The meaning of precision in computer assisted surgery
From the very start of the development of the TICC-processing chain the technique of prefabricating individual craniofacial implants based on geometric data. The subsequent use of this technique in navigation and robotics requires experiments on the preci
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The meaning of precision in computer assisted surgery M. Wehmollera, S. Weihe b, H. Eufingerb a Inst. of Production Systems b Dept. of Oral & Maxillofacial Surgery, Ruhr-University Bochum, Germany Keywords: CAS, resection, robotics 1. Introduction From the very start of the development of the nCC-processing chain the technique of prefabricating individual craniofacial implants based on geometric data. The subsequent use of this technique in navigation and robotics requires experiments on the precision of the involved techniques [I].
2. Methods Experimental studies showed the precision of the necessary steps and gave an idea of the meaning of precision in computer assisted surgery [2].
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Figure I. Robot resection in an ovine cadaver skull performed at the Inst. for Process Control & Robotics at the University of Karlsruhe, left: positions M2 - Mil, right: evaluation of precision at positions M2 - Mil
3. Results and Conclusions Each single step of computer assisted surgery has its own range of deviations, but for the whole processing chain the result is not simply the sum of all theoretical deviations. In contrast, deviations of up to 4 mm have been found in clinical practice for these systems, whereas our own experimental evaluation could demonstrate intraindividual and interindividual deviations of up to 2.42 mm with an average of 1.36 mm. Acknowledgements Supported by a grant of the German Research Foundation (DFG - Eu 4911-2). References 1. H. Eufinger, M. Wehmoller: Anwendung und Technik der computerunterstUtzten Implantatversorgung, Planung und Umsetzung gefUhrter Resektionen. In W. MaJ3berg, G. Reinhart, M. Wehmoller (eds.): Neue Technologien fUr die Medizin, ISBN 3-8265-7399-4 2. S. Weihe, M. Wehmoller, et al.: Synthesis of CAD/CAM, robotics, and biomaterial implant fabrication: single-step reconstruction in computer aided frontotemporal bone resection. Int. 1. Oral Maxillofac. Surg. 29, 2000, p 384
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