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Abstract #4641

Performance of Stereo Vision and Retro-Grate Reflector Motion Tracking Systems in the Space Constraints of an MR Scanner

Brian Armstrong1, Brian Andrews-Shigaki2, Robert T. Barrows1, Todd P. Kusik1, Thomas Ernst2, Oliver Speck3

1Electrical Engineering and Computer Science, UW-Milwaukee, Milwaukee, WI, USA; 2Medicine, University of Hawaii, Honolulu, HI, USA; 3Biomedical Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Germany

Motion tracking and prospective compensation is one approach to reducing motion artifact in MR scans. Optical motion tracking is a leading candidate method to obtain the needed real-time motion data. The repeatability and accuracy of two optical motion tracking systems, stereo vision (SV) and retro-grate reflector (RGR), are investigated under the space constraints of an MR scanner. An optical bench and precision tilting rotary table provide geometric stability and highly accurate presentation of poses. Results indicate that achieving sufficiently accurate motion tracking in an MR bore remains a challenge for prospective motion compensation.