Robust artifact reduction in image reconstruction
AssigneeGeneral Electric Company
InventorsBernhard Erich Hermann Claus, David Allen Langan, Taylor Robert Braun-Jones
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Abstract
Approaches are disclosed for removing or reducing metal artifacts in reconstructed images. The approaches include creating a metal mask in the projection domain, interpolating data within the metal mask, and perform a reconstruction using the interpolated data. In certain embodiments the metal structure is separately reconstructed and combined with the reconstructed volume.
Claims19
A computer-implemented method for processing projection image data, comprising:
- generating a set of tentative two-dimensional (2D) metal masks, wherein each tentative 2D metal mask is generated based on a comparison between a respective projection image and a corresponding background image;
- backprojecting each tentative 2D metal mask to generate a respective set of backprojected three-dimensional (3D) data in image space for each tentative 2D metal mask;
- combining the sets of backprojected three-dimensional (3D) data in image space to generate a 3D metal mask;
- and
- reprojecting the 3D metal mask to generate one or more metal masks in projection space.
A computer-implemented method for processing projection image data, comprising:
- accessing a mathematically incomplete set of acquired projection images;
- reconstructing an initial volume from the mathematically incomplete set of acquired projection images;
- generating a three-dimensional (3D) metal mask from the initial volume;
- refining the 3D metal mask;
- and
- reprojecting the 3D metal mask to generate one or more metal masks in projection space.
An image processing system, comprising:
- a memory storing one or more routines;
- and
- a processing component configured to execute the one or more routines stored in the memory, wherein the one or more routines, when executed by the processing component, cause acts to be performed comprising:
- accessing or acquiring projection image data;
- generating a set of tentative two-dimensional (2D) metal masks, wherein each tentative 2D metal mask is generated based on a comparison between a respective projection image and a corresponding background image;
- backprojecting each tentative 2D metal mask to generate a respective set of backprojected three-dimensional (3D) data in image space for each tentative 2D metal mask;
- combining the sets of backprojected three-dimensional (3D) data in image space to generate a 3D metal mask;
- and
- reprojecting the 3D metal mask to generate one or more metal masks in projection space.
Dependencies are inferred from the claim text.