Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
  • 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.
  • Patent
    Detektoranordnung zum Aufnehmen von Röntgenbildern eines abzubildenden Objekts
    ( 2012)
    Keeve, E.
    ;
    Engel, S.
    ;
    Stopp, F.
    ;
    Käseberg, Marc
    ;
    Uhlmann, Eckart
    The invention relates to a detector assembly (1) for recording x-ray images of an object (29) to be imaged, said object being located on a support plate of a table, wherein the table has at least one adjustable support foot for moving the support plate, comprising: a detector (12) for detecting x-radiation and a positioning device (13) for moving the detector (12) relative to the object (29), wherein the detector (12) can be moved into a plurality of recording positions that are spatially fixed with respect to the object (29) and the positioning device can be fastened to the support foot in such a way that the positioning device is moved together with the support plate and the positioning device has at least one articulated arm, which can be moved with respect to at least one axis of rotation (99, 100, 101) and/or one linear axis.
  • 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).