Assessment of marker fixation in prospective motion correction using a multiple marker approach.
Benjamin Knowles 1 , Thomas Lange 1 , Aditya Singh 2 , Michael Herbst 2 , and Maxim Zaitsev 1
Medical Physics, Univeristy Medical Centre
Freiburg, Freiburg, Germany,
A Burns School of Medicine, University of Hawaii,
Honolulu, Hawaii, United States
For accurate prospective motion correction using
markers, the marker must be rigidly coupled to the
motion of the imaged object. However, patient comfort
and ease of adhesion are important factors, especially
in a clinical setting. In this study, dual-marker
tracking is used to assess drifts and non-coupled motion
of markers adhered to the forehead or nose. This is
achieved by tracking the relative pose of the marker
compared to a reference marker fixated to a mouthpiece,
assumed perfectly coupled to the skull. Drifts were
measured to be small, but squinting causes large
decoupling of marker motion with the skull.
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