DEVICE AND METHOD FOR DELINEATING A METAL OBJECT FOR ARTIFACT REDUCTION IN TOMOGRAPHY IMAGES
First Claim
1. A method for delineating a metal object for artifact reduction in tomography images, the method comprising:
- receiving, from a projection device, a plurality of projection images of a body containing the metal object;
generating a volume model of at least part of the body using the plurality of projection images;
selecting a plurality of voxels of the volume model, the plurality of voxels selected to be part of a region encompassing the metal object and at least one metal artifact based on a segmentation criterion, each of the plurality of voxels having a voxel value;
combining the plurality of voxels and the at least one metal artifact into a first volume mask;
projecting the first volume mask onto each of the plurality of projection images, the projecting resulting in a respective projection mask for each of the projection images;
altering each respective projection mask based on a plurality of pixel values of the respective projection images;
determining a second volume mask from the altered projection masks;
altering the second volume mask based on the plurality of voxel values of the volume model; and
providing the altered second volume mask as a three-dimensional form of the metal object.
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Accused Products
Abstract
A method for delineating a metal object for artifact reduction in tomography images is provided. Projection images of a body containing the metal object are received and a volume model of the body is formed on the basis of the projection images. Voxels that are part of a region encompassing the metal object and at least one metal artifact are chosen in the volume model on the basis of segmentation criterion and combined to form a first volume mask. The first volume mask is projected onto the projection images and a respective projection mask is generated. The projection masks are is altered on the basis of pixel values of the projection images. A second volume mask is determined from the altered projection masks. The second volume mask is altered on the basis of voxel values of the volume model and the altered volume mask is supplied as a description of the metal object.
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Citations
20 Claims
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1. A method for delineating a metal object for artifact reduction in tomography images, the method comprising:
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receiving, from a projection device, a plurality of projection images of a body containing the metal object; generating a volume model of at least part of the body using the plurality of projection images; selecting a plurality of voxels of the volume model, the plurality of voxels selected to be part of a region encompassing the metal object and at least one metal artifact based on a segmentation criterion, each of the plurality of voxels having a voxel value; combining the plurality of voxels and the at least one metal artifact into a first volume mask; projecting the first volume mask onto each of the plurality of projection images, the projecting resulting in a respective projection mask for each of the projection images; altering each respective projection mask based on a plurality of pixel values of the respective projection images; determining a second volume mask from the altered projection masks; altering the second volume mask based on the plurality of voxel values of the volume model; and providing the altered second volume mask as a three-dimensional form of the metal object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for delineating a metal object in a volume model formed from a plurality of projection images of a body containing the metal object, the apparatus comprising:
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a receiver configured to receive the plurality of projection images; and a processor configured to generate a volume model of at least part of the body using the plurality of projection images, select a plurality of voxels that are part of a region encompassing the metal object and at least one metal artifact based on a segmentation criterion, each of the plurality of voxels having a voxel value, the processor further configured to combine the selected plurality of voxels and the at least one metal artifact to form a first volume mask, project the first volume mask onto each of the plurality of projection images to generate respective projection masks, alter each respective projection mask based on a plurality of pixel values of the respective projection images, determine a second volume mask from the altered projection masks, alter the second volume mask based on the plurality of voxel values of the volume model, and provide the altered second volume mask as a three-dimensional form of the metal object. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification