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EMF exposure variat...
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Frankel, JenniferUmeå universitet,Radiofysik
(författare)
EMF exposure variation among MRI sequences from pediatric examination protocols
- Artikel/kapitelEngelska2019
Förlag, utgivningsår, omfång ...
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2018-11-30
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Wiley-Blackwell,2019
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:umu-155086
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-155086URI
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https://doi.org/10.1002/bem.22159DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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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.
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Hansson Mild, KjellUmeå universitet,Radiofysik(Swepub:umu)kjha0001
(författare)
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Olsrud, Johan
(författare)
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Wilén, JonnaUmeå universitet,Radiofysik(Swepub:umu)jowi0025
(författare)
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Umeå universitetRadiofysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Bioelectromagnetics: Wiley-Blackwell40:1, s. 3-150197-84621521-186X
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