A Survey Analysis of Acoustic Trauma Related to MR Scans

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  • NAKAI Toshiharu
    Neuroinformatics & Imaging, National Center for Geriatrics and Gerontology MR Safety Committee, Japanese Society for Magnetic Resonance in Medicine
  • KAMIYA Naoki
    Neuroinformatics & Imaging, National Center for Geriatrics and Gerontology
  • SONE Michihiko
    Department of Otorhinolaryngology, Nagoya University Graduate School of Medicine
  • MURANAKA Hiroyuki
    Department of Radiology, Hiroshima City General Rehabilitation Center MR Safety Committee, Japanese Society for Magnetic Resonance in Medicine
  • TSUCHIHASHI Toshio
    Department of Radiology, Nippon Medical School Hospital MR Safety Committee, Japanese Society for Magnetic Resonance in Medicine
  • YAMADA Naoki
    Department of Radiology, National Cerebral and Cardiovascular Center MR Safety Committee, Japanese Society for Magnetic Resonance in Medicine
  • YAMAGUCHI Sachiko
    MR Safety Committee, Japanese Society for Magnetic Resonance in Medicine Division of Health Effects Research, National Institute of Occupational Safety and Health

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Purpose: The maximum limit of MR scanner noise and necessity of ear protection is defined in the IEC standard (IEC60601-2-33) of MR safety. With improvements in MR scanner performance, pulse sequences generating higher scanning noise have been used clinically. In this study, we investigated the factors significantly related to potential acoustic trauma cases (PATC) after MR examinations. To consider the future direction for MR safety and prevention of acoustic trauma, issues related to noise generation by MR scanners and acoustic trauma were systematically reviewed.<br> Methods: A statistical analysis was performed using the data set from a survey (n=974) conducted in 2010 by the JSMRM safety committee. Hierarchical clustering analysis was used to extract the characteristics of the responders. With this classification as a reference, tests of independence and a residual analysis were employed to evaluate the factors related to PATC.<br> Results: No significant relationship was observed between the ear protection policy and the incidence or the reported outcome of PATC. While the two main clusters out of the six clusters extracted were associated with who reported the PATC and the confirmation process of the acoustic noise level of MR scanners, no cluster was associated with the frequency of PATC. An absence of PATC was significantly less reported (p=0.03) and more PATC was reported (p=0.04) by facilities with 3T MR systems.<br> Discussion: Although the total frequency was 4 cases, it should be noted that persistent hearing disturbances are a possible consequence of MR examinations. Neither the condition of the subjects nor the ear protection method was significantly related to the probability of PATC, suggesting the difficulty of predicting the potential risk of acoustic trauma. It is recommended to more systematically follow up PATC cases and clarify the risk factors.<br>

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