Method and apparatus for filtering projection data of a helical scan
AssigneeGE Medical Systems Global Technology Company, LLC
InventorJiang Hsieh
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Abstract
A method for filtering projection data of a helical scan of an object includes acquiring projection data representing a helical scan of an object, generating a weighting function based on the acquired projection data, determining a scaling function for the weighting function, and determining a row-filtered weighting function based on the weighting function and scaling function.
Claims21
A method for filtering projection data of a tomographic scan of an object, comprising:
- acquiring projection data representing a tomographic scan of an object;
- generating a weighting function based on the acquired projection data;
- determining a scaling function for the weighting function;
- and
- determining a row-filtered weighting function based on the weighting function and scaling function.
A system for producing a scanned image of an object, said system comprising a computer programmed to:
- acquire projection data representative of a tomographic scan of an object;
- generate a weighting function based on the acquired projection data;
- determine a scaling function for the weighting function;
- and
- determine a row-filtered weighting function based on the weighting function and scaling function.
The system of claim 15, wherein said system further comprises a computer programmed to:
- determine a row-filtered weighting function according to the equation w ′ ( γ , β , n ) = ∑ k = - K K [ ϕ ( k ) w ( γ , β , n + k ) ]
- 17.The system of claim 16, wherein said system further comprises a computer programmed to:
- produce a final weighted projection dataset by applying the row-filtered weighting function to the projection data;
- and
- reconstruct an image by filtering and backprojecting the weighted projection dataset.
The system of claim 17, wherein said system further comprises a computer programmed to:
- reconstruct an image having a FWHM comparable to a reconstructed image from a z-filtering reconstruction method.
Dependencies are inferred from the claim text.