Method and device for reconstructing a 3D image data set of a moving object
First Claim
1. A method for reconstructing a 3D image data set of a moving object from a set of projection images which are recorded at least partially one after the other from different projection directions, comprising:
- dividing the set of projection images into a plurality of subsets based on a specific motion phase of the moving object;
reconstructing an incomplete 3D image of the moving object from each projection image of the subsets using a local tomography method, wherein the incomplete 3D image obtained using local tomography contains a segment of an intensity edge in the moving object and the segment is essentially parallel to a projection direction of a projection image belonging to an associated subset;
determining a motion field of the moving object from the incomplete 3D image, the motion field showing a motion of the moving object between two successive motion phases;
generating the 3D image data of the moving object with a motion correction effected by the motion field; and
displaying a 3D image of the moving object based on the generated 3D image data.
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Accused Products
Abstract
The invention relates to a method and device for reconstructing a 3D image data set of a moving object from a set of projection images, which were recorded at least partially one after the other from different projection directions. The projection images are hereby assigned by ECG gating to a motion phase of the object in each instance and an incomplete 3D image of the object is computed in this motion phase from these few projection images using local tomography. Motion fields are determined from these 3D images and are used during the final 3D image reconstruction for motion correction.
14 Citations
11 Claims
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1. A method for reconstructing a 3D image data set of a moving object from a set of projection images which are recorded at least partially one after the other from different projection directions, comprising:
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dividing the set of projection images into a plurality of subsets based on a specific motion phase of the moving object; reconstructing an incomplete 3D image of the moving object from each projection image of the subsets using a local tomography method, wherein the incomplete 3D image obtained using local tomography contains a segment of an intensity edge in the moving object and the segment is essentially parallel to a projection direction of a projection image belonging to an associated subset; determining a motion field of the moving object from the incomplete 3D image, the motion field showing a motion of the moving object between two successive motion phases; generating the 3D image data of the moving object with a motion correction effected by the motion field; and displaying a 3D image of the moving object based on the generated 3D image data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for reconstructing a 3D image data set of a moving object from a set of projection images which are recorded at least partially one after the other from different projection directions, comprising:
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a dividing device for dividing the set of projection images into a plurality of subsets based on a specific motion phase of the moving object; a first computing module for reconstructing an incomplete 3D image of the moving object from each projection image of the subsets using a local tomography method, wherein the incomplete 3D image obtained using local tomography contains a segment of an intensity edge in the moving object and the segment is essentially parallel to a projection direction of a projection image belonging to an associated subset; a second computing module for determining a motion field of the moving object from the incomplete 3D image, the motion field showing a motion of the moving object between two successive motion phases; and a third computing module for generating the 3D image data of the moving object with a motion correction effected by the motion field. - View Dependent Claims (8, 9, 10, 11)
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Specification