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.