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. 2025 Aug;94(2):867-875.
doi: 10.1002/mrm.30513. Epub 2025 Mar 28.

Monitoring the head exposure of MRI workers around 3 T, 7 T, and 11.7 T scanners using smart goggles equipped with a network of magnetometers

Hugo Nicolas  1 , Corentin Féry  1 , Thomas Quirin  1 , Nicolas Weber  2 , Julien Oster  2 , Jacques Felblinger  2 , Alexandre Vignaud  3 , Joris Pascal  1
Affiliations

Monitoring the head exposure of MRI workers around 3 T, 7 T, and 11.7 T scanners using smart goggles equipped with a network of magnetometers

Hugo Nicolas et al. Magn Reson Med. 2025 Aug.

Abstract

Purpose: The aim of this paper is to introduce a new magnetic field exposimeter device that consists of goggles equipped with magnetic sensors for the assessment of the field exposure of MRI workers' heads. This is not possible with conventional pocket exposimeters. Hence, this device allows head-level field exposure to be measured, which can induce physiological effects on MRI workers, and which are required to be covered by managing the laboratory-related safety hazards directive 2013/35/EU.

Methods: Using on-chip monolithic three-axis Hall effect magnetometers, recently introduced on the market, we developed an exposimeter with unprecedented accuracy, which allows the measurement of the magnetic field closed to the organs which are the most impacted by strong magnetic fields: the brain, the eyes, and the tongue.

Results: The exposimeter prototypes were successfully tested around 3 T, 7 T, and 11.7 T MRI scanners on different workers and volunteers in real conditions. Comparisons with chest-level measurements lead typically to lower values than exposure recorded at the head-level, confirming the need for such head-level assessments. Exposure of the head above the limits established by the directive was also recorded (>2 T or >2.7 T/s).

Conclusion: This new exposimeter allows for a more accurate assessment of field exposure of MRI workers. Further improvements in the miniaturization and the usability of the exposimeter will allow us to disseminate the device and open the way to a larger-scale study.

Keywords: exposimeter; field exposure; magnetic sensor; safety.

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References

REFERENCES

    1. ICNIRP. Static Magnetic Fields (0 Hz). https://www.icnirp.org/en/frequencies/static‐magnetic‐fields‐0‐hz/index....
    1. ICNIRP. LF (1 Hz‐100 kHz). https://www.icnirp.org/en/frequencies/low‐frequency/index.html
    1. ICNIRP. Static Electric Fields (0 Hz). https://www.icnirp.org/en/frequencies/static‐electric‐fields‐0‐hz/index....
    1. Directive 2013/35/EU of the European Parliament and of the Council of 26 June 2013 on the Minimum Health and Safety Requirements Regarding the Exposure of Workers to the Risks Arising From Physical Agents (Electromagnetic Fields) (20th Individual Directive Within the Meaning of Article 16(1) of Directive 89/391/EEC) and Repealing Directive 2004/40/EC; 2013.
    1. Vocht F, Batistatou E, Mölter A, et al. Transient health symptoms of MRI staff working with 1.5 and 3.0 tesla scanners in the UK. Eur Radiol. 2015;25:2718‐2726.

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