Improving radiofrequency power and specific absorption rate management with bumped transmit elements in ultra-high field MRI

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buir.contributor.authorSadeghi-Tarakameh, Alireza
buir.contributor.authorAtalar, Ergin
dc.citation.epage3493en_US
dc.citation.issueNumber6en_US
dc.citation.spage3485en_US
dc.citation.volumeNumber84en_US
dc.contributor.authorSadeghi-Tarakameh, Alireza
dc.contributor.authorAdriany, G.
dc.contributor.authorMetzger, G. J.
dc.contributor.authorLagore, R. L.
dc.contributor.authorJungst, S.
dc.contributor.authorDelaBarre, L.
dc.contributor.authorVan de Moortele, P. F.
dc.contributor.authorUğurbil, K.
dc.contributor.authorAtalar, Ergin
dc.contributor.authorEryaman, Y.
dc.date.accessioned2021-03-05T11:17:41Z
dc.date.available2021-03-05T11:17:41Z
dc.date.issued2020
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.description.abstractPurpose: In this study, we investigate a strategy to reduce the local specific absorption rate (SAR) while keeping constant inside the region of interest (ROI) at the ultra‐high field (B0 ≥ 7T) MRI. Methods: Locally raising the resonance structure under the discontinuity (i.e., creating a bump) increases the distance between the accumulated charges and the tissue. As a result, it reduces the electric field and local SAR generated by these charges inside the tissue. The at a point that is sufficiently far from the coil, however, is not affected by this modification. In this study, three different resonant elements (i.e., loop coil, snake antenna, and fractionated dipole [FD]) are investigated. For experimental validation, a bumped FD is further investigated at 10.5T. After the validation, the transmit performances of eight‐channel arrays of each element are compared through electromagnetic (EM) simulations. Results: Introducing a bump reduced the peak 10g‐averaged SAR by 21, 26, 23% for the loop and snake antenna at 7T, and FD at 10.5T, respectively. In addition, eight‐channel bumped FD array at 10.5T had a 27% lower peak 10g‐averaged SAR in a realistic human body simulation (i.e., prostate imaging) compared to an eight‐channel FD array. Conclusion: In this study, we investigated a simple design strategy based on adding bumps to a resonant element to reduce the local SAR while maintaining inside an ROI. As an example, we modified an FD and performed EM simulations and phantom experiments with a 10.5T scanner. Results show that the peak 10g‐averaged SAR can be reduced more than 25%.en_US
dc.embargo.release2021-12-01
dc.identifier.doi10.1002/mrm.28382en_US
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/75834
dc.language.isoEnglishen_US
dc.publisherWileyen_US
dc.relation.isversionofhttps://dx.doi.org/10.1002/mrm.28382en_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subject10.5 Teslaen_US
dc.subjectBumped transmitteren_US
dc.subjectMRIen_US
dc.subjectRadiofrequency safetyen_US
dc.subjectUltra-high fielden_US
dc.titleImproving radiofrequency power and specific absorption rate management with bumped transmit elements in ultra-high field MRIen_US
dc.typeArticleen_US

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