Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Surgical navigation with QR codes
    ( 2016)
    Katanacho, Manuel
    ;
    Cadena, Wladimir de la
    ;
    Engel, Sebastian
    The presented work is an alternative to established measurement systems in surgical navigation. The system is based on camera based tracking of QR code markers. The application uses a single video camera, integrated in a surgical lamp, that captures the QR markers attached to surgical instruments and to the patient.
  • Publication
    3D human face reconstruction for surgical navigation
    ( 2016)
    Katanacho, Manuel
    ;
    Hoffmann, Jonas
    ;
    Engel, Sebastian
  • Publication
    Visuelle Navigation - Systemkonzept für die navigierte Chirurgie
    ( 2015)
    Katanacho, Manuel
    ;
    Engel, Sebastian
    ;
    Winne, Christian
    ;
    Özbek, Christopher
    ;
    Kosmecki, Bartosz
    ;
    Keeve, Erwin
    Es wird ein Videobild-basiertes Systemkonzept für die navigierte Chirurgie vorgestellt. Durch eine in chirurgische Instrumente integrierte Kamera wird eine Oberflächenkarte im Sichtfeld der Kamera berechnet und simultan die Lage der Kamera in der Oberflächenkarte bestimmt. Die Oberflächenkarte wird mit präoperativ aufgenommenen CT-Daten registriert, wodurch die Instrumentenlage relativ zum Patienten bekannt ist. Ziel des neuen Ansatzes ist es, chirurgische Navigationssysteme durch die integrierte Messtechnik intuitiver und platzsparender umzusetzen.
  • 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.