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Abstract #5035

Catadioptric RGR Motion Tracking for Prospective Motion Compensation in MR Acquisitions

Brian S. R. Armstrong1, Todd P. Kusik1, Robert T. Barrows1, Brian Andrews-Shigaki2, Julian Maclaren3, Maxim Zaitsev3, Oliver Speck4, Thomas Prieto5, Thomas Ernst2

1Electrical Engineering, Univ. Wisc.-Milwaukee, Milwaukee, WI, United States; 2Medicine, University of Hawaii, Honolulu, HI, United States; 3Dept. of Diagnostic Radiology, University Hospital Freiburg, Freiburg, Germany; 4Biomedical Magnetic Resonance, Otto-von-Guericke University; 5Neurology, Medical College of Wisconsin, Wauwatosa, WI, United States

A retro-grate reflector (RGR) optical system for tracking motion in an MR bore is presented, including an RGR motion tracking camera comprising a camera, lighting system and custom drive electronics in an RF enclosure, and a rib that has been engineered to grip the inside surface of the MR bore and support a mirror, which permits viewing through a head coil opening with the RGR camera positioned outside the head end of the MR bore. Evaluations of RF interference, mirror stability and tracking system noise are presented.