Sensory perceptions of individuals exposed to the static field of a 7T MRI: A controlled blinded study. Issue 6 (19th September 2014)

• Record Type: Journal Article
• Authors: Friebe, Björn; Wollrab, Astrid; Thormann, Markus; Fischbach, Katharina; Ricke, Jens; Grueschow, Marcus; Kropf, Siegfried; Fischbach, Frank; Speck, Oliver
• Is Part Of: Journal of magnetic resonance imaging. Volume 41:Issue 6(2015)
• Page Start: 1675
• Page End: 1681
• Publication Date: 2014-09-19
• Subjects: Magnetic resonance imaging -- Periodicals; 616
• DOI: 10.1002/jmri.24748
• Languages: English
• ISSNs: 1053-1807

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="jmri24748-sec-0001" sec-type="section"> <title>Purpose</title> <p>To determine the subjective experience of subjects undergoing 7T magnetic resonance imaging (MRI) compared to a mock scanner with no magnetic field.</p> </sec> <sec id="jmri24748-sec-0002" sec-type="section"> <title>Methods and Materials</title> <p>In all, 44 healthy subjects were exposed to both the <italic>B</italic><sub>0</sub> field of a 7T whole‐body MRI and a realistic mock scanner with no magnetic field. Subjects were blinded to the actual field strength and no scanning was performed. After exposure, subjects rated their experience of potential sensory perceptions.</p> </sec> <sec id="jmri24748-sec-0003" sec-type="section"> <title>Results</title> <p>The most frequently observed side effect was vertigo while entering the gantry, which was reported by 38.6% (<italic>n</italic> = 17). Other frequent side effects were the appearance of phosphenes (18.2%, <italic>n</italic> = 8), thermal heat sensation (15.9%), unsteady gait after exposure (13.6%, <italic>n</italic> = 6), and dizziness (13.6%). All side effects were reported significantly more often after 7T exposure. Nine subjects (20.5%) did not report any sensory perceptions at all, ie, neither in the 7T scanner nor in the mock scanner.</p> </sec> <sec id="jmri24748-sec-0004" sec-type="section"> <title>Conclusion</title> <p>Light, acute, and transient sensory perceptions can occur in subjects undergoing ultrahighfield MRI, of which vertigo seems to be the most frequently reported. Possible psychological effects might contribute to the emergence of such sensory perceptions, as some subjects also reported them to appear in a realistic mock scanner with no magnetic field. <bold>J. Magn. Reson. Imaging 2015;41:1675–1681.</bold> © <bold>2014 Wiley Periodicals, Inc.</bold></p> </sec> </abstract>