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A geometric calibration method for an open cone-beam CT system

: Stopp, Fabian; Wieckowski, Adam; Käseberg, Marc; Engel, Sebastian; Fehlhaber, Felix; Keeve, Erwin

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Leahy, R.:
Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine. Proceedings : June 16-21, 2013, Granlibakken Resort, Lake Tahoe, California
Lake Tahoe/Calif., 2013
International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D) <12, 2013, Lake Tahoe/Calif.>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPK ()

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.