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Ann Work Expo Health. 2019 Mar 29;63(3):328-336. doi: 10.1093/annweh/wxz002.

The Procedure for Quantitative Characterization and Analysis of Magnetic Fields in Magnetic Resonance Sites for Protection of Workers: A Pilot Study.

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Institute of Clinical Physiology, CNR, Via G. Moruzzi 1, San Cataldo, Pisa, Italy.
Associazione Italiana Tecnici dell'Imaging in Risonanza Magnetica, AITIRM, Via XX Settembre 76, Firenze, Italy.
Fondazione CNR-Regione Toscana ''G. Monasterio'', Via G. Moruzzi 1, San Cataldo, Pisa, Italy.
Ambulatori Della Misericordia Srl Impresa Sociale, Via Montalvo 8, Campi Bisenzio (FI), Italy.
West Systems srl, Viale Donato Giannotti 24, Firenze, Italy.
Department of Information Engineering, University of Pisa, Via G. Caruso 16, Pisa, Italy.


Concerning the occupational exposure in magnetic resonance imaging (MRI) facilities, the worker behavior in the magnetic resonance (MR) room is of such particular importance that there is the need for a simple but reliable method to alert the worker of the highest magnetic field exposure. Here, we describe a quantitative analysis of occupational exposure in different MRI working environments: in particular, we present a field measurement method integrated with a software tool for an accurate mapping of the fringe field in the proximity of the magnetic resonance bore. Three illustrative assessment studies are finally presented, compared and discussed, considering an example of a realistic path followed by an MRI worker during the daily procedure. The results show that the basic restrictions set by ICNIRP can be exceeded during standard procedure even in 1.5 T scanners. Using the described simplified metrics, it is possible to introduce behavioral rules on how to move around an MRI room that could be more useful than a numerical limit to aid magnetic field risk mitigation strategies.


electromagnetic fields; exposure assessment; magnetic resonance; magnetic resonance imaging; occupational exposure


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