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Electromagnetic tracking system with reduced distortion using quadratic excitation.

Tomasz Bien1, Mengfei Li, Zein Salah

  • 1Chair for Healthcare Telematics and Medical Engineering, Otto-von-Guericke University, Magdeburg, Germany, Tomasz.Bien@ovgu.de.

International Journal of Computer Assisted Radiology and Surgery
|August 7, 2013
PubMed
Summary

Electromagnetic tracking systems can be improved for minimally invasive surgery by using quadratic excitation, which significantly reduces errors caused by conductive distortions compared to traditional sinusoidal methods.

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Area of Science:

  • Medical Devices
  • Surgical Technology
  • Electromagnetism

Background:

  • Electromagnetic tracking systems are crucial for navigation in minimally invasive surgery.
  • These systems are susceptible to interference from conductive materials, impacting accuracy.
  • Modifying magnetic fields offers a potential solution to mitigate distorter effects.

Purpose of the Study:

  • To develop and evaluate a novel method for reducing the impact of conductive distorters on electromagnetic tracking accuracy.
  • To investigate the efficacy of magnetic field modification through quadratic excitation.

Main Methods:

  • Utilized the difference in voltage induction (first vs. second derivative) caused by conductive distorters.
  • Implemented a quadratic excitation voltage for the emitting coil, adapting to distortion levels.
  • Evaluated the approach using an experimental electromagnetic tracking system setup.

Main Results:

  • Maximal error reduced from 10.9 mm to 3.8 mm with quadratic excitation versus sinusoidal.
  • Root mean square error near a conductive distorter decreased from 3.5 mm to 1.6 mm.
  • Demonstrated significant accuracy improvements in the presence of conductive interference.

Conclusions:

  • Quadratic excitation renders electromagnetic tracking immune to conductive distorter effects, outperforming sinusoidal methods.
  • This technique shows significant promise for enhancing the reliability of electromagnetic tracking in computer-assisted surgery.
  • The findings support the clinical applicability of quadratic excitation for improved surgical navigation.