid tag module. The eddy-sensitized MR image is processed to calculate a spatially resolved map of fields produced by the eddy currents.
Claims20
A method for mapping eddy current fields in a magnetic resonance imaging (MRI) system, said method comprising:
- using an MRI system to acquire and store MRI data from an object located in an imaging volume of the MRI system using an MRI data acquisition sequence which is preceded by a pre-sequence comprising (a) a gradient magnetic field transition which stimulates eddy current fields in the MRI system, and (b) a spatial modulation grid tag module which sensitizes a spatially resolved MR image of the acquired MRI data to the stimulated eddy current fields which existed during the spatial modulation grid tag module.
An MRI system comprising:
- an MRI scanner configured to acquire and store MRI data from an object located in an imaging volume of the MRI system using an MRI data acquisition sequence which is preceded by a pre-sequence comprising (a) a gradient magnetic field transition which stimulates eddy current fields in the MRI system, and (b) a spatial modulation grid tag module which sensitizes a spatially resolved MR image of the acquired MRI data to the stimulated eddy current fields which existed during the spatial modulation grid tag module.
Dependencies are inferred from the claim text.