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Related Experiment Video

Updated: Apr 24, 2026

Technical Approach for Infrared Tracking for Soft Tissue Navigation with a Holographic Head-Mounted Display and Preclinical Validation
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Electromagnetic tracking in surgical and interventional environments: usability study.

Elodie Lugez1, Hossein Sadjadi, David R Pichora

  • 1Laboratory for Percutaneous Surgery, School of Computing, Queen's University, Kingston, ON, K7L 3N6, Canada.

International Journal of Computer Assisted Radiology and Surgery
|September 7, 2014
PubMed
Summary
This summary is machine-generated.

Electromagnetic (EM) tracking accuracy varies with environment and sensor orientation. Pre-calibration is essential for reliable EM tracking in CT scanner environments, improving performance by 50-85%.

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Area of Science:

  • Medical Imaging
  • Surgical Navigation
  • Biomedical Engineering

Background:

  • Electromagnetic (EM) tracking systems are crucial for instrument navigation in clinical settings.
  • EM tracking performance is known to fluctuate, particularly in environments with imaging scanners.
  • Understanding these fluctuations is key to improving surgical accuracy and safety.

Purpose of the Study:

  • To characterize the position location measurement uncertainty of an EM system.
  • To evaluate the static and dynamic effects of cone beam computed tomography (CBCT) and CT scanning on EM tracking.
  • To assess EM tracking performance across different environments: control, clinical, CBCT, and CT scanners.

Main Methods:

  • Developed specialized guidance devices to isolate sensor translation and rotation, decoupling pose-dependent uncertainties.
  • Utilized a standardized base for consistent and repeatable testing across various environments.
  • Assessed position and orientation accuracy, precision, and 95% confidence intervals.

Main Results:

  • Tracking performance significantly varied with environment (especially CBCT and CT scanners) and sensor pose.
  • Measurement error at a fixed clinical position ranged from 0.2 to 2.2 mm based on sensor orientation.
  • Calibration improved EM tracking performance in CT environments by 50-85%.

Conclusions:

  • EM tracking offers effective assistance for procedures in clinical or CBCT environments.
  • Acceptable performance in CT scanners necessitates pre-calibration.
  • Optimized EM tracking protocols can enhance surgical and interventional radiology procedures.