Optical head tracking for functional magnetic resonance imaging using structured light
Andrei A. Zaremba, Duncan L. MacFarlane, Wei-Che Tseng, Andrew J. Stark, Richard W. Briggs, Kaundinya Gopinath, Sergey Cheshkov, Keith D. White · Journal of the Optical Society of America A · 2008
An accurate motion-tracking technique is needed to compensate for subject motion during functional magnetic resonance imaging (fMRI) procedures. Here, a novel approach to motion metrology is discussed. A structured light pattern specifically coded for digital signal processing is positioned onto a fiduciary of the patient. As the patient undergoes spatial transformations in 6 DoF (degrees of freedom), a high-resolution CCD camera captures successive images for analysis on a computing platform. A high-speed image processing algorithm is used to calculate spatial transformations in a time frame commensurate with patient movements (10-100 ms) and with a precision of at least 0.5 microm for translations and 0.1 deg for rotations.