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dc.contributor.authorBuonincontri, Guidoen
dc.contributor.authorSawiak, Stephenen
dc.date.accessioned2015-12-15T16:06:16Z
dc.date.available2015-12-15T16:06:16Z
dc.date.issued2015-10-28en
dc.identifier.citationBuonincontri & Sawiak. Magnetic Resonance in Medicine (2015). doi: 10.1002/mrm.26009en
dc.identifier.issn0740-3194
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/252988
dc.description.abstractPurpose MR fingerprinting (MRF) can be used for quantitative estimation of physical parameters in MRI. Here, we extend the method to incorporate B1 estimation. Methods The acquisition is based on steady state free precession MR fingerprinting with a Cartesian trajectory. To increase the sensitivity to the B1 profile, abrupt changes in flip angle were introduced in the sequence. Slice profile and B1 effects were included in the dictionary and the results from two- and three-dimensional (3D) acquisitions were compared. Acceleration was demonstrated using retrospective undersampling in the phase encode directions of 3D data exploiting redundancy between MRF frames at the edges of k-space. Results Without B1 estimation, T2 and B1 were inaccurate by more than 20%. Abrupt changes in flip angle improved B1 maps. T1 and T2 values obtained with the new MRF methods agree with classical spin echo measurements and are independent of the B1 field profile. When using view sharing reconstruction, results remained accurate (error <10%) when sampling under 10% of k-space from the 3D data. Conclusion The methods demonstrated here can successfully measure T1, T2, and B1. Errors due to slice profile can be substantially reduced by including its effect in the dictionary or acquiring data in 3D. Magn Reson Med, 2015. © 2015 Wiley Periodicals, Inc.
dc.description.sponsorshipG.B. was funded by INFN CNS 5.
dc.languageEnglishen
dc.language.isoenen
dc.publisherWiley
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectMRFen
dc.subjectfingerprintingen
dc.subject3Den
dc.subjectB1en
dc.subjectT1en
dc.subjectT2en
dc.subjectrelaxometryen
dc.titleMR fingerprinting with simultaneous B1 estimationen
dc.typeArticle
dc.description.versionThis is the author accepted manuscript. The final version is available from Wiley via http://dx.doi.org/10.1002/mrm.26009en
prism.publicationDate2015en
prism.publicationNameMagnetic Resonance In Medicineen
dcterms.dateAccepted2015-09-14en
rioxxterms.versionofrecord10.1002/mrm.26009en
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2015-10-28en
dc.contributor.orcidSawiak, Stephen [0000-0003-4210-9816]
dc.identifier.eissn1522-2594
rioxxterms.typeJournal Article/Reviewen
cam.orpheus.successThu Jan 30 12:55:29 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial-NoDerivatives 4.0 International