Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    An approach for parallelization of GPU based iterative cone beam reconstruction algorithms
    ( 2011)
    Käseberg, M.
    ;
    Stopp, F.
    ;
    Winne, C.
    ;
    Keeve, E.
  • Publication
    Quality evaluation of image recording strategies for limited angle tomography
    ( 2010)
    Stopp, F.
    ;
    Winne, C.
    ;
    Jank, E.
    ;
    Keeve, E.
    In this paper we propose a new method for evaluating image recording strategies for limited angle tomography. In limited angle tomography exact three-dimensional (3-D) reconstruction is not achievable. With this method a metric for the reachable reconstruction quality by defined X-ray source trajectories is calculated. The result of our method is independent of reconstruction algorithms. Our approach is based on the gradients of the scanned volume and their grade of determinability. Compared to simulated reconstruction accuracy with simultaneous algebraic reconstruction techniques, the method of evaluation shows the same dependencies on X-ray source trajectories. By using the proposed method different source trajectories for a limited angle range are comparable with respect to the reachabl e reconstruction quality.
  • Publication
    Multi GPU Kegelstrahlvolumentomographie für iterative Rekonstruktionsalgorithmen
    ( 2010)
    Käseberg, M.
    ;
    Winne, C.
    ;
    Stopp, F.
    ;
    Keeve, E.
    Iterative Rekonstruktionsalgorithmen ermöglichen optimale Bildqualitäten in der digitalen Volumentomographie, insbesondere bei geringer Bildanzahl oder gestörten Bilddaten. Der hohe Berechnungsaufwand erschwert jedoch den Einsatz im klinischen Alltag. Implementierungen auf Basis von Grafikprozessoren (GPU) führen zu erheblichen Beschleunigungen. In diesem Beitrag wird eine Methode vorgestellt, mit der die Rekonstruktionsberechnungen eines simultanen algebraischen Rekonstruktionsalgorithmus auf mehrere GPUs verteilt werden. Erste Ergebnisse zeigen, dass bei gleichbleibender Bildqualität ein erheblicher Geschwindigkeitszuwachs möglich ist.
  • Publication
    Optimierung von Röntgenprojektionsrichtungen für die winkelbeschränkte Tomographie
    ( 2010)
    Stopp, F.
    ;
    Winne, C.
    ;
    Käseberg, M.
    ;
    Keeve, E.
  • Publication
    A new method for evaluation of x-ray imaging trajectories for limited angle tomography
    ( 2009)
    Stopp, F.
    ;
    Winne, C.
    ;
    Jank, E.
    ;
    Keeve, E.
    In this paper we propose a new method for evaluation of image recording strategies for limited angle tomography. In limited angle tomography exact 3D reconstruction is not achievable. With our method a metric for the reachable reconstruction quality is calculated. The result is independent of reconstruction algorithms and only depends on the image recording strategy. Our approach is based on the gradients of the scanned volume and their grade of determinability. Our simulation results show that the relative reconstruction accuracy is similar to the simultaneous algebraic reconstruction technique. By using our method different x-ray source trajectories for a predefined limited angle range are now comparable with respect to the reconstruction quality.