Analysis and mitigation of noise in simultaneous transmission and reception in MRI

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buir.contributor.authorTaşdelen, Bilal
buir.contributor.authorSadeghi-Tarakameh, Alireza
buir.contributor.authorYılmaz, Uğur
buir.contributor.authorAtalar, Ergin
buir.contributor.orcidAtalar, Ergin|0000-0002-6874-6103
buir.contributor.orcidSadeghi-Tarakameh, Alireza|0000-0001-5718-6553
buir.contributor.orcidTaşdelen, Bilal|0000-0001-6462-3651
dc.citation.epage1758en_US
dc.citation.issueNumber3en_US
dc.citation.spage1746en_US
dc.citation.volumeNumber86en_US
dc.contributor.authorTaşdelen, Bilal
dc.contributor.authorSadeghi-Tarakameh, Alireza
dc.contributor.authorYılmaz, Uğur
dc.contributor.authorAtalar, Ergin
dc.date.accessioned2022-03-01T07:04:37Z
dc.date.available2022-03-01T07:04:37Z
dc.date.issued2021-03-05
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.description.abstractPurpose In simultaneous transmission and reception (STAR) MRI, along with the coupling of the excitation pulse to the received signal, noise, and undesired distortions (spurs) coming from the transmit chain also leak into the acquired signal and degrade image quality. Here, properties of this coupled noise and its relationship with the transmit amplifier gain, transmit chain noise density, isolation performance, and imaging bandwidth are analyzed. It is demonstrated that by utilizing a recently proposed STAR technique, the transmit noise can be reduced. The importance of achieving high isolation and careful selection of the corresponding parameters are demonstrated. Theory and Methods A cancellation algorithm, together with a vector modulator, is used for transmit-receive isolation. The scanner is modeled as a pipeline of blocks to demonstrate the noise contribution from each block. With higher isolation, coupled transmit noise can be reduced to the point that the dominant noise source becomes acquisition noise, as in the case for pulsed MRI. Amplifiers with different gain and noise properties are used in the experiments to verify the derived noise-transmit parameter relation. Results With the proposed technique, more than 80 dB isolation in the analog domain is achieved. The leakage noise and the spurs coupled from the transmit chain, are reduced. It is shown that the transmit gain plays the most critical role in determining sufficient isolation, whereas the amplifier noise figure does not contribute as much. Conclusion The transmit noise and the spurs in STAR imaging are analyzed and mitigated by using a vector modulator.en_US
dc.description.provenanceSubmitted by Esma Aytürk (esma.babayigit@bilkent.edu.tr) on 2022-03-01T07:04:37Z No. of bitstreams: 1 Analysis_and_mitigation_of_noise_in_simultaneous_transmission_and_reception_in_MRI.pdf: 1731122 bytes, checksum: 609c5d8381e4ff1fad08e7e8dde3c429 (MD5)en
dc.description.provenanceMade available in DSpace on 2022-03-01T07:04:37Z (GMT). No. of bitstreams: 1 Analysis_and_mitigation_of_noise_in_simultaneous_transmission_and_reception_in_MRI.pdf: 1731122 bytes, checksum: 609c5d8381e4ff1fad08e7e8dde3c429 (MD5) Previous issue date: 2021-03-05en
dc.embargo.release2022-03-05
dc.identifier.doi10.1002/mrm.28782en_US
dc.identifier.eissnUnited States
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/77632
dc.language.isoEnglishen_US
dc.publisherJohn Wiley & Sons, Inc.en_US
dc.relation.isversionofhttps://doi.org/10.1002/mrm.28782en_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subjectActive cancellationen_US
dc.subjectReceive noiseen_US
dc.subjectSTARen_US
dc.subjectTransmit noiseen_US
dc.titleAnalysis and mitigation of noise in simultaneous transmission and reception in MRIen_US
dc.typeArticleen_US

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