Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    A geometric calibration method for an open cone-beam CT system
    ( 2013)
    Stopp, Fabian
    ;
    Wieckowski, Adam
    ;
    Käseberg, Marc
    ;
    Engel, Sebastian
    ;
    Fehlhaber, Felix
    ;
    Keeve, Erwin
    The image quality of cone-beam CT systems depends directly on the precise knowledge of position and orientation of the X-ray source and the detector. The current methods to determine this geometric information are mainly focused on conventional cone-beam CTs with planar or near-planar scanning trajectories. Due to the fixed alignment of X-ray source and detector, such systems have disadvantages in intraoperative use. Therefore, we develop a first prototype for cone-beam CT characterized by a free alignment of X-ray source and detector. This results in an open system allowing an intraoperative access to the patient and the implementation of non-planar scanning trajectories in the operating room. In this paper, we present a geometric calibration method to determine the position and orientation of X-ray source and detector for any arbitrary projection. Enhancing the theoretical method proposed in Mennessier et al. [1] by introducing an asymmetrical marker arrangement, we realized a calibration method suitable for practical use. We analyzed the resulting accuracy and applied our approach to the open cone-beam CT prototype.
  • Publication
  • Patent
    Röntgenquelle mit Modul und Detektor für optische Strahlung
    ( 2012)
    Keeve, Erwin
    ;
    Stopp, F.
    ;
    Käseberg, Marc
    ;
    Engel, S.
    ;
    Uhlmann, Eckart
    The present invention relates to an X-ray source (2) for irradiating an object (8) to be imaged with X-ray radiation, wherein the X-ray source (2) is moveable into a plurality of defined recording positions relative to the object (8) to be imaged. A module (4, 5, 13) is arranged directly on the X-ray source, said module being designed to project a marking onto the object (8) to be imaged and/or to check a position of the object (8) to be imaged and/or of the marking, wherein the module for checking the position of the object (8) to be imaged and/or of the marking comprises a detector (5) for optical radiation. In addition, the present invention relates to an X-ray device (6) comprising the X-ray source (2) and a method for using the X-ray device (6).