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Proceedings Paper

Online temporal synchronization of pose and endoscopic video streams
Author(s): Özgür Güler; Ziv Yaniv; Wolfgang Freysinger
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Paper Abstract

Computer assisted navigation systems that combine real-time endoscopy images with pre-operative volumetric data sets aim at improving the physician's understanding of the underlying anatomical structures. To achieve accurate and safe guidance these systems are required to provide a consistent representation of the physical world. This implies that all data streams are synchronized. In our case, we are dealing with synchronization of tracking data and a video stream obtained by a tracked endoscope. Previously, such synchronization was obtained pre-operatively using phantoms. This type of approach assumes a constant latency between the data streams and is less desirable for clinical use due to the required additional hardware. In this work we describe an online temporal synchronization method. The method is based on the observation that in clinical practice the endoscope is not in constant motion. By identifying corresponding stationary points in the video and tracking streams temporal synchronization can be performed online in a manner that is transparent to the user. Initial evaluation of our approach in a laboratory study has shown that it provides comparable estimates to a phantom based approach we had previously proposed.

Paper Details

Date Published: 1 March 2011
PDF: 10 pages
Proc. SPIE 7964, Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling, 79641M (1 March 2011);
Show Author Affiliations
Özgür Güler, Innsbruck Medical Univ. (Austria)
Ziv Yaniv, Georgetown Univ. Medical Ctr. (United States)
Wolfgang Freysinger, Innsbruck Medical Univ. (Austria)

Published in SPIE Proceedings Vol. 7964:
Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling
Kenneth H. Wong; David R. Holmes III, Editor(s)

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