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Proceedings Paper

Technical experience from clinical studies with INPRES and a concept for a miniature augmented reality system
Author(s): Gunther Sudra; Ruediger Marmulla; Tobias Salb; Tilo Gockel; Georg Eggers; Bjoern Giesler; Sassan Ghanai; Dominik Fritz; Ruediger Dillmann; Joachim Muehling
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Paper Abstract

This paper is going to present a summary of our technical experience with the INPRES System -- an augmented reality system based upon a tracked see-through head-mounted display. With INPRES a complete augmented reality solution has been developed that has crucial advantages when compared with previous navigation systems. Using these techniques the surgeon does not need to turn his head from the patient to the computer monitor and vice versa. The system's purpose is to display virtual objects, e.g. cutting trajectories, tumours and risk-areas from computer-based surgical planning systems directly in the surgical site. The INPRES system was evaluated in several patient experiments in craniofacial surgery at the Department of Oral and Maxillofacial Surgery/University of Heidelberg. We will discuss the technical advantages as well as the limitations of INPRES and present two strategies as a result. On the one hand we will improve the existing and successful INPRES system with new hardware and a new calibration method to compensate for the stated disadvantage. On the other hand we will focus on miniaturized augmented reality systems and present a new concept based on fibre optics. This new system should be easily adaptable at surgical instruments and capable of projecting small structures. It consists of a source of light, a miniature TFT display, a fibre optic cable and a tool grip. Compared to established projection systems it has the capability of projecting into areas that are only accessible by a narrow path. No wide surgical exposure of the region is necessary for the use of augmented reality.

Paper Details

Date Published: 12 April 2005
PDF: 8 pages
Proc. SPIE 5744, Medical Imaging 2005: Visualization, Image-Guided Procedures, and Display, (12 April 2005); doi: 10.1117/12.595374
Show Author Affiliations
Gunther Sudra, Univ. of Karlsruhe (Germany)
Ruediger Marmulla, Univ. of Heidelberg (Germany)
Tobias Salb, Univ. of Karlsruhe (Germany)
Tilo Gockel, Univ. of Karlsruhe (Germany)
Georg Eggers, Univ. of Heidelberg (Germany)
Bjoern Giesler, Univ. of Karlsruhe (Germany)
Sassan Ghanai, Univ. of Heidelberg (Germany)
Dominik Fritz, Univ. of Karlsruhe (Germany)
Ruediger Dillmann, Univ. of Karlsruhe (Germany)
Joachim Muehling, Univ. of Heidelberg (Germany)


Published in SPIE Proceedings Vol. 5744:
Medical Imaging 2005: Visualization, Image-Guided Procedures, and Display
Robert L. Galloway; Kevin R. Cleary, Editor(s)

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