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MAGNETS: Magnetic Needle Tracking System Vladimir Sibinović¹, Bojana Petković², Goran Đor đ ević¹ ¹ University of Niš, Faculty of Electronic Engineering ² University of applied sciences, Erfurt
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Outline Introduction System Interferences Symmetry Statistical analysis of data Conclusion Further work References
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Introduction Part of project II44004, HUMANISAM, which is financed by Serbian Ministry of Science Percutaneous Vertebroplasty – PVP Providing structural support for fractured and weaken vertebra Design and realization of a system for magnetic tracking of the needle during PVP
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System Based on Hall-effect sensors Senis GmbH; Sentronis AD
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Magnet and needle Axial polarization Needle for PVP
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Interferences Are there interferences from the presence of human body?
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Symmetry Symmetry of data due to symmetry of the system Can be an advantage in further development Elimination of excess measurements Substitution of the sensors
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Symmetry – graph
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Statistical analysis of data Statistics gives the best view of a large data set Mean, Standard deviation, Variance SensorChannelMeanStdVar 1 X 14.81070.41190.1696 Y -130.40280.37850.1433 Z 1055.90120.35470.1258
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Boxplot
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Conclusion We proven the hypothesis that the movement of the needle can be detected with Hall-effect The system is precise, but the actual precision is yet to be determine Data are consistent and repetitive System is immune to the interferences that can accrue during the procedure
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Further work Transformation of measured voltage values in to the position of the magnet, and with that the position of the needle Combination with X-ray fluoroscopy Determining the exact precision of the system
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References K. Gary, L. Ibanez and S. Aylward, D. Gobbi, M. B. Blake and K. Cleary, “IGSTK: An Open Source Software Toolkit for Image- Guided Surgery,” IEEE Computer, April 2006. S. M. Samani, M. Yazdi, M. H. Bagheri, “Automatic Identification of Needle’s Entrance Point and Angle in Vertebroplasty,” IEEE international Conference on Signal and Image Processing Applications, 2009. Senis GmbH, http://senis.ch/new-tranducer_data_sheets.html The MathWorks, Inc. MATLAB, www.mathworks.com Wikipedia, http://www.wikipedia.org/
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Questions ? Thank you for your time
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