Personal exposure to static and time-varying magnetic fields during MRI procedures in clinical practice in the UK

Batistatous, Evridiki, Mölter, Anna, Kromhout, Hans, van Tongeren, Martie, Crozier, Stuart, Schaap, Kristel, Gowland, Penny, Keevil, Stephen F. and de Vocht, Frank de (2015) Personal exposure to static and time-varying magnetic fields during MRI procedures in clinical practice in the UK. Occupational And Environmental Medicine, 73 11: 779-786. doi:10.1136/oemed-2015-103194

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Author Batistatous, Evridiki
Mölter, Anna
Kromhout, Hans
van Tongeren, Martie
Crozier, Stuart
Schaap, Kristel
Gowland, Penny
Keevil, Stephen F.
de Vocht, Frank de
Title Personal exposure to static and time-varying magnetic fields during MRI procedures in clinical practice in the UK
Journal name Occupational And Environmental Medicine   Check publisher's open access policy
ISSN 1351-0711
Publication date 2015-12-16
Year available 2015
Sub-type Article (original research)
DOI 10.1136/oemed-2015-103194
Open Access Status DOI
Volume 73
Issue 11
Start page 779
End page 786
Total pages 8
Place of publication London, United Kingdom
Publisher BMJ Group
Language eng
Formatted abstract
Background MRI has developed into one of the most important medical diagnostic imaging modalities, but it exposes staff to static magnetic fields (SMF) when present in the vicinity of the MR system, and to radiofrequency and switched gradient electromagnetic fields if they are present during image acquisition. We measured exposure to SMF and motion-induced time-varying magnetic fields (TVMF) in MRI staff in clinical practice in the UK to enable extensive assessment of personal exposure levels and variability, which enables comparison to other countries.

Methods 8 MRI facilities across National Health Service sites in England, Wales and Scotland were included, and staff randomly selected during the days when measurements were performed were invited to wear a personal MRI-compatible dosimeter and keep a diary to record all procedures and tasks performed during the measured shift.

Results 98 participants, primarily radiographers (71%) but also other healthcare staff, anaesthetists and other medical staff were included, resulting in 149 measurements. Average geometric mean peak SMF and TVMF exposures were 448 mT (range 20–2891) and 1083 mT/s (9–12 355 mT/s), and were highest for radiographers (GM=559 mT and GM=734 mT/s). Time-weighted exposures to SMF and TVMF (GM=16 mT (range 5–64) and GM=14 mT/s (range 9–105)) and exposed-time-weighted exposures to SMF and TVMF (GM=27 mT (range 11–89) and GM=17 mT/s (range 9–124)) were overall relative low—primarily because staff were not in the MRI suite for most of their shifts—and did not differ significantly between occupations.

Conclusions These results are comparable to the few data available from the UK but they differ from recent data collected in the Netherlands, indicating that UK staff are exposed for shorter periods but to higher levels. These data indicate that exposure to SMF and TVMF from MRI scanners cannot be extrapolated across countries.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Information Technology and Electrical Engineering Publications
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Created: Fri, 18 Dec 2015, 19:24:26 EST by Celia Mackle on behalf of School of Information Technol and Elec Engineering