We have developed an inexpensive PC camera-based system to measure sensor position and to track head motion during MEG recordings. The system employs mirrors to triangulate the position of markers using a single camera. Sensor position measurement and head tracking can be performed without the need to manually digitize markers or fiducial points. The system is capable of measuring relative 3D position within the required volume of interest with an accuracy of ~450μm, and can be constructed for approximately $150.
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