Abstract
Purpose
A main task of navigation systems assisting a surgeon during an intervention is to determine the spatial position of instruments relative to the organ. In comparison to navigation of hard tissue, this is still a challenge for navigation in soft tissue. In this contribution a method is presented to measure the position and the deformation of the liver.
Method
Therefore, reflective fiducials are fixed at the surface of the liver, whose spatial positions are measured with an optical position measurement system. Therewith the position of the whole liver is calculated. The deformation at the surface of the liver is determined using a model of the surface. The method was verified in an experiment with pig liver.
Results
The position of the liver could be tracked. Spatial deviations because of the deformation of the liver could be reduced by 36%.
Conclusion
This method can be applied in navigation of instruments in open liver surgery to track the position of the liver.
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Markert, M., Koschany, A. & Lueth, T. Tracking of the liver for navigation in open surgery. Int J CARS 5, 229–235 (2010). https://doi.org/10.1007/s11548-009-0395-x
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DOI: https://doi.org/10.1007/s11548-009-0395-x