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Proceedings Paper

Intraoperative positioning of mobile C-arms using artificial fluoroscopy
Author(s): Philipp Dressel; Lejing Wang; Oliver Kutter; Joerg Traub; Sandro-Michael Heining; Nassir Navab
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Paper Abstract

In trauma and orthopedic surgery, imaging through X-ray fluoroscopy with C-arms is ubiquitous. This leads to an increase in ionizing radiation applied to patient and clinical staff. Placing these devices in the desired position to visualize a region of interest is a challenging task, requiring both skill of the operator and numerous X-rays for guidance. We propose an extension to C-arms for which position data is available that provides the surgeon with so called artificial fluoroscopy. This is achieved by computing digitally reconstructed radiographs (DRRs) from pre- or intraoperative CT data. The approach is based on C-arm motion estimation, for which we employ a Camera Augmented Mobile C-arm (CAMC) system, and a rigid registration of the patient to the CT data. Using this information we are able to generate DRRs and simulate fluoroscopic images. For positioning tasks, this system appears almost exactly like conventional fluoroscopy, however simulating the images from the CT data in realtime as the C-arm is moved without the application of ionizing radiation. Furthermore, preoperative planning can be done on the CT data and then visualized during positioning, e.g. defining drilling axes for pedicle approach techniques. Since our method does not require external tracking it is suitable for deployment in clinical environments and day-to-day routine. An experiment with six drillings into a lumbar spine phantom showed reproducible accuracy in positioning the C-arm, ranging from 1.1 mm to 4.1 mm deviation of marker points on the phantom compared in real and virtual images.

Paper Details

Date Published: 23 February 2010
PDF: 6 pages
Proc. SPIE 7625, Medical Imaging 2010: Visualization, Image-Guided Procedures, and Modeling, 762506 (23 February 2010); doi: 10.1117/12.843958
Show Author Affiliations
Philipp Dressel, Technische Univ. München (Germany)
Lejing Wang, Technische Univ. München (Germany)
Oliver Kutter, Technische Univ. München (Germany)
Joerg Traub, Technische Univ. München (Germany)
Sandro-Michael Heining, Ludwig-Maximilians-Univ. München (Germany)
Nassir Navab, Technische Univ. München (Germany)


Published in SPIE Proceedings Vol. 7625:
Medical Imaging 2010: Visualization, Image-Guided Procedures, and Modeling
Kenneth H. Wong; Michael I. Miga, Editor(s)

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