DC Field | Value | Language |
---|---|---|
dc.contributor.author | Chung, JY | ko |
dc.contributor.author | Yoon, HW | ko |
dc.contributor.author | Kim, YB | ko |
dc.contributor.author | Park, HyunWook | ko |
dc.contributor.author | Cho, ZH | ko |
dc.date.accessioned | 2009-06-29T06:37:01Z | - |
dc.date.available | 2009-06-29T06:37:01Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2009-01 | - |
dc.identifier.citation | JOURNAL OF MAGNETIC RESONANCE IMAGING, v.29, pp.221 - 228 | - |
dc.identifier.issn | 1053-1807 | - |
dc.identifier.uri | http://hdl.handle.net/10203/9836 | - |
dc.description.abstract | Purpose: To implement a method using a tailored radiofrequency (TRF) pulse with a quadratic phase profile to recover susceptibility-induced signal losses in gradient-recalled echo-planar images (EPI). Materials and Methods: A functional magnetic resonance imaging (fMRI) experiment for compensation of susceptibility artifacts. known as the TRIF pulse EPI sequence (TRF-EPI), was used. TRF pulse compensates the susceptibility effect with a reduced signal-to-noise ratio (SNR) to one-half when the maximum phase distribution is 2 pi. We demonstrate theoretically that the maximum phase distribution can also be reduced to 7 rather than 2 pi. improving the SNR accordingly. An analysis was conducted comparing this newly proposed strategy using a standard RF excitation with a linear phase distribution and a quadratic TRF excitation with a pi phase distribution. Results: Thorough experimental comparisons were also made between the TRF quadratic excitation with a pi phase profile and conventional EPI with a standard excitation in human subjects during ventral brain activation. Conclusion: With reduced maximum phase distribution in the TRF pulse. signals in the susceptibility-affected areas, such as the orbitofrontal and interior temporal cortex. were increased. suggesting that the technique Could be a useful adjunct to fMRI. | - |
dc.description.sponsorship | MOST(Korean Ministry of Science and Tech-nology); Contract grant numbers; M10530010001-06N3001-00110 and M1053001002-06N3001-00210. | en |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | JOHN WILEY & SONS INC | - |
dc.subject | BOLD SENSITIVITY LOSSES | - |
dc.subject | INDUCED SIGNAL LOSS | - |
dc.subject | GRADIENT-ECHO | - |
dc.subject | FUNCTIONAL MRI | - |
dc.subject | ORBITOFRONTAL CORTEX | - |
dc.subject | Z-SHIM | - |
dc.subject | FIELD INHOMOGENEITIES | - |
dc.subject | HUMAN BRAIN | - |
dc.subject | SPIN-ECHO | - |
dc.subject | ARTIFACTS | - |
dc.title | Susceptibility Compensated fMRI Study Using a Tailored RF Echo Planar Imaging Sequence | - |
dc.type | Article | - |
dc.identifier.wosid | 000262168200029 | - |
dc.identifier.scopusid | 2-s2.0-60349110365 | - |
dc.type.rims | ART | - |
dc.citation.volume | 29 | - |
dc.citation.beginningpage | 221 | - |
dc.citation.endingpage | 228 | - |
dc.citation.publicationname | JOURNAL OF MAGNETIC RESONANCE IMAGING | - |
dc.identifier.doi | 10.1002/jmri.21397 | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Park, HyunWook | - |
dc.contributor.nonIdAuthor | Chung, JY | - |
dc.contributor.nonIdAuthor | Yoon, HW | - |
dc.contributor.nonIdAuthor | Kim, YB | - |
dc.contributor.nonIdAuthor | Cho, ZH | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | susceptibility | - |
dc.subject.keywordAuthor | fMRI | - |
dc.subject.keywordAuthor | tailored RF (TRF) | - |
dc.subject.keywordAuthor | signal loss | - |
dc.subject.keywordAuthor | orbitofrontal cortex | - |
dc.subject.keywordAuthor | interior temporal cortex | - |
dc.subject.keywordPlus | BOLD SENSITIVITY LOSSES | - |
dc.subject.keywordPlus | INDUCED SIGNAL LOSS | - |
dc.subject.keywordPlus | GRADIENT-ECHO | - |
dc.subject.keywordPlus | FUNCTIONAL MRI | - |
dc.subject.keywordPlus | ORBITOFRONTAL CORTEX | - |
dc.subject.keywordPlus | Z-SHIM | - |
dc.subject.keywordPlus | FIELD INHOMOGENEITIES | - |
dc.subject.keywordPlus | HUMAN BRAIN | - |
dc.subject.keywordPlus | SPIN-ECHO | - |
dc.subject.keywordPlus | ARTIFACTS | - |
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