F. Schneider, J. Draheim, T. Burger, J. Maclaren, M. Herbst, M. Zaitsev, R. Bammer, U. Wallrabe
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An adaptive objective for optical motion correction in MRI
We present an adaptive membrane lens that is compatible with a magnetic resonance (MR) imaging system, as a part of an objective for in-bore optical motion tracking and correction. Compatibility tests with the high magnetic fields of a 3 T scanner and the shielding of the adaptive lens are discussed. For tracking of a marker an adaptive wide-angle objective has been designed and characterised. The measured mean distortions of the objective are between −2.05 and −2.6 %. The tracking system was verified in a MR scanner model.
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