Influence of Mechanical Effect Due to MRI-magnet on Tattoo Seal and Eye Makeup

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  • Morishita Yuta
    School of Health Sciences, Faculty of Medicine, Kanazawa University (Currently, Department of Radiology, Kyoto-Katsura Hospital)
  • Miyati Tosiaki
    Division of Health Sciences, Graduate School of Medical Science, Kanazawa University
  • Ueda Jousei
    School of Health Sciences, Faculty of Medicine, Kanazawa University (Currently, Department of Radiology, Kyoto-Katsura Hospital)
  • Shimizu Mitsuru
    Department of Radiology, Kanazawa University Hospital
  • Hamaguchi Takashi
    Division of Health Sciences, Graduate School of Medical Science, Kanazawa University
  • Fujiwara Yasuhiro
    Department of Radiology, University of Fukui Hospital
  • Hayashi Hiroyuki
    Department of Radiology, University of Fukui Hospital

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  • ＭＲＩマグネットが刺青シールおよびアイメイクに及ぼす力学的作用の検討
  • MRI マグネット ガ イレズミ シール オヨビ アイ メイク ニ オヨボス リキガクテキ サヨウ ノ ケントウ

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The purpose of our study was to assess the mechanical effect on tattoo seals and eye makeup caused by a spatial magnetic gradient in the magnetic resonance imaging (MRI) system. Seven kinds of tattoo seals and three kinds of eye makeup, i.e., mascara, eye shadow, and eyeliner were used. On a 3.0-Tesla MRI, we determined these deflection angles according to a method established by the American Society for Testing and Materials (ASTM) at the position that produced the greatest magnetically induced deflection. Eighty-five percent of the tattoo seals showed deflection angles greater than 45 degrees of the ASTM guidelines, and the mascara and eye shadow showed over 40 degrees. This was because these contained ferromagnetic pigments such as an iron oxide, but those translational forces were very small owing to slight mass. However, it is desirable that these should be removed before MRI examination to prevent secondary problems. (Article in Japanese)

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