Mapping and Correction of Inhomogeneity in Magnetic Resonance Imaging Magnetic Field
AssigneeResonance Research, Inc.
InventorHoby P. Hetherington
Life of this patent
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Abstract
A system and method of mapping and correcting the inhomogeneity of a magnetic field within an object using an Magnetic Resonance Imaging (MRI) system where there is a single dominant resonance. The method includes acquiring at least three MRI images, each at different echo times (TE). At least two ΔTE images (ΔTEi=1 . . . N) are generated based on the at least three MRI images, wherein the subscripts I=1 . . . N refer to images with sequentially increasing ΔTE times. Aliasing in the ΔTE1 image is permitted. The ΔT times of ΔTE1 and ΔTE2 are set such that the alias points at which wrapping occurs in ΔTE1 does not overlap with the alias points of ΔTE2. Each ΔTE image is unwrapped. A final B0 map is set to the unwrapped ΔTEN image.
Claims2
A method for mapping and correcting the inhomogeneity of a magnetic field within an object using an Magnetic Resonance Imaging (MRI) system where there is a single dominant resonance, the method comprising:
- acquiring at least three MRI images, each at different echo times (TE):
- generating at least two ΔTE images (ΔTEi=1 . . . N) based on the at least three MRI images, wherein the subscripts i=1 . . . N refer to images with sequentially increasing ΔTE times:
- wherein aliasing in the ΔTE1 image is permitted, and wherein the ΔTE times of ΔTE1 and ΔTE2 are set such that the alias points at which wrapping occurs in ΔTE1 does not overlap with the alias points of ΔTE2;
- and
- unwrapping each ΔTE image;
- and
- setting a final B0 map to the unwrapped ΔTEN image.
A system for mapping and correcting the inhomogeneity of the magnetic field within an object using Magnetic Resonance Imaging (MRI) where there is a single dominant resonance, the system comprising:
- an MRI imaging device for acquiring at least three MRI images, each at different echo times (TE), wherein the MRI imaging device includes a controller configured to:
- generate at least two ΔTE images (ΔTEi=1 . . . N) based on the at least three MRI images, wherein the subscripts I=1 . . . N refer to images with sequentially increasing ΔTE times:
- wherein aliasing in the ΔTE1 image is permitted, and wherein the ΔTE times of ΔTE1 and ΔTE2 are set such that the alias points at which wrapping occurs in ΔTE1 does not overlap with the alias points of ΔTE2:
- unwrap each ΔTE image;
- and
- set a final B0 map to the unwrapped ΔTEN image.
Dependencies are inferred from the claim text.