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dc.contributor.authorKopanoglu, E.en_US
dc.contributor.authorYilmaz, U.en_US
dc.contributor.authorGokhalk, Y.en_US
dc.contributor.authorAtalar, E.en_US
dc.date.accessioned2016-02-08T09:36:47Z
dc.date.available2016-02-08T09:36:47Z
dc.date.issued2013en_US
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/20864
dc.description.abstractThe specific absorption rate is used as one of the main safety parameters in magnetic resonance imaging. The performance of imaging sequences is frequently hampered by the limitations imposed on the specific absorption rate that increase in severity at higher field strengths. The most well-known approach to reducing the specific absorption rate is presumably the variable rate selective excitation technique, which modifies the gradient waveforms in time. In this article, an alternative approach is introduced that uses gradient fields with nonlinear variations in space to reduce the specific absorption rate. The effect of such gradient fields on the relationship between the desired excitation profile and the corresponding radiofrequency pulse is shown. The feasibility of the method is demonstrated using three examples of radiofrequency pulse design. Finally, the proposed method is compared with and combined with the variable rate selective excitation technique. © 2012 Wiley Periodicals, Inc.en_US
dc.language.isoEnglishen_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.relation.isversionofhttp://dx.doi.org/10.1002/mrm.24478en_US
dc.subjectHigh order gradient fieldsen_US
dc.subjectMagnetic resonance imagingen_US
dc.subjectNonlinear gradient fieldsen_US
dc.subjectSpecific absorption rateen_US
dc.subjectNuclear magnetic resonance imagingen_US
dc.subjectRadiation absorptionen_US
dc.subjectRadiofrequencyen_US
dc.titleSpecific absorption rate reduction using nonlinear gradient fieldsen_US
dc.typeArticleen_US
dc.departmentNational Magnetic Resonance Research Centeren_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.citation.spage537en_US
dc.citation.epage546en_US
dc.citation.volumeNumber70en_US
dc.citation.issueNumber2en_US
dc.identifier.doi10.1002/mrm.24478en_US
dc.publisherWileyen_US


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