Transitioning from 0.5 to 0.9 mT: Protecting against inadvertent activation of magnet mode in active implants

The “5 gauss line” is a phrase that is likely to be familiar to everyone working with MRI, but what is its significance, how was it defined, and what changes are currently in progress? This review explores the history of 5 gauss (0.5 mT) as a threshold for protecting against inadvertently putting ca...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2024-11, Vol.92 (5), p.2237-2245
Main Authors: Steckner, Michael C., Grainger, David, Charles‐Edwards, Geoff
Format: Article
Language:English
Subjects:
5 gauss (0.5 mT)
9 gauss (0.9 mT)
active implantable medical device (AIMD)
cardiac implantable electronic device (CIED)
Defibrillators, Implantable
Electromagnetic Fields
Equipment Safety
Humans
magnet mode
Magnetic Resonance Imaging
Magnets
MR safety
Pacemaker, Artificial
pacemakers
Prostheses and Implants
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Summary:The “5 gauss line” is a phrase that is likely to be familiar to everyone working with MRI, but what is its significance, how was it defined, and what changes are currently in progress? This review explores the history of 5 gauss (0.5 mT) as a threshold for protecting against inadvertently putting cardiac pacemakers, implantable cardioverter defibrillators, and other active implantable medical devices into a “magnet mode.” Additionally, it describes the background to the recent change of this threshold to 9 gauss (0.9 mT) in the International Standard IEC 60601‐2‐33 edition 4.0 that defines basic safety requirements for MRI. Practical implications of this change and some ongoing and emerging issues are also discussed.
ISSN:0740-3194
1522-2594
1522-2594
DOI:10.1002/mrm.30153