公开(公告)号：US20220207794A1

公开(公告)日：2022-06-30

申请号：US17604045

申请日：2020-04-17

Applicant: DENTSPLY SIRONA Inc. ,  SIRONA DENTAL SYSTEMS GMBH

Inventor： Christina SARTI ,  Kai STANNIGEL ,  Michael ELVERS

IPC: G06T11/00

Abstract: The present invention relates to a method of metal artefact reduction in x-ray dental volume tomography, the method comprising: a step (S1) of obtaining two-dimensional x-ray images (1) or a sinogram (2) of at least part (v) of a patient jaw (3a), acquired through relatively rotating an x-ray source (4) and a detector (5) around the patient jaw (3a); the method being characterized by further comprising: a step (S2) of detecting metal objects (6) in the two-dimensional x-ray images (1) or the sinogram (2) by using at least a trained artificial intelligence algorithm to generate 2D masks (7) which represent the metal objects (6) in the two-dimensional x-ray images (1) or 3D masks which represent the metal objects (6) in the sinogram (2), respectively; and a step (S4; S5) of reconstructing a three dimensional tomographic image (8) respectively based on two-dimensional x-ray images (1) or the sinogram (2) and the 2D masks (7) or the 3D masks as generated.

公开(公告)号：US20250104182A1

公开(公告)日：2025-03-27

申请号：US18290839

申请日：2022-07-11

Applicant: DENTSPLY SIRONA Inc. ,  SIRONA DENTAL SYSTEMS GMBH

Inventor： Marco BERTLEFF ,  Tim BRAUN ,  Kai STANNIGEL

IPC: G06T3/06 ,  G06T7/11

Abstract: The present invention relates to a method for automatically generating a projection panoramic view (RPV) from a dental DVT volume of a patient, comprising the steps of; (S1) localizing dental relevant anatomical structures in the DVT volume by using a machine learning method; (S2) automatically placing a guide curve by optimizing it based on the position of the localized dental relevant anatomical structures; (S3) defining a projection region of the reprojection panoramic view using the placed guide curve without manual steps in the DVT volume so that the localized dental relevant anatomical structures are encompassed; (S4) creating the reprojection panoramic view by reprojecting the DVT volume in the defined projection region.

公开(公告)号：US20240331224A1

公开(公告)日：2024-10-03

申请号：US18290935

申请日：2022-07-11

Applicant: DENTSPLY SIRONA Inc. ,  SIRONA DENTAL SYSTEMS GMBH

Inventor： Marco BERTLEFF ,  Kai STANNIGEL

IPC: G06T11/00 ,  G06T7/00

CPC classification number: G06T11/006 ,  G06T7/0012 ,  G06T2207/10116 ,  G06T2207/30036 ,  G06T2211/441

Abstract: The present invention relates to a method for automatically generating a reprojection panoramic view (RPV) from a dental DVT volume of a patient, which is aligned with the course of the mandibular canal, comprising the following steps; (S1) localization of the mandibular canal, (S2) automatic definition of a projection region of the RPV, which comprises the following sub steps: (S2.1) automatically setting a guide curve in a plane perpendicular to the patient longitudinal axis using the localized mandibular canal; (S2.2) automatically defining a variable or constant thickness profile along the guide curve; (S2.3) Extruding the area defined by guide curve and thickness profile along the patient longitudinal axis; and (S3) generating the RPV by reprojecting the DVT volume in the defined projection region.

公开(公告)号：US20230009790A1

公开(公告)日：2023-01-12

申请号：US17780107

申请日：2020-11-27

Applicant: DENTSPLY SIRONA Inc.

Inventor： Johannes ULRICI ,  Kai STANNIGEL ,  Wolf BLECHER

IPC: A61B6/03 ,  A61B6/00

Abstract: A 3D X-ray device including an X-ray detector, an X-ray source and a computer. The X-ray detector and the X-ray source are moved about an object volume to be recorded on movement paths with a rotation of at least 185°. A number of X-ray projection images are recorded from different directions. X-rays irradiate the object volume in one of the irradiation directions and are captured by the detector. A 3D X-ray image of the object volume is calculated from the recorded X-ray projection images by a reconstruction method. The X-ray detector is arranged asymmetrically relative to a central axis through a center of rotation of the 3D X-ray device. A first fan beam and an opposite second fan beam rotated 180° form an overlap region. At least one X-ray filter is placed between the X-ray source and the object volume for attenuating an X-ray dose inside the overlap region.

公开(公告)号：US20230309938A1

公开(公告)日：2023-10-05

申请号：US18026617

申请日：2021-09-14

Applicant: DENTSPLY SIRONA Inc.

Inventor： Kai STANNIGEL ,  Stefan EICHNER ,  Michael ELVERS

IPC: A61B6/00 ,  G06T7/00

CPC classification number: A61B6/501 ,  G06T7/0012 ,  G06T2207/10116 ,  G06T2207/20084

Abstract: A method for generating a panoramic image with reduced overlapping of neighboring teeth, including: acquiring 2D x-ray images respectively at a different radiographic directions by a rotating an x-ray source and an x-ray detector around the jaw of a patient. It includes a step of identifying one or more regions each including at least one pair of overlapping neighboring teeth in the 2D x-ray images and/or in temporary panoramic images reconstructed from the 2D x-ray images for which an optimal radiographic directions are determined, among the corresponding radiographic directions, which reduces the overlap in the panoramic image to be reconstructed. It includes determining one or more optimal radiographic directions respectively among the corresponding radiographic directions of the 2D x-ray images for which one or more regions each including at least one pair of overlapping neighboring teeth has been identified, to reduce the overlaps in the panoramic image to be reconstructed.