Wireless magnetic tracking system for radiation therapy

This paper presents a wireless position and orientation tracking system for radiation therapy. The proposed system uses only four transmitting coils and an implantable wireless transponder. The four transmitting coils generate magnetic field which is sensed and measured by a bi-axial sensor in the transponder in the tumor. A wireless transmitter in the transponder transmits the information back to a computer to determine the position and orientation of the transponder and hence, to track the tumor in real time. The algorithm of tracking is implemented using MATLAB, and simulation results and analysis are presented. Each calculation of the position tracking takes 20 ms, which makes the proposed system suitable for real-time tracking of the transponder for radiation assessment and delivery.