A novel approach to wireless electromagnetic tracking using frequency modulation radio communication.

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Sensor Technology

Background:

• Electromagnetic tracking (EMT) is crucial for image-guided interventions, offering an alternative to radiation-based imaging.
• Wireless sensor integration is key to improving the usability of EMT systems for applications like catheter tracking and patient registration.

Purpose of the Study:

• To introduce and evaluate a novel method for wirelessly transmitting electromagnetic sensor data using frequency modulation (FM) radio.
• To enable untethered operation of EMT systems for enhanced flexibility in medical procedures.

Main Methods:

• The proposed FM transmission technique was integrated with the open-source Anser EMT system.
• An electromagnetic sensor was connected to an FM transmitter prototype and simultaneously to the Anser system for direct comparison.
• Performance was assessed using an optical tracking system as a gold standard across 125 test points within a defined volume.

Main Results:

• The FM-transmitted sensor achieved an average position accuracy of 1.61 ± 0.68 mm and angular accuracy of 0.04° over a 30 cm³ volume.
• Position precision for the FM signal was 0.95 mm, slightly outperforming the directly wired signal's 1.09 mm precision.
• A low-frequency oscillation was identified and compensated for by dynamically scaling the magnetic field model.

Conclusions:

• Frequency modulation (FM) transmission of electromagnetic sensor signals provides tracking performance comparable to wired systems.
• Wireless EMT using FM is a practical alternative to digital transmission methods like Bluetooth.
• Future development will focus on integrated wireless sensor nodes utilizing FM communication for compatibility with existing EMT systems.