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Accuracy assessment protocols for electromagnetic tracking systems.

D D Frantz1, A D Wiles, S E Leis

  • 1Northern Digital, Inc, 103 Randall Drive, Waterloo, Ontario N2V 1C5, Canada.

Physics in Medicine and Biology
|August 5, 2003
PubMed
Summary

This study addresses challenges in assessing electromagnetic tracking systems for medical use. It introduces a method to separate

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Area of Science:

  • Medical instrumentation
  • Spatial measurement systems
  • Electromagnetic tracking technology

Background:

  • Electromagnetic tracking systems are increasingly used in medical applications.
  • Complex spatial measurement leads to non-uniform error distributions, complicating accuracy assessments.
  • Existing assessment protocols can yield inconclusive or contradictory results.

Purpose of the Study:

  • To examine major issues in assessing electromagnetic tracking system performance.
  • To discuss useful calibration protocols for these systems.
  • To present a method for disentangling 'trueness' and 'precision' in measurement accuracy.

Main Methods:

  • Analysis of error distributions in electromagnetic tracking systems.
  • Evaluation of three distinct calibration protocols.

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  • Development of a novel method to independently assess trueness and precision.

    • Main Results:

    • Identified difficulties in judging system suitability due to complex error patterns.
    • Demonstrated a method to separate systematic (trueness) and statistical (precision) errors.
    • Highlighted the applicability of findings beyond electromagnetic tracking systems.

    Conclusions:

    • Accurate assessment of electromagnetic tracking systems requires disentangling trueness and precision.
    • The proposed method provides a clearer understanding of measurement error components.
    • Improved assessment methodologies enhance the reliable application of spatial measurement systems in medicine.