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公开(公告)号：US20210174561A1
公开(公告)日：2021-06-10
申请号：US17110743
申请日：2020-12-03
摘要： Techniques for computed tomography (CT) image reconstruction are presented. The techniques can include acquiring, by a detector grid of a computed tomography system, detector signals for a location within an object of interest representing a voxel, where each detector signal of a plurality of the detector signals is obtained from an x-ray passing through the location at a different viewing angle; reconstructing a three-dimensional representation of at least the object of interest, the three-dimensional representation comprising the voxel, where the reconstructing comprises computationally perturbing a location of each detector signal of the plurality of detector signals within the detector grid, where the computationally perturbing corresponds to randomly perturbing a location of the x-ray within the voxel; and outputting the three-dimensional representation.
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公开(公告)号：US12045916B2
公开(公告)日：2024-07-23
申请号：US17110743
申请日：2020-12-03
CPC分类号： G06T11/008 , A61B6/032 , A61B6/4233 , A61B6/466 , G06T11/003 , G06T11/006 , G06T15/08 , G06T2207/10081 , G06T2210/41 , G06T2211/421 , G06T2211/424 , G06T2211/432
摘要： Techniques for computed tomography (CT) image reconstruction are presented. The techniques can include acquiring, by a detector grid of a computed tomography system, detector signals for a location within an object of interest representing a voxel, where each detector signal of a plurality of the detector signals is obtained from an x-ray passing through the location at a different viewing angle; reconstructing a three-dimensional representation of at least the object of interest, the three-dimensional representation comprising the voxel, where the reconstructing comprises computationally perturbing a location of each detector signal of the plurality of detector signals within the detector grid, where the computationally perturbing corresponds to randomly perturbing a location of the x-ray within the voxel; and outputting the three-dimensional representation.
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公开(公告)号：US12039738B2
公开(公告)日：2024-07-16
申请号：US17056639
申请日：2019-05-17
CPC分类号： G06T7/20 , A61B6/032 , A61B6/4021 , A61B6/4085 , A61B6/501 , A61B6/5205 , A61B6/5264 , G06T2207/10081 , G06T2207/20201
摘要： The present invention is directed to a method of multi-motion compensation for high-quality cone-beam CT of the head. A multi-stage approach is incorporated that includes a pre-conditioning stage in which an initial estimation of the motion trajectory is obtained with 3D-2D registration using the motion-contaminated CBCT and projection data. In the present invention, the motion-contaminated CBCT is used as a basis for 3D-2D registration in the pre-conditioning stage to capture large amplitude, rapid movements of the head and provide better initialization of the autofocus solution.
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