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

Michael C. Steckner; David Grainger; Geoff Charles-Edwards

doi:10.1002/mrm.30153

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

Michael C. Steckner, David Grainger, Geoff Charles-Edwards^*

^*Corresponding author for this work

Biomedical Engineering Department

Research output: Contribution to journal › Review article › peer-review

1 Citation (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	2237-2245
Number of pages	9
Journal	Magnetic Resonance in Medicine
Volume	92
Issue number	5
DOIs	https://doi.org/10.1002/mrm.30153
Publication status	Published - Nov 2024

Keywords

5 gauss (0.5 mT)
9 gauss (0.9 mT)
active implantable medical device (AIMD)
cardiac implantable electronic device (CIED)
magnet mode
MR safety
pacemakers

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10.1002/mrm.30153

Cite this

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

abstract = "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.",

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author = "Steckner, {Michael C.} and David Grainger and Geoff Charles-Edwards",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors. Magnetic Resonance in Medicine published by Wiley Periodicals LLC on behalf of International Society for Magnetic Resonance in Medicine.",

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doi = "10.1002/mrm.30153",

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

Abstract

Keywords

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