New Phase-Based B-1 Mapping Method Using Two-Dimensional Spin-Echo Imaging with Hyperbolic Secant Pulses

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dc.contributor.authorLee, Yoo Jinko
dc.contributor.authorHan, Ye Jiko
dc.contributor.authorPark, Hyun-Wookko
dc.contributor.authorWatanabe, Hidehiroko
dc.contributor.authorGarwood, Michaelko
dc.contributor.authorPark, Jang-Yeonko
dc.date.accessioned2015-04-07T04:35:25Z-
dc.date.available2015-04-07T04:35:25Z-
dc.date.created2015-02-05-
dc.date.created2015-02-05-
dc.date.created2015-02-05-
dc.date.created2015-02-05-
dc.date.issued2015-01-
dc.identifier.citationMAGNETIC RESONANCE IN MEDICINE, v.73, no.1, pp.170 - 181-
dc.identifier.issn0740-3194-
dc.identifier.urihttp://hdl.handle.net/10203/195184-
dc.description.abstractPurposeTo propose a new phase-based B-1-mapping method that exploits phase information created by hyperbolic secant (HS) pulses in conventional 2D spin-echo imaging. MethodsIn this B-1-mapping method, HS pulses are used to accomplish /2 excitation and refocusing in standard multislice spin-echo imaging. When setting the ratio of pulse lengths of the /2 and HS pulses to 2:1, the spin-echo phase is independent of offset frequency and varies as a function of B-1 strength. To eliminate undesired phase accumulations induced by unknown factors other than the B-1 strength, two spin-echo images are acquired using HS pulses applied with opposite frequency-sweep directions, and the resulting phase images are subtracted from each other. To demonstrate the performance of the proposed method, phantom and in vivo experiments were performed using a surface coil and a volume coil. ResultsThe B-1 maps obtained by using the proposed method were in accordance with the B-1 maps obtained using previous methods in both phantom and in vivo experiments. ConclusionThe proposed method is easy to implement without any sequence modification, is insensitive to B-0 inhomogeneity and chemical shift, and is robust in a reasonably wide range of B-1 field strength. Magn Reson Med 73:170-181, 2015.-
dc.languageEnglish-
dc.publisherWILEY-BLACKWELL-
dc.titleNew Phase-Based B-1 Mapping Method Using Two-Dimensional Spin-Echo Imaging with Hyperbolic Secant Pulses-
dc.typeArticle-
dc.identifier.wosid000346908800016-
dc.identifier.scopusid2-s2.0-84919837141-
dc.type.rimsART-
dc.citation.volume73-
dc.citation.issue1-
dc.citation.beginningpage170-
dc.citation.endingpage181-
dc.citation.publicationnameMAGNETIC RESONANCE IN MEDICINE-
dc.identifier.doi10.1002/mrm.25110-
dc.contributor.localauthorPark, Hyun-Wook-
dc.contributor.nonIdAuthorWatanabe, Hidehiro-
dc.contributor.nonIdAuthorGarwood, Michael-
dc.contributor.nonIdAuthorPark, Jang-Yeon-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorB-1 mapping-
dc.subject.keywordAuthorflip-angle mapping-
dc.subject.keywordAuthorRF field mapping-
dc.subject.keywordAuthorspin-echo imaging-
dc.subject.keywordAuthorhyperbolic secant pulse-
dc.subject.keywordAuthorfrequency-modulation pulse-
dc.subject.keywordAuthorB-1 mapping-
dc.subject.keywordAuthorflip-angle mapping-
dc.subject.keywordAuthorRF field mapping-
dc.subject.keywordAuthorspin-echo imaging-
dc.subject.keywordAuthorhyperbolic secant pulse-
dc.subject.keywordAuthorfrequency-modulation pulse-
dc.subject.keywordPlusIN-VIVO-
dc.subject.keywordPlusRADIOFREQUENCY FIELD-
dc.subject.keywordPlusMAGNETIC-RESONANCE-
dc.subject.keywordPlus7 T-
dc.subject.keywordPlusNONUNIFORMITIES-
dc.subject.keywordPlusINVERSION-
dc.subject.keywordPlusSEQUENCE-
dc.subject.keywordPlusNMR-
dc.subject.keywordPlusMRI-
dc.subject.keywordPlusIN-VIVO-
dc.subject.keywordPlusRADIOFREQUENCY FIELD-
dc.subject.keywordPlusMAGNETIC-RESONANCE-
dc.subject.keywordPlus7 T-
dc.subject.keywordPlusNONUNIFORMITIES-
dc.subject.keywordPlusINVERSION-
dc.subject.keywordPlusSEQUENCE-
dc.subject.keywordPlusNMR-
dc.subject.keywordPlusMRI-
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