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27 February 2010A novel technique for analysis of accuracy of magnetic
tracking systems used in image guided surgery
With the increased use and development of image-guided surgical applications, there is a need for methods of
analysis of the accuracy and precision of the components which compose these systems. One primary component
of an image-guided surgery system is the position tracking system which allows for the localization of a tool within
the surgical field and provides information which is translated back to the images. Previously much work has been
done in characterizing these systems for spatial accuracy and precision. Much of this previous work examines
single tracking systems or modalities. We have devised a method which allows for the characterization of a novel
tracking system independent of modality and location. We describe the development of a phantom system which
allows for rapid design and creation of surfaces with different geometries. We have also demonstrated a method of
analysis of the data generated by this phantom system, and used it to compare Biosense-Webster's CartoXPTM,
and Northern Digital's AuroraTMmagnetic trackers. We have determined that the accuracy and precision of the
CartoXP was best, followed closely by the Aurora's dome volume, then the Aurora's cube volume. The mean
accuracy for all systems was better than 3mm and decays with distance from the field generator.
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David M. Kwartowitz, Marayam E. Rettmann, David R. Holmes III, Richard A. Robb, "A novel technique for analysis of accuracy of magnetic tracking systems used in image guided surgery," Proc. SPIE 7625, Medical Imaging 2010: Visualization, Image-Guided Procedures, and Modeling, 76251L (27 February 2010);