Vertical open-bore MRI scanners generate significantly less radiofrequency heating around implanted leads: A study of deep brain stimulation implants in 1.2T OASIS scanners versus 1.5T horizontal systems

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buir.contributor.authorKazemivalipour, Ehsan
buir.contributor.authorAtalar, Ergin
buir.contributor.orcidKazemivalipour, Ehsan|0000-0003-4221-2397
buir.contributor.orcidAtalar, Ergin|0000-0002-6874-6103
dc.citation.epage1572en_US
dc.citation.issueNumber3en_US
dc.citation.spage1560en_US
dc.citation.volumeNumber86en_US
dc.contributor.authorKazemivalipour, Ehsan
dc.contributor.authorBhusal, B.
dc.contributor.authorVu, J.
dc.contributor.authorLin, S.
dc.contributor.authorNguyen, B. T.
dc.contributor.authorKirsch, J.
dc.contributor.authorNowac, E.
dc.contributor.authorPilitsis, J.
dc.contributor.authorRosenow, J.
dc.contributor.authorAtalar, Ergin
dc.contributor.authorGolestanirad, L.
dc.date.accessioned2022-03-01T07:13:17Z
dc.date.available2022-03-01T07:13:17Z
dc.date.issued2021-04-07
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.description.abstractPurpose Patients with active implants such as deep brain stimulation (DBS) devices are often denied access to MRI due to safety concerns associated with the radiofrequency (RF) heating of their electrodes. The majority of studies on RF heating of conductive implants have been performed in horizontal close-bore MRI scanners. Vertical MRI scanners which have a 90° rotated transmit coil generate fundamentally different electric and magnetic field distributions, yet very little is known about RF heating of implants in this class of scanners. We performed numerical simulations as well as phantom experiments to compare RF heating of DBS implants in a 1.2T vertical scanner (OASIS, Hitachi) compared to a 1.5T horizontal scanner (Aera, Siemens). Methods Simulations were performed on 90 lead models created from post-operative CT images of patients with DBS implants. Experiments were performed with wires and commercial DBS devices implanted in an anthropomorphic phantom. Results We found significant reduction of 0.1 g-averaged specific absorption rate (30-fold, P < 1 × 10−5) and RF heating (9-fold, P < .026) in the 1.2T vertical scanner compared to the 1.5T conventional scanner. Conclusion Vertical MRI scanners appear to generate lower RF heating around DBS leads, providing potentially heightened safety or the flexibility to use sequences with higher power levels than on conventional systems.en_US
dc.embargo.release2022-04-07
dc.identifier.doi10.1002/mrm.28818en_US
dc.identifier.eissn1522-2594
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/77633
dc.language.isoEnglishen_US
dc.publisherJohn Wiley & Sons, Inc.en_US
dc.relation.isversionofhttps://doi.org/10.1002/mrm.28818en_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subjectDeep brain stimulationen_US
dc.subjectFinite element methoden_US
dc.subjectMedical implantsen_US
dc.subjectMR- guided neurosurgeryen_US
dc.subjectMRI safetyen_US
dc.subjectOpen- bore vertical MRIen_US
dc.subjectRF heatingen_US
dc.titleVertical open-bore MRI scanners generate significantly less radiofrequency heating around implanted leads: A study of deep brain stimulation implants in 1.2T OASIS scanners versus 1.5T horizontal systemsen_US
dc.typeArticleen_US
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Department of Electrical and Electronics Engineering
National Magnetic Resonance Research Center (UMRAM)