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Distortion-Free Magnetic Tracking of Metal Instruments in Image-Guided Interventions.

Eoin Higgins1,2, Daragh Crowley1,2, Christian van den Bosch1,2

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This summary is machine-generated.

Electromagnetic tracking (EMT) distortion from metal surgical tools can be minimized. Optimal transmitter frequencies and smaller tool diameters improve accuracy in image-guided interventions.

Keywords:
electromagnetic trackinginductive sensormagnetic modellingsurgical navigation

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Area of Science:

  • Medical Devices
  • Surgical Navigation
  • Electromagnetism

Background:

  • Electromagnetic tracking (EMT) is crucial for image-guided interventions, especially when direct visualization is obstructed.
  • Metal surgical instruments commonly used in various procedures can cause significant electromagnetic distortion, compromising EMT accuracy.
  • Existing EMT systems face challenges in maintaining precision due to the presence of metallic surgical tools.

Purpose of the Study:

  • To investigate the feasibility of tracking metal surgical instruments by integrating inductive sensors within their shafts.
  • To model and experimentally validate the magnetostatic field within metal instruments across a range of frequencies.
  • To quantify the impact of instrument properties and transmitter frequency on EMT distortion and identify mitigation strategies.

Main Methods:

  • Developed a magnetostatic model to simulate electromagnetic fields within metal instrument shafts.
  • Conducted experimental validation for frequencies ranging from 6 kHz to 60 kHz.
  • Utilized the open-source Anser EMT system to track instruments and quantify distortion as a function of transmitter coil frequency.

Main Results:

  • Quantified the influence of instrument dimensions, conductivity, and transmitting field frequency on EMT distortion.
  • Demonstrated that smaller tool diameters (under 8 mm) exhibit less susceptibility to distortion.
  • Identified optimal transmitter frequencies (1 kHz to 2 kHz) for minimizing distortion in larger instruments.

Conclusions:

  • Tracking metal instruments by placing sensors within their shafts is feasible.
  • Tool diameter and transmitter frequency are critical factors influencing EMT accuracy in the presence of metal.
  • The study provides design guidelines for improved EMT systems in image-guided surgery.