Vestibular effects of a 7 Tesla MRI examination compared to 1.5 T and 0 T in healthy volunteers

  • Ultra-high-field MRI (7 Tesla (T) and above) elicits more temporary side-effects compared to 1.5 T and 3 T, e.g. dizziness or “postural instability” even after exiting the scanner. The current study aims to assess quantitatively vestibular performance before and after exposure to different MRI scenarios at 7 T, 1.5 T and 0 T. Sway path and body axis rotation (Unterberger's stepping test) were quantitatively recorded in a total of 46 volunteers before, 2 minutes after, and 15 minutes after different exposure scenarios: 7 T head MRI (n = 27), 7 T no RF (n = 22), 7 T only B₀ (n = 20), 7 T in & out B₀ (n = 20), 1.5 T no RF (n = 20), 0 T (n = 15). All exposure scenarios lasted 30 minutes except for brief one minute exposure in 7 T in & out B₀. Both measures were documented utilizing a 3D ultrasound system. During sway path evaluation, the experiment was repeated with eyes both open and closed. Sway paths for all long-lasting 7 T scenarios (normal, no RF, only B₀) with eyes closed were significantly prolonged 2 minutes after exiting the scanner, normalizing after 15 minutes. Brief exposure to 7 T B₀ or 30 minutes exposure to 1.5 T or 0 T did not show significant changes. End positions after Unterberger's stepping test were significantly changed counter-clockwise after all 7 T scenarios, including the brief in & out B₀ exposure. Shorter exposure resulted in a smaller alteration angle. In contrast to sway path, reversal of changes in body axis rotation was incomplete after 15 minutes. 1.5 T caused no rotational changes. The results show that exposure to the 7 Tesla static magnetic field causes only a temporary dysfunction or “over-compensation” of the vestibular system not measurable at 1.5 or 0 Tesla. Radiofrequency fields, gradient switching, and orthostatic dysregulation do not seem to play a role.

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Metadaten
Author:Jens M. Theysohn, Oliver Kraff, Kristina Eilers, Dorian Andrade, Marcus Gerwig, Dagmar Timmann, Franz Schmitt, Mark E. Ladd, Susanne C. Ladd, Andreas Bitz
DOI:https://doi.org/10.1371/journal.pone.0092104
ISSN:1932-6203
Parent Title (English):PLoS one
Publisher:PLOS
Place of publication:San Francisco
Document Type:Article
Language:English
Year of Completion:2014
Volume:9
Issue:3
Length:e92104
Link:https://doi.org/10.1371/journal.pone.0092104
Zugriffsart:weltweit
Institutes:FH Aachen / Fachbereich Elektrotechnik und Informationstechnik
open_access (DINI-Set):open_access
collections:Verlag / PLOS
Open Access / Gold
Licence (German): Creative Commons - Namensnennung