The application of navigational support is commonly accepted in CMF surgery for several indications. Still the use is limited to those medical centers that can effort the costs for a navigation system. Usually the navigation systems provide information (e.g. an anatomical structure of interest) in 2D cross-section in three different directions. A pointer-tool is used to define the actual position of the instruments inside the working volume. In this paper we propose a cost effective real-time augmented reality approach using an off-the-shelf tablet PC in combination with novel 2D/3D point correspondence mapping techniques. The two proposed point pattern matching algorithms are tailored towards moderate projective distortions and computational low-power devices. The Android guidance application provides a 3D display of all relevant structures. The system was tested, evaluated and validated in the laboratory environment on a concrete medical indication (removal of an intraosseous tumour with security margins) by surgeons with experience in navigation as well as absolutely unexperienced students of dentistry. It could be shown, that the tablet navigation is simple and intuitive. As it allows to perform interventions with the same accuracy like with ‘classical’ navigation, it could become a cost-effective alternative to the existing systems.
Surgical navigation on tablet PC—feasibility study with a newly developed navigation system
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