DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Yoo Jin | ko |
dc.contributor.author | Han, Ye Ji | ko |
dc.contributor.author | Park, Hyun-Wook | ko |
dc.contributor.author | Watanabe, Hidehiro | ko |
dc.contributor.author | Garwood, Michael | ko |
dc.contributor.author | Park, Jang-Yeon | ko |
dc.date.accessioned | 2015-04-07T04:35:25Z | - |
dc.date.available | 2015-04-07T04:35:25Z | - |
dc.date.created | 2015-02-05 | - |
dc.date.created | 2015-02-05 | - |
dc.date.created | 2015-02-05 | - |
dc.date.created | 2015-02-05 | - |
dc.date.issued | 2015-01 | - |
dc.identifier.citation | MAGNETIC RESONANCE IN MEDICINE, v.73, no.1, pp.170 - 181 | - |
dc.identifier.issn | 0740-3194 | - |
dc.identifier.uri | http://hdl.handle.net/10203/195184 | - |
dc.description.abstract | PurposeTo 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.language | English | - |
dc.publisher | WILEY-BLACKWELL | - |
dc.title | New Phase-Based B-1 Mapping Method Using Two-Dimensional Spin-Echo Imaging with Hyperbolic Secant Pulses | - |
dc.type | Article | - |
dc.identifier.wosid | 000346908800016 | - |
dc.identifier.scopusid | 2-s2.0-84919837141 | - |
dc.type.rims | ART | - |
dc.citation.volume | 73 | - |
dc.citation.issue | 1 | - |
dc.citation.beginningpage | 170 | - |
dc.citation.endingpage | 181 | - |
dc.citation.publicationname | MAGNETIC RESONANCE IN MEDICINE | - |
dc.identifier.doi | 10.1002/mrm.25110 | - |
dc.contributor.localauthor | Park, Hyun-Wook | - |
dc.contributor.nonIdAuthor | Watanabe, Hidehiro | - |
dc.contributor.nonIdAuthor | Garwood, Michael | - |
dc.contributor.nonIdAuthor | Park, Jang-Yeon | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | B-1 mapping | - |
dc.subject.keywordAuthor | flip-angle mapping | - |
dc.subject.keywordAuthor | RF field mapping | - |
dc.subject.keywordAuthor | spin-echo imaging | - |
dc.subject.keywordAuthor | hyperbolic secant pulse | - |
dc.subject.keywordAuthor | frequency-modulation pulse | - |
dc.subject.keywordAuthor | B-1 mapping | - |
dc.subject.keywordAuthor | flip-angle mapping | - |
dc.subject.keywordAuthor | RF field mapping | - |
dc.subject.keywordAuthor | spin-echo imaging | - |
dc.subject.keywordAuthor | hyperbolic secant pulse | - |
dc.subject.keywordAuthor | frequency-modulation pulse | - |
dc.subject.keywordPlus | IN-VIVO | - |
dc.subject.keywordPlus | RADIOFREQUENCY FIELD | - |
dc.subject.keywordPlus | MAGNETIC-RESONANCE | - |
dc.subject.keywordPlus | 7 T | - |
dc.subject.keywordPlus | NONUNIFORMITIES | - |
dc.subject.keywordPlus | INVERSION | - |
dc.subject.keywordPlus | SEQUENCE | - |
dc.subject.keywordPlus | NMR | - |
dc.subject.keywordPlus | MRI | - |
dc.subject.keywordPlus | IN-VIVO | - |
dc.subject.keywordPlus | RADIOFREQUENCY FIELD | - |
dc.subject.keywordPlus | MAGNETIC-RESONANCE | - |
dc.subject.keywordPlus | 7 T | - |
dc.subject.keywordPlus | NONUNIFORMITIES | - |
dc.subject.keywordPlus | INVERSION | - |
dc.subject.keywordPlus | SEQUENCE | - |
dc.subject.keywordPlus | NMR | - |
dc.subject.keywordPlus | MRI | - |
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