H. Kingma and H. Kromhout contributed equally.
MRI-related static magnetic stray fields and postural body sway: A double-blind randomized crossover study
Article first published online: 10 AUG 2012
Copyright © 2012 Wiley Periodicals, Inc.
Magnetic Resonance in Medicine
Volume 70, Issue 1, pages 232–240, July 2013
How to Cite
van Nierop, L. E., Slottje, P., Kingma, H. and Kromhout, H. (2013), MRI-related static magnetic stray fields and postural body sway: A double-blind randomized crossover study. Magn Reson Med, 70: 232–240. doi: 10.1002/mrm.24454
- Issue published online: 20 JUN 2013
- Article first published online: 10 AUG 2012
- Manuscript Accepted: 11 JUL 2012
- Manuscript Revised: 3 JUL 2012
- Manuscript Received: 6 APR 2012
- ZonMw (Electromagnetic Fields and Health Research, The Netherlands, “Symptoms, acute and chronic health effects of exposure to MRI-related electromagnetic fields and Epidemiology of health effects from EMF exposure). Grant Numbers: 85100001, 85800001
- static magnetic field;
- static magnetic stray field;
- time-varying magnetic field;
- vestibular organ
We assessed postural body sway performance after exposure to movement induced time-varying magnetic fields in the static magnetic stray field in front of a 7 Tesla (T) magnetic resonance imaging scanner. Using a double blind randomized crossover design, 30 healthy volunteers performed two balance tasks (i.e., standing with eyes closed and feet in parallel and then in tandem position) after standardized head movements in a sham, low exposure (on average 0.24 T static magnetic stray field and 0.49 T·s−1 time-varying magnetic field) and high exposure condition (0.37 T and 0.70 T·s−1). Personal exposure to static magnetic stray fields and time-varying magnetic fields was measured with a personal dosimeter. Postural body sway was expressed in sway path, area, and velocity. Mixed-effects model regression analysis showed that postural body sway in the parallel task was negatively affected (P < 0.05) by exposure on all three measures. The tandem task revealed the same trend, but did not reach statistical significance. Further studies are needed to investigate the possibility of independent or synergetic effects of static magnetic stray field and time-varying magnetic field exposure. In addition, practical safety implications of these findings, e.g., for surgeons and others working near magnetic resonance imaging scanners need to be investigated. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.