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Abstract #4341

Quantitative evaluation of two marker fixation systems for prospective motion correction

Nicolas Adrien Pannetier 1,2 , Theano Stravinos 2 , Peter Ng 2 , Michael Herbst 3 , Maxim Zaitsev 3 , Gerald Matson 1,2 , and Norbert Schuff 1,2

1 Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States, 2 Centre for Imaging of Neurodegenerative Diseases, VA Medical Center, San Francisco, CA, United States, 3 Department of Radiology, University Medical Center Freiburg, Freiburg, Germany

Motion artifacts in MRI images can be reduced with prospective motion correction system. However, results are sensitive to the accuracy of the motion tracking system and finding a sensitive metric for quantifying the effectiveness of the correction has been elusive. We tested two different marker positions; either mounted on the nose bridge or mounted on a mouth guard, and proposed a quantitative approach to compare effectiveness of motion correction. We found that the mouth guard outperforms the nose bridge fixation for accurately tracking the head motion and produce motion-free images.

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