Chemical species separation with simultaneous estimation of field map and T-2* using a k-space formulation

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dc.contributor.authorLuis Honorato, Jose
dc.contributor.authorParot, Vicente
dc.contributor.authorTejos, Cristian
dc.contributor.authorUribe, Sergio
dc.contributor.authorIrarrazaval, Pablo
dc.date.accessioned2024-01-10T12:37:59Z
dc.date.available2024-01-10T12:37:59Z
dc.date.issued2012
dc.description.abstractChemical species separation techniques in image space are prone to incorporate several distortions. Some of these are signal accentuation in borders and geometrical warping from field inhomogeneity. These errors come from neglecting intraecho time variations. In this work, we present a new approach for chemical species separation in MRI with simultaneous estimation of field map and T?2* decay, formulated entirely in k-space. In this approach, the time map is used to model the phase accrual from off-resonance precession and also the amplitude decay due to T?2*. Our technique fits the signal model directly in k-space with the acquired data minimizing the l2-norm with an interior-point algorithm. Standard two dimensional gradient echo sequences in the thighs and head were used for demonstrating the technique. With this approach, we were able to obtain excellent estimation for the species, the field inhomogeneity, and T?2* decay images. The results do not suffer from geometric distortions derived from the chemical shift or the field inhomogeneity. Importantly, as the T?2* map is well positioned, the species signal in borders is correctly estimated. Considering intraecho time variations in a complete signal model in k-space for separating species yields superior estimation of the variables of interest when compared to existing methods. Magn Reson Med, 2012. (C) 2011 Wiley Periodicals, Inc.
dc.description.funderCONICYT
dc.format.extent9 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1002/mrm.23237
dc.identifier.issn0740-3194
dc.identifier.pubmedidMEDLINE:22212998
dc.identifier.urihttps://doi.org/10.1002/mrm.23237
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76962
dc.identifier.wosidWOS:000306318900011
dc.information.autorucIngeniería;Honorato J;S/I;154695
dc.information.autorucIngeniería;Irarrazaval P ;S/I;57376
dc.information.autorucIngeniería;Parot V ;S/I;140998
dc.information.autorucIngeniería;Tejos C ;S/I;4027
dc.information.autorucMedicina;Uribe S ;S/I;16572
dc.issue.numero2
dc.language.isoen
dc.nota.accesoSin adjunto
dc.pagina.final408
dc.pagina.inicio400
dc.publisherWILEY-BLACKWELL
dc.revistaMAGNETIC RESONANCE IN MEDICINE
dc.rightsregistro bibliográfico
dc.subjectmagnetic resonance imaging
dc.subjectchemical species separation
dc.subjectfat and water
dc.subjectfield inhomogeneities
dc.subjectoff-resonance correction
dc.subjectT?2*map
dc.subjectWATER-FAT DECOMPOSITION
dc.subjectVARIABLE PROJECTION METHOD
dc.subjectNONLINEAR LEAST-SQUARES
dc.subject2-POINT DIXON
dc.subjectINHOMOGENEITY CORRECTION
dc.subjectQUANTIFICATION
dc.subjectALGORITHM
dc.subjectMRI
dc.subjectSPECTROSCOPY
dc.subjectIMAGES
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleChemical species separation with simultaneous estimation of field map and T-2* using a k-space formulation
dc.typeartículo
dc.volumen68
sipa.codpersvinculados154695
sipa.codpersvinculados57376
sipa.codpersvinculados140998
sipa.codpersvinculados4027
sipa.codpersvinculados16572
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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