Determining and correcting for phase jumps
First Claim
Patent Images
1. A method of providing a continuous magnetic field map for magnetic resonance systems, said method including the steps of:
- acquiring a phase image comprising a plurality of elements corresponding to pixels,dividing the phase image into a plurality of subimages each comprising a plurality of said elements wherein the sizes of the subimages are sufficiently small to limit the phase spread of each of the subimages to being no more than 2π
, andphase unwrapping in each subimage by adding a selected modulo 2π
constant to each element of the subimage to provide said continuous map of the magnetic field.
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Abstract
A continuous phase magnetic field map is provided by dividing the field map of elements into regions; determining discontinuities in the regions and adding a constant modulo 2π to the phase values of each element of the region which results in a minimum difference between adjacent elements of the region. Then similarly joining the continuous regions to form continuous sections and the continuous sections to form continuous zones until substantially continuous phase magnetic field maps are obtained.
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Citations
16 Claims
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1. A method of providing a continuous magnetic field map for magnetic resonance systems, said method including the steps of:
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acquiring a phase image comprising a plurality of elements corresponding to pixels, dividing the phase image into a plurality of subimages each comprising a plurality of said elements wherein the sizes of the subimages are sufficiently small to limit the phase spread of each of the subimages to being no more than 2π
, andphase unwrapping in each subimage by adding a selected modulo 2π
constant to each element of the subimage to provide said continuous map of the magnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for providing a continous magnetic field map for magnetic resonance systems, said system including:
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means for acquiring a phase image comprising a plurality of elements corresponding to pixels, means for dividing the phase image into a plurality of subimages each comprising a plurality of said elements wherein the sizes of the subimages are sufficiently small to limit the phase spread of each of the subimages to being no more than 2π
, andmeans for phase unwrapping each subimage by adding a selected modulo 2π
constant to each element of the subimage to provide said continuous map of the magnetic field. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification