Active decoupling of RF coils using a transmit array system

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buir.contributor.authorAtalar, Ergin
dc.citation.epage576en_US
dc.citation.issueNumber6en_US
dc.citation.spage565en_US
dc.citation.volumeNumber28en_US
dc.contributor.authorÖzen, A. C.en_US
dc.contributor.authorBock, M.en_US
dc.contributor.authorAtalar, Erginen_US
dc.date.accessioned2016-02-08T10:47:24Z
dc.date.available2016-02-08T10:47:24Z
dc.date.issued2015en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractObjective: Implementation of a decoupling method for isolation of transmit and receive radio frequency (RF) coils for concurrent excitation and acquisition (CEA) MRI in samples with ultra-short T2*. Materials and methods: The new phase and amplitude (PA) decoupling method is implemented in a clinical 3T-MRI system equipped with a parallel transmit array system. For RF excitation, two transmit coils are used in combination with a single receive coil. The transmit coil is geometrically decoupled from the receive coil, and the remaining B1-induced voltages in the receive coil during CEA are minimized by the second transmit coil using a careful adjustment of the phase and amplitude settings in this coil. Isolation of the decoupling scheme and transmit noise behavior are analyzed for different loading conditions, and a CEA MRI experiment is performed in a rubber phantom with sub-millisecond T2* and in an ex vivo animal. Results: Geometrical (20 dB) and PA decoupling (50 dB) provided a total isolation of 70 dB between the transmit and receive coils. Integration of a low-noise RF amplifier was necessary to minimize RF transmit noise. CEA MR images could be reconstructed from a rubber phantom and an ex vivo animal. Conclusion: CEA MRI can be implemented in clinical MRI systems using active decoupling with parallel transmit array capabilities with minor hardware modifications.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T10:47:24Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2015en
dc.identifier.doi10.1007/s10334-015-0497-0en_US
dc.identifier.issn0968-5243
dc.identifier.urihttp://hdl.handle.net/11693/25591
dc.language.isoEnglishen_US
dc.publisherSpringer Verlagen_US
dc.relation.isversionofhttp://dx.doi.org/10.1007/s10334-015-0497-0en_US
dc.source.titleMagnetic Resonance Materials in Physics, Biology and Medicineen_US
dc.subjectConcurrent excitation and acquisitionen_US
dc.subjectContinuous-wave NMRen_US
dc.subjectGeometrical decouplingen_US
dc.subjectPhase amplitude decouplingen_US
dc.subjectTransmit arrayen_US
dc.titleActive decoupling of RF coils using a transmit array systemen_US
dc.typeArticleen_US

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