Reducing Artifacts in an Image Data Set and X-Ray Device
First Claim
1. A method for reducing artifacts generated by at least one X-ray attenuating object arranged outside a reconstruction volume in a three-dimensional image data set showing the reconstruction volume, which is reconstructed from two-dimensional projection images recorded from different projection directions, the method comprising:
- localizing the object in the projection images showing the object; and
determining corrected projection images for the reconstruction of the image data set, the image data of the area of each projection image showing the object being corrected to remove the object, wherein the localizing of the object is performed taking into account difference images of the measured projection images and from a reconstruction data set of forward-projected comparative images reconstructed from the measured projection images.
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Abstract
Streak artifacts generated by at least one X-ray attenuating object arranged outside a reconstruction volume in a three-dimensional image data set showing the reconstruction volume are reduced. The reconstruction volume is reconstructed from two-dimensional projection images recorded from different projection directions. The object is localized in the projection images showing the object. To determine corrected projection images for the reconstruction of the image data set, the image data of the area of each projection image showing the object is corrected to remove the object. The localization of the object is performed taking into account difference images of the measured projection images and from a reconstruction data set of forward-projected comparative images reconstructed from the measured projection images.
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Citations
19 Claims
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1. A method for reducing artifacts generated by at least one X-ray attenuating object arranged outside a reconstruction volume in a three-dimensional image data set showing the reconstruction volume, which is reconstructed from two-dimensional projection images recorded from different projection directions, the method comprising:
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localizing the object in the projection images showing the object; and determining corrected projection images for the reconstruction of the image data set, the image data of the area of each projection image showing the object being corrected to remove the object, wherein the localizing of the object is performed taking into account difference images of the measured projection images and from a reconstruction data set of forward-projected comparative images reconstructed from the measured projection images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An X-ray device comprising:
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an X-ray source; an X-ray detector; and a control device configured to; localize an object in a projection images showing the object; determine corrected projection images for the reconstruction of an image data set, the image data of an area of each projection image showing the object being corrected to remove the object, wherein the localizing of the object is performed taking into account difference images of the projection images and from a reconstruction data set of forward-projected comparative images reconstructed from the projection images. - View Dependent Claims (19)
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18. The X-ray device of claim 17, wherein the control device is configured to:
segment the area showing the object in the difference images using an edge detection algorithm.
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18-1. A non-transitory computer readable storage medium having stored thereon instructions, the instructions when executed by a computing device:
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localizing an object in projection images showing the object; and determining corrected projection images for the reconstruction of an image data set, image data of the area of each projection image showing the object being corrected to remove the object, wherein the localizing of the object is performed taking into account difference images of the measured projection images and from a reconstruction data set of forward-projected comparative images reconstructed from the measured projection images.
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Specification