Abstract

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 $(10–100\mathrm{ms})$ and with a precision of at least $0.5\mathrm{\mu }\mathrm{m}$ for translations and $0.1\mathrm{deg}$ for rotations.

© 2008 Optical Society of America

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