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Abstract #3231

Trial of safe working procedure against occupational SMF exposure - evaluation of its effectiveness in occupational SMF exposure levels and work performances among 3 T MRI system users -

Sachiko Yamaguchi-Sekino 1 , Masaki Sekino 2 , and Toshiharu Nakai 3

1 National Institute of Occuaptional Safety and Health, Japan, Kawasaki, Kanagawa, Japan, 2 Graduate School of Engineering, The University of Tokyo, Tokyo, Japan, 3 Neuroimaging & Informatics, National Center for Geriatrics and Gerontology, Aichi, Japan

Occupational exposure to the static magnetic field (SMF) is an arising problem in operators of magnetic resonance imaging (MRI) system. Although the individual motion control is recommended for MR workers to prevent these temporal effects, more feasible safe working procedure is required to achieve the compliance monitoring. The present study set 30 cm of the approach restricted area from the end of 3 T MRI system instead of the individual motion control. The average of the maximum SMF exposure among subjects was decreased in 25 % by this action ( t -test, p <0.01). And motion analysis by motion capture indicated that work performances were not affected under this action. These results suggest that this simple safe working procedure is applicative for MR workers to reduce occupational SMF exposure without remarkable changes in work performances. And the quantification of MR workers motions by motion capture provides the useful information for electromagnetic field dosimetry.

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