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EMF exposure variation among MRI sequences from pediatric examination protocols
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.ORCID iD: 0000-0003-4084-6652
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.ORCID iD: 0000-0001-7260-6819
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
2019 (English)In: Bioelectromagnetics, ISSN 0197-8462, E-ISSN 1521-186X, Vol. 40, no 1, p. 3-15Article in journal (Refereed) Published
Abstract [en]

The magnetic resonance imaging (MRI) exposure environment is unique due to the mixture and intensity of magnetic fields involved. Current safety regulations are based on well-known acute effects of heating and neuroexcitation while the scientific grounds for possible long-term effects from MRI exposure are lacking. Epidemiological research requires careful exposure characterization, and as a first step toward improved exposure assessment we set out to characterize the MRI-patient exposure environment. Seven MRI sequences were run on a 3-Tesla scanner while the radiofrequency and gradient magnetic fields were measured inside the scanner bore. The sequences were compared in terms of 14 different exposure parameters. To study within-sequence variability, we varied sequence settings such as flip angle and slice thickness one at a time, to determine if they had any impact on exposure endpoints. There were significant differences between two or more sequences for all fourteen exposure parameters. Within-sequence differences were up to 60% of the corresponding between-sequence differences, and a 5-8 fold exposure increase was caused by variations in flip angle, slice spacing, and field of view. MRI exposure is therefore not only sequence-specific but also patient- and examination occurrence-specific, a complexity that requires careful consideration for an MRI exposure assessment in epidemiological studies to be meaningful. 

Place, publisher, year, edition, pages
Wiley-Blackwell, 2019. Vol. 40, no 1, p. 3-15
Keywords [en]
children, electromagnetic field, epidemiology, exposure assessment, radiofrequency
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:umu:diva-155086DOI: 10.1002/bem.22159ISI: 000453860500001PubMedID: 30500987OAI: oai:DiVA.org:umu-155086DiVA, id: diva2:1277562
Funder
Swedish Research Council, 521-2013-2702Available from: 2019-01-10 Created: 2019-01-10 Last updated: 2019-01-10Bibliographically approved

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Frankel, JenniferHansson Mild, KjellWilén, Jonna

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