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Development and evaluation of a small and mobile Magneto Alert Sensor (MALSE) to support safety requirements for magnetic resonance imaging

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Item Type:Article
Title:Development and evaluation of a small and mobile Magneto Alert Sensor (MALSE) to support safety requirements for magnetic resonance imaging
Creators Name:Martin, C. and Frauenrath, T. and Oezerdem, C. and Renz, W. and Niendorf, T.
Abstract:OBJECTIVE: The purpose of this study is to (i) design a small and mobile Magnetic field ALert SEnsor (MALSE), (ii) to carefully evaluate its sensors to their consistency of activation/deactivation and sensitivity to magnetic fields, and (iii) to demonstrate the applicability of MALSE in 1.5 T, 3.0 T and 7.0 T MR fringe field environments. METHODS: MALSE comprises a set of reed sensors, which activate in response to their exposure to a magnetic field. The activation/deactivation of reed sensors was examined by moving them in/out of the fringe field generated by 7TMR. RESULTS: The consistency with which individual reed sensors would activate at the same field strength was found to be 100% for the setup used. All of the reed switches investigated required a substantial drop in ambient magnetic field strength before they deactivated. CONCLUSIONS: MALSE is a simple concept for alerting MRI staff to a ferromagnetic object being brought into fringe magnetic fields which exceeds MALSEs activation magnetic field. MALSE can easily be attached to ferromagnetic objects within the vicinity of a scanner, thus creating a barrier for hazardous situations induced by ferromagnetic parts which should not enter the vicinity of an MR-system to occur.
Keywords:MRI, MR Safety, Magneto Alert Sensor, High Field MRI, Ultrahigh Field MRI
Source:European Radiology
ISSN:0938-7994
Publisher:Springer (Germany)
Volume:21
Number:10
Page Range:2187-2192
Date:October 2011
Additional Information:The original publication is available at www.springerlink.com
Official Publication:https://doi.org/10.1007/s00330-011-2153-z
PubMed:View item in PubMed

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