Dentsply Sirona Inc.

Sirona Dental Systems Gmbh

Kai Stannigel

Michael Elvers

Johannes Ulrici

Stefan Eichner

Wolf Blecher

Christina Sarti

Tim Braun

Marco Bertleff

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.

X-ray imaging method and system for reducing overlapping of neighboring teeth in panoramic images

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

Method of metal artefact reduction in x-ray dental volume tomography

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.

3D X-ray device and method for producing a 3D X-ray image

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Weinheim, Germany

Kai Stannigel