Approximate fourier domain expression for bloch-siegert shift

Simple item page
buir.contributor.authorAtalar, Ergin
dc.citation.epage125en_US
dc.citation.issueNumber1en_US
dc.citation.spage117en_US
dc.citation.volumeNumber73en_US
dc.contributor.authorTurk, E. A.en_US
dc.contributor.authorIder, Y. Z.en_US
dc.contributor.authorErgun, A. S.en_US
dc.contributor.authorAtalar, Erginen_US
dc.date.accessioned2016-02-08T10:24:09Z
dc.date.available2016-02-08T10:24:09Z
dc.date.issued2015en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.description.abstractPurpose: In this study, a newsimple Fourier domain-based analytical expression for the Bloch-Siegert (BS) shift-based B1 mapping method is proposed to obtain |B1+| more accurately while using short BS pulse durations and small off-resonance frequencies.Theory and Methods: A new simple analytical expression for the BS shift is derived by simplifying the Bloch equations. In this expression, the phase is calculated in terms of the Fourier transform of the radiofrequency pulse envelope, and thus making the off- and on-resonance effects more easily understandable. To verify the accuracy of the proposed expression, Bloch simulations and MR experiments are performed for the hard, Fermi, and Shinner-Le Roux pulse shapes.Results: Analyses of the BS phase shift-based B1 mapping method in terms of radiofrequency pulse shape, pulse duration, and off-resonance frequency show that |B1+| can be obtained more accurately with the aid of this new expression.Conclusions: In this study, a new simple frequency domain analytical expression is proposed for the BS shift. Using this expression, |B1+| values can be predicted from the phase data using the frequency spectrum of the radiofrequency pulse. This method works well even for short pulse durations and small offset frequencies.en_US
dc.identifier.doi10.1002/mrm.25104en_US
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/24103
dc.language.isoEnglishen_US
dc.publisherJohn Wiley and Sons Inc.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1002/mrm.25104en_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subjectB1 mappingen_US
dc.subjectMagnetic resonance imagingen_US
dc.subjectArticleen_US
dc.subjectBloch siegert shiften_US
dc.subjectFourier analysisen_US
dc.subjectFourier transformationen_US
dc.subjectGene expressionen_US
dc.subjectImage analysisen_US
dc.subjectNuclear magnetic resonance imagingen_US
dc.subjectRadiofrequencyen_US
dc.subjectSimulationen_US
dc.subjectTheoryen_US
dc.titleApproximate fourier domain expression for bloch-siegert shiften_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Approximate Fourier domain expression for Bloch-Siegert shift.pdf
Size:
587.48 KB
Format:
Adobe Portable Document Format
Description:
Full printable version
Download

Collections

Department of Electrical and Electronics Engineering
National Magnetic Resonance Research Center (UMRAM)