Methods and systems for correcting table deflection
AssigneesGeneral Electric Company, University of Notre Dame du Lac
InventorsGuangzhi Cao, Jiang Hsieh, Jean-Baptiste Thibault, Jiahua Fan, Ken D. Sauer
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Abstract
Various methods and systems are provided for estimating and compensating for table deflection in reconstructed images. In one embodiment, a method for computed tomography (CT) imaging comprises reconstructing images from data acquired during a helical CT scan where table deflection parameters are estimated and the reconstruction is adjusted based on the table deflection parameters. In this way, images may be reconstructed without artifacts caused by table deflection.
Claims12
A method for computed tomography (CT) imaging, comprising:
- acquiring projection data during a helical CT scan of a subject;
- reconstructing at least two images by applying an image reconstruction algorithm to the projection data;
- estimating table deflection parameters based on the at least two image reconstructions;
- and
- reconstructing an image by applying the image reconstruction algorithm to the projection data, wherein the image reconstruction algorithm is modified based on the table deflection parameters to compensate for table deflection.
An imaging system, comprising:
- a table;
- a source configured to generate energy;
- a detector configured to detect the energy;
- and
- a processor configured to:
- acquire CT projection data from the detector during a scan of an object placed on the table;
- estimate a deflection of the table directly from the acquired CT projection data;
- and
- reconstruct CT images from the acquired CT projection data where the reconstruction is adjusted based on the estimated deflection.
Dependencies are inferred from the claim text.