Analytic expressions for the ultimate intrinsic signal-to-noise ratio and ultimate intrinsic specific absorption rate in MRI

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buir.contributor.authorAtalar, Ergin
dc.citation.epage858en_US
dc.citation.issueNumber3en_US
dc.citation.spage846en_US
dc.citation.volumeNumber66en_US
dc.contributor.authorKopanoglu, E.en_US
dc.contributor.authorErturk, V. B.en_US
dc.contributor.authorAtalar, Erginen_US
dc.date.accessioned2016-02-08T09:51:22Z
dc.date.available2016-02-08T09:51:22Z
dc.date.issued2011-03-09en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.description.abstractThe ultimate intrinsic signal-to-noise ratio is the highest possible signal-to-noise ratio, and the ultimate intrinsic specific absorption rate provides the lowest limit of the specific absorption rate for a given flip angle distribution. Analytic expressions for ultimate intrinsic signal-to-noise ratio and ultimate intrinsic specific absorption rate are obtained for arbitrary sample geometries. These expressions are valid when the distance between the point of interest and the sample surface is smaller than the wavelength, and the sample is homogeneous. The dependence on the sample permittivity, conductivity, temperature, size, and the static magnetic field strength is given in analytic form, which enables the easy evaluation of the change in signal-to-noise ratio and specific absorption rate when the sample is scaled in size or when any of its geometrical or electrical parameters is altered. Furthermore, it is shown that signal-to-noise ratio and specific absorption rate are independent of the permeability of the sample. As a practical case and a solution example, a uniform, circular cylindrically shaped sample is studied. Copyrighten_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TÜBİTAK)en_US
dc.description.sponsorshipTurkish Academy of Sciences (TUBA)-GEBIPen_US
dc.identifier.doi10.1002/mrm.22830en_US
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/21808
dc.language.isoEnglishen_US
dc.publisherWileyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1002/mrm.22830en_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subjectUltimate intrinsic SNRen_US
dc.subjectUltimate intrinsic SARen_US
dc.subjectQuasistaticen_US
dc.titleAnalytic expressions for the ultimate intrinsic signal-to-noise ratio and ultimate intrinsic specific absorption rate in MRIen_US
dc.typeArticleen_US
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Department of Electrical and Electronics Engineering
National Magnetic Resonance Research Center (UMRAM)