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    Volume image reconstruction using projection decomposition
    2.
    发明授权
    Volume image reconstruction using projection decomposition 有权

    公开(公告)号：US10089758B1

    公开(公告)日：2018-10-02

    申请号：US15472613

    申请日：2017-03-29

    Applicant: Carestream Health, Inc.

    Inventor： Lawrence A. Ray ,  Richard A. Simon ,  Levon O. Vogelsang

    IPC: G06T11/00 ,  G06T5/00

    Abstract: A method for forming an image reconstructs a volume image according to X-ray projection images acquired at acquisition angles. The full volume image is partitioned to form at least a first and a second non-overlapping sub-volume. Within each sub-volume, forward projection images for the sub-volume are calculated, with the corresponding forward projection images computed at the acquisition angles, and with intermediate forward projection images at angles between the acquisition angles. A weight factor relates the contribution of each pixel in the X-ray projection images to each sub-volume at each acquisition angle. Synthesized sub-volume projection images are formed according to the calculated weight factors and acquired projection images in each sub-volume. Synthesized sub-volume projection images form synthesized projection images for the full volume image. A second volume image is reconstructed according to the acquired X-ray projection images and the synthesized projection images. The reconstructed second volume image is displayed, stored, or transmitted.

    Accelerated statistical iterative reconstruction
    3.
    发明授权
    Accelerated statistical iterative reconstruction 有权

    公开(公告)号：US10049446B2

    公开(公告)日：2018-08-14

    申请号：US14973964

    申请日：2015-12-18

    Applicant: Carestream Health, Inc.

    Inventor： Richard A. Simon

    IPC: G06T7/00 ,  G06T11/00 ,  G06T5/00 ,  G06T19/00

    Abstract: A method for reconstructing a volume image of a subject, executed at least in part by a computer, accesses projection x-ray images of the subject and performs a volume image reconstruction using the x-ray images by iteratively performing alternating steps of a tomographic update, where a gradient based algorithm having a preconditioner is used to update the volume image reconstruction and a spatially varying denoising that is a function of the preconditioner. The method displays, stores, or transmits the volume image reconstruction.

    Virtual projection image method
    4.
    发明授权
    Virtual projection image method 有权

    公开(公告)号：US09965875B2

    公开(公告)日：2018-05-08

    申请号：US15187834

    申请日：2016-06-21

    Applicant: Carestream Health, Inc.

    Inventor： Lawrence A. Ray ,  Richard A. Simon ,  Levon O. Vogelsang

    IPC: G06K9/00 ,  G06T11/00 ,  G06T5/00

    CPC classification number: G06T11/008 ,  G06T5/002 ,  G06T2207/10081

    Abstract: A method of generating a synthesized digital projection image, executed at least in part by a computer, acquires x-ray projection images at corresponding acquisition angles, and reconstructs a first volume image. Forward projection generates a preceding forward projection image at a first acquisition angle; a following forward projection image at an adjacent second acquisition angle; and an intermediate forward projection image for an intermediate angle. A synthesized projection image is formed by identifying a candidate patch of pixels from the intermediate forward projection image, matching a first patch of pixels from the preceding forward projection image and identifying a corresponding first acquired patch of pixels from the first acquired x-ray projection image, matching a second patch of pixels from the following forward projection image and matching a second acquired patch of pixels from the forward projection image. The first and second acquired patches are combined.

    Mobile radiography calibration for tomosynthesis using epipolar data consistency
    6.
    发明授权
    Mobile radiography calibration for tomosynthesis using epipolar data consistency 有权

    公开(公告)号：US10722207B2

    公开(公告)日：2020-07-28

    申请号：US16372477

    申请日：2019-04-02

    Applicant: CARESTREAM HEALTH, INC.

    Inventor： Levon O. Vogelsang ,  Richard A. Simon ,  Lawrence A. Ray

    IPC: G01T1/166 ,  A61B6/00 ,  G06T7/00 ,  A61B6/02 ,  G06T11/00 ,  G16H30/40

    Abstract: A method for geometric calibration of a radiography apparatus acquires tomosynthesis projection images of patient anatomy from a detector and an x-ray source translated along a scan path. An epipolar geometry is calculated according to the relative position of the detector to the scan path by estimating a direction for epipolar lines that extend along an image plane that includes the detector. A region of interest of the patient anatomy that is a portion of each projection image and is fully included within each projection image in the series is defined. A consistency metric is calculated for estimated epipolar lines extending within the ROI. The method iteratively adjusts the epipolar line estimation until the consistency metric indicates accuracy to within a predetermined threshold. A portion of a tomosynthesis volume is reconstructed and displayed.

    Iterative volume image reconstruction using synthetic projection images
    7.
    发明授权
    Iterative volume image reconstruction using synthetic projection images 有权

    公开(公告)号：US10307114B1

    公开(公告)日：2019-06-04

    申请号：US15974812

    申请日：2018-05-09

    Applicant: CARESTREAM HEALTH, INC.

    Inventor： Lawrence A. Ray ,  Richard A. Simon ,  Levon O. Vogelsang

    IPC: G06K9/00 ,  A61B6/03 ,  G06T11/00 ,  A61B6/00

    Abstract: A method for imaging a subject obtains a first set of acquired projection images of a subject volume, wherein each projection image in the first set has a corresponding acquisition angle and forms an initial reconstructed volume image. A second set of synthetic projection images is generated according to processing of the acquired projection images and combined with the first set to form a combined set of projection images. The method augments the initial reconstructed image to form an improved reconstructed image by at least a first iteration of an iterative reconstruction process using the initial reconstructed image with the combined set of acquired and synthetic projection images and at least a subsequent iteration of the iterative reconstruction process using the first set of acquired projection images and fewer than, or none of, the second set of synthetic projection images. The improved reconstruction image is rendered on a display.

    VOLUME IMAGE RECONSTRUCTION USING PROJECTION DECOMPOSITION
    8.
    发明申请
    VOLUME IMAGE RECONSTRUCTION USING PROJECTION DECOMPOSITION 审中-公开

    公开(公告)号：US20180286087A1

    公开(公告)日：2018-10-04

    申请号：US15472613

    申请日：2017-03-29

    Applicant: Carestream Health, Inc.

    Inventor： Lawrence A. Ray ,  Richard A. Simon ,  Levon O. Vogelsang

    IPC: G06T11/00 ,  G06T5/00

    Abstract: A method for forming an image reconstructs a volume image according to X-ray projection images acquired at acquisition angles. The full volume image is partitioned to form at least a first and a second non-overlapping sub-volume. Within each sub-volume, forward projection images for the sub-volume are calculated, with the corresponding forward projection images computed at the acquisition angles, and with intermediate forward projection images at angles between the acquisition angles. A weight factor relates the contribution of each pixel in the X-ray projection images to each sub-volume at each acquisition angle. Synthesized sub-volume projection images are formed according to the calculated weight factors and acquired projection images in each sub-volume. Synthesized sub-volume projection images form synthesized projection images for the full volume image. A second volume image is reconstructed according to the acquired X-ray projection images and the synthesized projection images. The reconstructed second volume image is displayed, stored, or transmitted.

    ITERATIVE RECONSTRUCTION PROCESS
    9.
    发明申请
    ITERATIVE RECONSTRUCTION PROCESS 有权

    公开(公告)号：US20170100088A1

    公开(公告)日：2017-04-13

    申请号：US14879136

    申请日：2015-10-09

    Applicant: Carestream Health, Inc.

    Inventor： Richard A. Simon

    IPC: A61B6/00 ,  A61B6/03

    CPC classification number: A61B6/5258 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/4085 ,  A61B6/5205 ,  G06T11/003

    Abstract: An iterative algorithmic method determines spatial distribution of attenuation values of an object based on measured projection data of the object. An algorithm generates estimated projection data based on an estimated spatial distribution of the attenuation values. Correction data is determined based on a difference between the measured projection data and the estimated projection data. Spatially extended correction data is back projected to update the estimated spatial distribution of the attenuation values. The algorithmic iterations continue until a stopping criterion is reached.

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