MAGNETS:Magnetic Needle Tracking System

Vladimir Sibinović¹, Bojana Petković², Goran Đorđević¹

¹ University of Niš, Faculty of Electronic Engineering

² University of applied sciences, Erfurt

Outline Introduction System Interferences Symmetry Statistical analysis of data Conclusion Further work References

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

System Based on Hall-effect sensors Senis GmbH; Sentronis AD

Magnet and needle Axial polarization Needle for PVP

Interferences Are there interferences from the presence of

human body?

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

Symmetry – graph

Statistical analysis of data Statistics gives the best view of a large data

set

Mean, Standard deviation, VarianceSensor Channel Mean Std Var

1

X14.8107 0.4119 0.1696

Y-130.4028 0.3785 0.1433

Z1055.9012 0.3547 0.1258

Boxplot

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

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

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/

Questions ?

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