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    METHODS FOR CALIBRATING A SPECTRAL X-RAY IMAGING SYSTEM TO PERFORM MATERIAL DECOMPOSITION
    3.
    发明申请
    METHODS FOR CALIBRATING A SPECTRAL X-RAY IMAGING SYSTEM TO PERFORM MATERIAL DECOMPOSITION 有权

    公开(公告)号：US20220061794A1

    公开(公告)日：2022-03-03

    申请号：US17419088

    申请日：2019-12-27

    Applicant: CARESTREAM DENTAL LLC

    Inventor： Jay S. SCHILDKRAUT ,  Jean-Marc INGLESE ,  Krishnamoorthy SUBRAMANYAN ,  Vincent LOUSTAUNEAU

    IPC: A61B6/00 ,  G01T1/169 ,  G01T1/36

    Abstract: The present disclosure describes methods for calibrating a spectral X-ray system to perform material decomposition with a single scan of an energy discriminating detector or with a single scan at each used X-ray spectrum. The methods may include material pathlengths exceeding the size of the volume reconstructable by the system. Example embodiments include physical and matching calibration phantoms. The physical calibration phantom is used to measure the attenuation of X-rays passing therethrough with all combinations of pathlengths through the calibration's basis materials. The matching digital calibration phantom is registered with the physical calibration phantom and is used to calculate the pathlength though each material for each measured attenuation value. A created data structure includes the X-ray attenuation for each X-ray spectrum or detector energy bin for all combinations of basis material pathlengths. The data structure is usable to perform a material decomposition on the X-ray projection of an imaged object.

    INTRAORAL 3D SCANNING WITH AUTOMATIC CHARTING
    4.
    发明申请
    INTRAORAL 3D SCANNING WITH AUTOMATIC CHARTING 有权

    公开(公告)号：US20230000600A1

    公开(公告)日：2023-01-05

    申请号：US17781060

    申请日：2020-12-03

    Applicant: CARESTREAM DENTAL LLC

    Inventor： Victor C. WONG ,  Jean-Marc INGLESE ,  Edward R. SHELLARD

    IPC: A61C9/00

    Abstract: A method for intraoral imaging generates one or more output imaging signals from an intraoral probe and acquires multimodal image content from intraoral surface locations according to tissue response from the one or more imaging signals and associates spatial coordinates to the acquired multimodal image content. A surface contour of the patient dentition is generated by stitching the acquired multimodal image content and preserving the association of spatial coordinates with the stitched multimodal image content. Tooth outlines for one or more teeth are generated from the generated surface contour and the generated outlines arranged as a dental chart representing a spatial ordering of the one or more teeth and of supporting gum tissue adjacent to the teeth. The dental chart is populated by analyzing the acquired multimodal image content and associating the analysis to positions on the dental chart according to the preserved association of spatial coordinates and is displayed.

    GEOMETRIC CALIBRATION MARKER DETECTION IN SPECTRAL TOMOSYNTHESIS SYSTEM
    5.
    发明申请
    GEOMETRIC CALIBRATION MARKER DETECTION IN SPECTRAL TOMOSYNTHESIS SYSTEM 有权

    公开(公告)号：US20220330911A1

    公开(公告)日：2022-10-20

    申请号：US17635937

    申请日：2020-08-19

    Applicant: CARESTREAM DENTAL LLC

    Inventor： Jay S. SCHILDKRAUT ,  Jean-Marc INGLESE ,  Subramanyan KRISHNAMOORTHY

    IPC: A61B6/00 ,  A61B6/02 ,  A61B6/14

    Abstract: A method for geometric calibration of a volume imaging apparatus disposes calibration phantom in a radiation path that includes a subject positioned between an x-ray source and a detector. The phantom has a number of radio-opaque markers formed of a marker material. In a repeated sequence, at each of a number of positional relationships of the x-ray source to the detector: 2D projection image data is acquired for the subject and the phantom, wherein the 2D projection image data distinguishes at least first and second x-ray energy distributions; source-to-detector geometry of the imaging apparatus is calculated, corresponding to the acquired 2D projection image data for the first and second x-ray energy distributions. The method reconstructs and displays a 3D volume image of the subject according to acquired anatomy image data from the subject and source-to-detector geometry within the 2D projection images.

    MOVABLE AND STATIC COLLIMATORS AND X-RAY SOURCE ARRANGEMENTS FOR INTRAORAL TOMOSYNTHESIS
    6.
    发明申请
    MOVABLE AND STATIC COLLIMATORS AND X-RAY SOURCE ARRANGEMENTS FOR INTRAORAL TOMOSYNTHESIS 有权

    公开(公告)号：US20220151576A1

    公开(公告)日：2022-05-19

    申请号：US17431743

    申请日：2020-03-11

    Applicant: CARESTREAM DENTAL LLC

    Inventor： Krishnamoorthy SUBRAMANYAN ,  Vincent LOUSTAUNEAU ,  Jay S. SCHILDKRAUT ,  Jean-Marc INGLESE

    IPC: A61B6/00 ,  A61B6/02 ,  A61B6/14 ,  A61B6/06 ,  A61B90/00

    Abstract: An intraoral tomosynthesis imaging apparatus having an intraoral detector coupled to a frame or radio-opaque marker attached to its radiation facing surface without any frame attached, wherein the frame defines a target aperture for an incident radiation beam. An enclosure seats against the target aperture and houses at least one x-ray source configured to emit a radiation beam from each of a plurality of focal points within the enclosure A collimator is disposed to form a collimated radiation beam and direct the collimated beam through the target aperture and to the detector. A geometric calibration phantom having a plurality of radio-opaque markers is disposed in the path of the collimated beam. This arrangement is modified to operate as a regular intraoral imaging device by accommodating a high-power central source at the same or different distances as other sources from the detector and displacing the phantom from the field of view.

    INTRAORAL X-RAY SYSTEM
    8.
    发明申请
    INTRAORAL X-RAY SYSTEM 有权

    公开(公告)号：US20230049019A1

    公开(公告)日：2023-02-16

    申请号：US17792000

    申请日：2020-12-29

    Applicant: CARESTREAM DENTAL LLC

    Inventor： Jean-Marc INGLESE ,  David ROUDERGUES ,  Arnaud CAPRI ,  Subramanyan KRISHNAMOORTHY ,  Vincent LOUSTAUNEAU

    IPC: A61B6/14 ,  A61B6/00

    Abstract: An intraoral x-ray system mountable to a dentist’s office wall including components movable to compensate for defects in the wall’s flatness or the wall not being sufficiently perpendicular to the floor. The system also includes monitoring and compensation capabilities to compensate for drift in the position of the system’s x-ray source or patient movement before and during x-ray imaging, thereby avoiding the need for the taking of additional x-ray images and exposing the patient unnecessarily to extra x-ray dose. Additionally, the system further includes a data/signal processing unit that allows the x-ray source to be precisely moved along a predetermined trajectory and allows the system to perform computed tomosynthesis examinations of a patient. In addition, the x-ray source is attachable/detachable from the system’s robotic arm, with the system compensating automatically for the change in weight at the robotic arm’s end due to removal of the x-ray source.

    IMPROVED METAL ARTIFACTS REDUCTION IN CONE BEAM RECONSTRUCTION
    9.
    发明申请
    IMPROVED METAL ARTIFACTS REDUCTION IN CONE BEAM RECONSTRUCTION 有权

    公开(公告)号：US20220110596A1

    公开(公告)日：2022-04-14

    申请号：US17419081

    申请日：2019-12-29

    Applicant: CARESTREAM DENTAL LLC

    Inventor： Jay S. SCHILDKRAUT ,  Jean-Marc INGLESE

    IPC: A61B6/00 ,  A61B6/14 ,  A61B6/03

    Abstract: The present disclosure describes methods and apparatuses for reducing metal artifacts in cone beam computed tomography (CBCT) reconstructions. The methods use multiple imaging modalities to identify and locate metal present in a region of dental patients mouth and to generate a reconstructed 3-D volume image of the region with reduced metal artifacts using data obtained by the multiple modalities. According to example embodiments, the methods include creating a metal map using data from a first imaging modality and an initial 3-D reconstruction from data obtained from a second imaging modality including CBCT imaging. The metal map is registered to the initial 3-D reconstruction with a reconstructed metal map and projection metal maps being subsequently produced and applied to projections from the CBCT imaging to generate interpolated projections. An artifact reduced 3-D reconstruction is produced from the interpolated projections and a final 3-D reconstruction is created therefrom including merged metal information.

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