Assessment of exposure to MRI motion-induced fields based on the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines

Purpose The goal of this study was to conduct an exposure assessment for workers moving through the stray stationary field of common MRI scanners, performed according to the recent International Commission on Non‐Ionizing Radiation Protection (ICNIRP) Guidelines, which aim at avoiding annoying senso...

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Vydané v:	Magnetic resonance in medicine Ročník 76; číslo 4; s. 1291 - 1300
Hlavní autori:	Zilberti, Luca, Bottauscio, Oriano, Chiampi, Mario
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	United States Blackwell Publishing Ltd 01.10.2016 Wiley Subscription Services, Inc
Predmet:	Adult Humans Internationality Magnetic Fields Magnetic Resonance Imaging - standards Male Motion motion-induced electric field Occupational Exposure - analysis Practice Guidelines as Topic Radiation Dosage Radiation Exposure - adverse effects Radiation Exposure - prevention & control Radiation Injuries - prevention & control Radiation Monitoring - standards Radiation Protection - standards Safety Management - standards static magnetic field workers' safety motion-induced electric field workers’ safety static magnetic field
ISSN:	0740-3194, 1522-2594
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Shrnutí:	Purpose The goal of this study was to conduct an exposure assessment for workers moving through the stray stationary field of common MRI scanners, performed according to the recent International Commission on Non‐Ionizing Radiation Protection (ICNIRP) Guidelines, which aim at avoiding annoying sensory effects. Theory and Methods The analysis was performed through numerical simulations, using a high‐resolution anatomical model that moved along realistic trajectories in proximity to a tubular and open MRI scanner. Both dosimetric indexes indicated by ICNIRP (maximum variation of the magnetic flux density vector and exposure index for the motion‐induced electric field) were computed for three statures of the human model. Results A total of 51 exposure situations were analyzed. None of them exceeded the limit for the maximum variation of the magnetic flux density, whereas some critical cases were found when computing the induced electric field. In the latter case, the exposure indexes computed via Fourier transform and through an equivalent filter result to be consistent. Conclusion The results suggest the adoption of some simple precautionary rules, useful when sensory effects experienced by an operator could reflect upon the patient's safety. Moreover, some open issues regarding the quantification of motion‐induced fields are highlighted, putting in evidence the need for clarification at standardization level. Magn Reson Med 76:1291–1300, 2016. © 2015 Wiley Periodicals, Inc.
Bibliografia:	ArticleID:MRM26031 istex:E30E1FA476F9D03D50E8C0CEA571963143546292 ark:/67375/WNG-M8WMX57P-K European Metrology Research Programme (EMRP)-HLT06 Joint Research Project "Metrology for Next-Generation Safety Standards and Equipment in MRI" (2012-2015). EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0740-3194 1522-2594
DOI:	10.1002/mrm.26031