Optical sensor position indicator for neonatal MEG.
We have developed an inexpensive PC camera-based system to measure sensor position and to track head motion during magnetoencephalography 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 3-D position within the required volume of interest with an accuracy of ~450 μm and can be constructed for approximately $150.
Department of Medical Physics, University of Wisconsin, Madison, WI 53706, USA. eurban@wisc.edu
Erich
E
Urban
Ronald T
RT
Wakai
D016477:Artifacts; D001931:Brain Mapping / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D015225:Magnetoencephalography / Q000295:instrumentation*; D055096:Optical Devices; D011296:Prenatal Diagnosis / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers