Fourier and spline-based reconstruction of helical CT images
AssigneeArch Development Corporation
InventorsXiaochuan Pan, Patrick Jean La Riviere
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Abstract
A method and apparatus are provided for reconstructing a set of CT images from helical CT data. The method includes the steps of receiving the helical CT data and generating a set of fan-beam sinograms at equally spaced longitudinal positions. The method further includes the steps of estimating a set of parallel-beam sinograms from the generated set of fan-beam sinograms and reconstructing the CT images using a parallel beam reconstruction algorithm.
Claims42
A method of reconstructing a set of CT images from helical CT data, such method comprising the steps of:
- receiving the helical CT data;
- generating a set of fan-beam sinograms at equally spaced longitudinal positions;
- and
- estimating a set of parallel-beam sinograms from the generated set of fan-beam sinograms;
- and
- reconstructing the CT images using a parallel beam reconstruction algorithm.
Apparatus for reconstructing a set of CT images from helical CT data, such apparatus comprising:
- means for receiving the helical CT data;
- means for generating a set of fan-beam sinograms at equally spaced longitudinal positions;
- and
- means for estimating a set of parallel-beam sinograms from the generated set of fan-beam sinograms;
- and
- means for reconstructing the CT images using a parallel beam reconstruction algorithm.
Apparatus for reconstructing a set of CT images from helical CT data, such apparatus comprising:
- a memory adapted to receive the helical CT data;
- a sinogram processor adapted to generate a set of fan-beam sinograms at equally spaced longitudinal positions;
- and
- an estimator processor adapted to estimate a set of parallel-beam sinograms from the generated set of fan-beam sinograms;
- and
- a reconstruction processor adapted to reconstruct the CT images using a parallel beam reconstruction algorithm.
Dependencies are inferred from the claim text.