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Simultaneous EEG and fMRI: T1-based evaluation of heating in a gel phantom at 3 Tesla

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Aaltonen (nee Tarnanen), Iina E.
dc.contributor.author Sepponen, Raimo E.
dc.contributor.author Jousmäki, Veikko T.
dc.date.accessioned 2013-02-07T09:30:05Z
dc.date.available 2013-02-07T09:30:05Z
dc.date.issued 2012
dc.identifier.isbn 978-952-60-4959-5 (electronic)
dc.identifier.issn 1799-490X (electronic)
dc.identifier.issn 1799-4896 (printed)
dc.identifier.issn 1799-4896 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/7722
dc.description.abstract EEG electrodes and leads, comparable to metallic implants, can lead to heating of tissue when used in an MRI scanner. Simultaneous EEG and fMRI experiments are frequently carried out at 3 T or higher fields. High field strength, and thus high-energy RF pulses, added to complex EEG lead configuration increases the risk of severe localized heating, or hot spots. Unlike the skin, the brain lacks thermoreceptors, and the subject might not report anything unusual during the scan although hot spots may occur. In simultaneous EEG and fMRI experiments, the temperature at individual electrode sites can be monitored using optic fibre temperature probes. To complement the isolated surface temperature readings, we aimed to map the whole temperature distribution within a phantom. An EEG-equipped gel phantom was imaged using a T1-weighted sequence before and after running a high-energy MR sequence at 3 T. Changes in T1 intensity profile would indicate a relative temperature increase. In our setting, hot spots were not detected in the relative temperature maps of the phantom. Optic fibre temperature probes at selected electrode sites indicated small temperature increases depending on the MR sequence used. The phantom core temperature remained unchanged. RF energy distribution can vary with electrode configurations and MRI scanners. We suggest that EEG equipments should be tested for safety reasons. The MRI thermometry –inspired relative T1 intensity method provides an easy way to test possible heating within a phantom. en
dc.format.extent 17
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series SCIENCE + TECHNOLOGY en
dc.relation.ispartofseries 22/2012
dc.subject.other Medical sciences en
dc.subject.other Physics en
dc.title Simultaneous EEG and fMRI: T1-based evaluation of heating in a gel phantom at 3 Tesla en
dc.type D4 Julkaistu kehittämis- tai tutkimusraportti tai -selvitys fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.contributor.department Elektroniikan laitos fi
dc.contributor.department Department of Electronics en
dc.subject.keyword 3T en
dc.subject.keyword functional magnetic resonance imaging en
dc.subject.keyword electroencephalography en
dc.subject.keyword heating en
dc.subject.keyword fMRI en
dc.subject.keyword T1-intensity method en
dc.subject.keyword EEG systems en
dc.subject.keyword safety evaluation en
dc.subject.keyword phantoms en
dc.identifier.urn URN:ISBN:978-952-60-4959-5
dc.type.dcmitype text en
dc.contributor.lab Department of Electronics & OV Lounasmaa Laboratory & Advanced Magnetic Imaging Centre en


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