Evaluation of a new electromagnetic tracking system using a standardized assessment protocol

Area of Science:

• Medical instrumentation
• Electromagnetic tracking systems

Background:

• Accurate tracking is crucial for image-guided surgery and interventions.
• Electromagnetic tracking systems offer advantages but can be susceptible to interference.
• Evaluating new systems is essential for advancing medical technology.

Purpose of the Study:

• To assess the accuracy and performance of the newly released 6 degrees of freedom Aurora electromagnetic tracking system.
• To propose a method for ongoing performance monitoring of the tracking system.
• To investigate the impact of metallic objects on the system's accuracy.

Main Methods:

• Utilized a published protocol for system evaluation.
• Employed a machined base plate to measure positional and orientational errors.
• Assessed the influence of metallic objects within the system's operating volume.
• Quantified positional jitter (E(RMS)), relative positional error at various offsets, and rotational errors.

Main Results:

• Positional jitter was measured at 0.17 mm +/- 0.19 mm.
• Relative positional errors were 0.25 mm +/- 0.22 mm at 50 mm and 0.97 mm +/- 1.01 mm at 300 mm offsets.
• Mean rotational errors were 0.20 degrees +/- 0.14 degrees (axial) and 0.91 degrees +/- 0.68 degrees (longitudinal).
• 400-series stainless steel caused the most significant distortion, with a maximum error of 9.4 mm.
• The new Aurora system shows substantial accuracy improvements compared to previous generations.

Conclusions:

• The new Aurora electromagnetic tracking system demonstrates significant improvements in accuracy.
• The proposed performance monitoring protocol can ensure reliable system operation over time.
• Understanding and mitigating metallic interference is key for optimal performance in clinical settings.