Geometry based field prediction method for susceptibility mapping and phase artifact removal
First Claim
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1. A method comprising:
- obtaining magnetic resonance phase data of an object;
assigning a phase value to each of a plurality of voxels, the phase values being dependent upon the phase data;
dividing the plurality of voxels into at least first and second regions;
assigning an initial susceptibility value to each of the voxels of the first region, the initial susceptibility values of the voxels of the first region being identical to each other;
assigning an initial susceptibility value to each of the voxels of the second region, the initial susceptibility values of the voxels of the second region being identical to each other;
determining which of the plurality of voxels meet a criteria, the criteria being dependent upon a signal-to-noise ratio of the phase values;
assigning a revised susceptibility value to each of the voxels of the first region, the revised susceptibility values of the voxels of the first region being identical to each other and being dependent upon the phase data associated with only the voxels that meet the criteria;
assigning a revised susceptibility value to each of the voxels of the second region, the revised susceptibility values of the voxels of the second region being identical to each other, different from the susceptibility values of the voxels of the first region, and dependent upon the phase data associated with only the voxels that meet the criteria; and
generating an image that is dependent upon the revised susceptibility values.
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Abstract
The present invention provides a method of handling rapid phase aliasing in magnetic resonance images arising from local magnetic susceptibility differences. The methods of the present invention can be used to estimate the field effects within an object arising from the interfaces of regions having differences in magnetic susceptibilities, and to subtract out the resulting phase from the original or source phase data prior to any further phase processing. The methods of the present invention also include a process of accurately determining the susceptibility values of multiple voxel regions based on the geometry of such regions.
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Citations
19 Claims
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1. A method comprising:
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obtaining magnetic resonance phase data of an object; assigning a phase value to each of a plurality of voxels, the phase values being dependent upon the phase data; dividing the plurality of voxels into at least first and second regions; assigning an initial susceptibility value to each of the voxels of the first region, the initial susceptibility values of the voxels of the first region being identical to each other; assigning an initial susceptibility value to each of the voxels of the second region, the initial susceptibility values of the voxels of the second region being identical to each other; determining which of the plurality of voxels meet a criteria, the criteria being dependent upon a signal-to-noise ratio of the phase values; assigning a revised susceptibility value to each of the voxels of the first region, the revised susceptibility values of the voxels of the first region being identical to each other and being dependent upon the phase data associated with only the voxels that meet the criteria; assigning a revised susceptibility value to each of the voxels of the second region, the revised susceptibility values of the voxels of the second region being identical to each other, different from the susceptibility values of the voxels of the first region, and dependent upon the phase data associated with only the voxels that meet the criteria; and generating an image that is dependent upon the revised susceptibility values. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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obtaining magnetic resonance phase data of an object; assigning a first phase value to each of a plurality of voxels, the first phase values being dependent upon the phase data; dividing the plurality of voxels into at least first and second regions; assigning each of the voxels in the first region a susceptibility value; estimating an induced phase value for each of the voxels of the second region, the induced phase values being dependent upon the susceptibility values of the voxels of the first region; generating revised phase values for each of the voxels of the second region, the revised phase values being dependent upon the first phase values and the induced phase values; and generating an image that is dependent upon the revised phase values. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification