Methods and apparatus for motion gating using CT projection data
AssigneeGE Medical Systems Global Technology Company, LLC
InventorJiang Hsieh
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Abstract
Methods and apparatus for reducing motion-induced artifacts in CT imaging is described. The imaging system scans a patient's heart to obtain a plurality of projection views, a differential projection is determined from the projection views, a weighting function is applied to the differential projection to minimize motion artifacts, and an inconsistency index is determined from the differential projection, and the inconsistency index is used to locate an image reconstruction location. This method directly measures the mechanics of the heart, rather than an electrical signal and utilizes projection data to select the best locations to minimize image artifact.
Claims37
A method for determining a reconstruction location when imaging a heart with a computed tomographic imaging system, said method comprising the steps of:
- scanning a patient to acquire projection data for a plurality of projection views;
- determining a differential projection from the projection data;
- applying a weighting function to the differential projection;
- and
- determining an inconsistency index to identify a reconstruction location.
An imaging system comprising a computer, a gantry having a detector array, an x-ray source for radiating an x-ray beam along an imaging plane toward a detector array including a plurality of detector cells, the computer coupled to the x-ray source and the gantry, said imaging system configured to:
- acquire projection data for a plurality of projection views;
- determine a differential projection based on a first and last projection view;
- apply a weighting function to said differential projection;
- and
- determine an inconsistency index to identify a reconstruction location.
A processor programmed to determine a reconstruction location in an imaging system, said processor configured to:
- acquire projection data for a plurality of projection views;
- determine a differential projection based on a first and last projection view;
- apply a weighting function to said differential projection;
- determine an inconsistency index;
- determine at least one inconsistency index slope to determine at least a systolic phase and diastole phase;
- and
- identify a reconstruction location based on a location of the end of the diastole phase.
A computer-readable medium in an imaging system, said computer-readable medium comprising:
- records of projection data for a plurality of projection views;
- records of differential projections based on said records of projection data;
- a plurality of rules to apply a weighting function to said records of differential projection;
- a plurality of rules to determine records of inconsistency index for each projection view;
- and
- a plurality of rules to identify a reconstruction location based on said records of inconsistency index.
An computer tomographic imaging system comprising a computer, a gantry having a detector array, an x-ray source for radiating an x-ray beam along an imaging plane toward a detector array including a plurality of detector cells, the computer coupled to the x-ray source and the gantry, said imaging system configured to:
- acquire projection data for a plurality of projection views;
- determine a differential projection based on a first and last projection view;
- apply a weighting function to said differential projection;
- generate at least one inconsistency index slope based on an inconsistency index to determine at least a systolic phase and a diastole phase;
- and
- determine a reconstruction location that is located at the end of the diastole phase.
Dependencies are inferred from the claim text.