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    Few-view CT image reconstruction system
    1.
    发明授权
    Few-view CT image reconstruction system 有权

    公开(公告)号：US11806175B2

    公开(公告)日：2023-11-07

    申请号：US17642725

    申请日：2020-09-14

    申请人： Huidong Xie ,  Ge Wang ,  Hongming Shan ,  Wenxiang Cong

    发明人： Huidong Xie ,  Ge Wang ,  Hongming Shan ,  Wenxiang Cong

    IPC分类号： A61B6/03 ,  G06T11/00 ,  A61B6/00

    CPC分类号： A61B6/032 ,  A61B6/5205 ,  G06T11/005 ,  G06T11/006 ,  G06T2211/421 ,  G06T2211/436

    摘要： A system for few-view computed tomography (CT) image reconstruction is described. The system includes a preprocessing module, a first generator network, and a discriminator network. The preprocessing module is configured to apply a ramp filter to an input sinogram to yield a filtered sinogram. The first generator network is configured to receive the filtered sinogram, to learn a filtered back-projection operation and to provide a first reconstructed image as output. The first reconstructed image corresponds to the input sinogram. The discriminator network is configured to determine whether a received image corresponds to the first reconstructed image or a corresponding ground truth image. The generator network and the discriminator network correspond to a Wasserstein generative adversarial network (WGAN). The WGAN is optimized using an objective function based, at least in part, on a Wasserstein distance and based, at least in part, on a gradient penalty.

    PROVIDING A RESULT DATASET
    2.
    发明公开
    PROVIDING A RESULT DATASET 审中-公开

    公开(公告)号：US20230237716A1

    公开(公告)日：2023-07-27

    申请号：US18100948

    申请日：2023-01-24

    申请人： Siemens Healthcare GmbH

    发明人： Michael Manhart

    IPC分类号： G06T11/00

    CPC分类号： G06T11/008 ,  G06T11/005 ,  G06T2210/41 ,  G06T2211/436

    摘要： A computer-implemented method for providing a result dataset, comprising: acquisition of at least one projection mapping pair of an object under examination by a medical biplane imaging device, wherein the at least one projection mapping pair contains a first and a second projection mapping of the object under examination, that map the object under examination simultaneously in a first and a second detection plane, wherein the first and second detection plane are arranged non-parallel to one another, determination of a correction model for the correction of an artifact and/or a movement, wherein the artifact and/or the movement is mapped simultaneously in the at least one first and the at least one second projection mapping, wherein the at least one projection mapping pair specifies a consistency condition for the determination of the correction model, reconstruction of the result dataset at least from the at least one first projection mapping and on the basis of the correction model, provision of the result dataset.

    NOVEL ACQUISITION AND PROCESSING OF DATA IN A TOMOGRAPHIC IMAGING APPARATUS
    3.
    发明申请
    NOVEL ACQUISITION AND PROCESSING OF DATA IN A TOMOGRAPHIC IMAGING APPARATUS 审中-公开

    公开(公告)号：US20190187306A1

    公开(公告)日：2019-06-20

    申请号：US16284496

    申请日：2019-02-25

    申请人： FEI Company

    发明人： Andrew Kingston ,  Shane Latham ,  Adrian Sheppard ,  Glenn Myers ,  Benoit Recur ,  Heyang Li ,  Trond Karsten Varslot

    IPC分类号： G01T1/29 ,  G06T11/00 ,  H01J37/22 ,  G01N23/2204 ,  G01N23/046

    CPC分类号： G01T1/2985 ,  G01N23/046 ,  G01N23/2204 ,  G06T11/005 ,  G06T2211/436 ,  H01J37/222 ,  H01J2237/2807

    摘要： A method of investigating a specimen using a tomographic imaging apparatus comprising: A specimen holder, for holding the specimen; A source, for producing a beam of radiation that can be directed at the specimen; A detector, for detecting a flux of radiation transmitted through the specimen from the source; A stage apparatus, for producing relative motion of the source with respect to the specimen, so as to allow the source and detector to image the specimen along a series of different viewing axes; A processing apparatus, for assembling output from the detector into a tomographic image of at least part of the specimen, which method comprises the following steps: Considering a virtual reference surface that surrounds the specimen and is substantially centered thereon; Considering an incoming point of intersection of each of said viewing axes with this reference surface, thereby generating a set of such intersection points corresponding to said series of viewing axes; Choosing discrete viewing axes in said series so as to cause said set to comprise a two-dimensional lattice of points located areally on said reference surface in a substantially uniform distribution.

    RECONSTRUCTING DUAL-ENERGY CT IMAGES
    6.
    发明申请
    RECONSTRUCTING DUAL-ENERGY CT IMAGES 审中-公开

    公开(公告)号：US20180204357A1

    公开(公告)日：2018-07-19

    申请号：US15871131

    申请日：2018-01-15

    申请人： Shenyang Neusoft Medical Systems Co., Ltd.

    发明人： Shuangxue Li ,  Shanshan Lou ,  Lixia Tong

    IPC分类号： G06T11/00

    CPC分类号： G06T11/005 ,  G06T11/006 ,  G06T2207/10081 ,  G06T2211/408 ,  G06T2211/432 ,  G06T2211/436

    摘要： Methods and devices for reconstructing dual-energy CT images are provided. In one aspect, CT scan is performed with a high energy and a low energy periodical and alternatively changed on a scanning target, reconstruction data for a high-energy image of a current reconstruction position is obtained based on whether a circle of high-energy scan closest to the current reconstruction position of the scanning target is a full circle of scan, the high-energy image of the current reconstruction position is reconstructed according to the reconstruction data of the high-energy image; reconstruction data for a low-energy image of the current reconstruction position is obtained based on whether a circle of high-energy scan closest to the current reconstruction position of the scanning target is the full circle of scan, the low-energy image of the current reconstruction position is reconstructed according to the reconstruction data of the low-energy image.

    FEW-VIEW IMAGE RECONSTRUCTION
    7.
    发明申请
    FEW-VIEW IMAGE RECONSTRUCTION 审中-公开

    公开(公告)号：US20180182128A1

    公开(公告)日：2018-06-28

    申请号：US15392985

    申请日：2016-12-28

    申请人： Lawrence Livermore National Security, LLC

    发明人： Kyle Champley

    IPC分类号： G06T11/00

    CPC分类号： G06T11/003 ,  G06T11/006 ,  G06T17/10 ,  G06T2210/41 ,  G06T2211/436

    摘要： A CT image reconstruction system is provided that provides a solution to a few-view problem by generating a 3D image from measurements and a forward projection matrix for a CT scan of an object that tends to minimize streaks and other artifacts. The system initially receives measurements and a forward projection matrix for the CT scan. The system during an initial stage generates an initial 3D image based on various constraints so that (1) the reconstruction of the initial 3D image can be perform quickly and (2) the difference between the measurements and the forward projection of the initial 3D image has significantly lower contrast and high frequency content as compared the measurements themselves. The system then during a final stage applies an iterative algorithm to reconstruct the 3D image with the 3D image initialized to the initial 3D image at the beginning of the iterative algorithm.