Julian Maclaren1, Florian Schneider2,
Michael Herbst1, Murat Aksoy3, Daniel Kopeinigg3,
Juergen Hennig1, Roland Bammer3, Maxim Zaitsev1,
Ulrike Wallrabe2
1Medical Physics, Dept. of
Radiology, University Medical Center Freiburg, Freiburg, Germany; 2Dept.
of Microsystems Engineering - IMTEK, University of Freiburg, Freiburg,
Germany; 3Dept. of Radiology, Stanford University, Stanford,
United States
MR-compatible camera systems are used for head tracking, eye tracking, and in interventional MRI. However, a limited depth of focus and small field of view provide a challenge for in-bore cameras, particular if the goal is to monitor a moving subject. In this work we present an MR-compatible adaptive lens and objective. Focusing on a checkerboard tracking target is demonstrated during simultaneous MR imaging. RF interference tests and field distortion measurements indicate excellent compatibility with the MR system.