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Proceedings Paper

PC-based control unit for a head-mounted operating microscope for augmented-reality visualization in surgical navigation
Author(s): Michael Figl; Wolfgang Birkfellner; Franz Watzinger; Felix Wanschitz; Johann Hummel; Rudolf A. Hanel; Rolf Ewers; Helmar Bergmann
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Paper Abstract

Two main concepts of Head Mounted Displays (HMD) for augmented reality (AR) visualization exist, the optical and video-see through type. Several research groups have pursued both approaches for utilizing HMDs for computer aided surgery. While the hardware requirements for a video see through HMD to achieve acceptable time delay and frame rate seem to be enormous the clinical acceptance of such a device is doubtful from a practical point of view. Starting from previous work in displaying additional computer-generated graphics in operating microscopes, we have adapted a miniature head mounted operating microscope for AR by integrating two very small computer displays. To calibrate the projection parameters of this so called Varioscope AR we have used Tsai's Algorithm for camera calibration. Connection to a surgical navigation system was performed by defining an open interface to the control unit of the Varioscope AR. The control unit consists of a standard PC with a dual head graphics adapter to render and display the desired augmentation of the scene. We connected this control unit to a computer aided surgery (CAS) system by the TCP/IP interface. In this paper we present the control unit for the HMD and its software design. We tested two different optical tracking systems, the Flashpoint (Image Guided Technologies, Boulder, CO), which provided about 10 frames per second, and the Polaris (Northern Digital, Ontario, Canada) which provided at least 30 frames per second, both with a time delay of one frame.

Paper Details

Date Published: 17 May 2002
PDF: 10 pages
Proc. SPIE 4681, Medical Imaging 2002: Visualization, Image-Guided Procedures, and Display, (17 May 2002); doi: 10.1117/12.466983
Show Author Affiliations
Michael Figl, Vienna General Hospital (Austria)
Wolfgang Birkfellner, Vienna General Hospital and Kantonsspital Basle (Switzerland)
Franz Watzinger, Vienna General Hospital (Austria)
Felix Wanschitz, Vienna General Hospital (Austria)
Johann Hummel, Vienna General Hospital (Austria)
Rudolf A. Hanel, Vienna General Hospital (Austria)
Rolf Ewers, Vienna General Hospital (Austria)
Helmar Bergmann, Vienna General Hospital and Ludwig-Boltzmann Institute of Nuclear Medicine (Austria)

Published in SPIE Proceedings Vol. 4681:
Medical Imaging 2002: Visualization, Image-Guided Procedures, and Display
Seong Ki Mun, Editor(s)

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