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Article: B1 field, SAR, and SNR comparisons for birdcage, TEM, and microstrip coils at 7T

TitleB1 field, SAR, and SNR comparisons for birdcage, TEM, and microstrip coils at 7T
Authors
Issue Date2006
PublisherJohn Wiley & Sons, Inc. The Journal's web site is located at http://www.interscience.wiley.com/jpages/1053-1807/
Citation
Journal of Magnetic Resonance Imaging, 2006, v. 24, p. 439-443 How to Cite?
AbstractPURPOSE: To compare the performance of birdcage, transverse electromagnetic (TEM) and microstrip volume coils at 7T under the same geometric conditions. MATERIALS AND METHODS: Birdcage, TEM, and microstrip coils are modeled with the same dimensions. The finite difference time domain (FDTD) method is adopted to calculate the electromagnetic fields of the coils. Further, B(1) field, specific absorption rate (SAR) and signal-to-noise ratio (SNR) are calculated for these coils. RESULTS: In the unloaded case, within the central axial plane, the variation of B(1) field magnitude over 18-cm distance is about 15% for the birdcage coil, 23% for the TEM coil, and 38% for the microstrip coil. In the loaded case, the percentages of the samples on the central axial plane, which have B(1) field magnitude within +/-20% of the average B(1) field magnitude, are about 57% for the birdcage, 72% for the TEM, and 59% for the microstrip coil. Average SAR levels are 11.4% and 42.9% higher in the birdcage than those in the TEM and microstrip coils, respectively. The average relative SNR on the central axial plane for the shielded birdcage, TEM, and microstrip coils are 1, 1.07, and 1.48, respectively. CONCLUSION: The birdcage coil has the best unloaded B(1) field homogeneity, and the TEM coil has the best loaded B(1) field homogeneity and the lowest radiation loss; while the microstrip coil is better in SAR and SNR at 7T than the birdcage and TEM coils.
Persistent Identifierhttp://hdl.handle.net/10722/73847
ISSN
2015 Impact Factor: 3.25
2015 SCImago Journal Rankings: 1.683

 

DC FieldValueLanguage
dc.contributor.authorWang, C-
dc.contributor.authorShen, GX-
dc.date.accessioned2010-09-06T06:55:20Z-
dc.date.available2010-09-06T06:55:20Z-
dc.date.issued2006-
dc.identifier.citationJournal of Magnetic Resonance Imaging, 2006, v. 24, p. 439-443-
dc.identifier.issn1053-1807-
dc.identifier.urihttp://hdl.handle.net/10722/73847-
dc.description.abstractPURPOSE: To compare the performance of birdcage, transverse electromagnetic (TEM) and microstrip volume coils at 7T under the same geometric conditions. MATERIALS AND METHODS: Birdcage, TEM, and microstrip coils are modeled with the same dimensions. The finite difference time domain (FDTD) method is adopted to calculate the electromagnetic fields of the coils. Further, B(1) field, specific absorption rate (SAR) and signal-to-noise ratio (SNR) are calculated for these coils. RESULTS: In the unloaded case, within the central axial plane, the variation of B(1) field magnitude over 18-cm distance is about 15% for the birdcage coil, 23% for the TEM coil, and 38% for the microstrip coil. In the loaded case, the percentages of the samples on the central axial plane, which have B(1) field magnitude within +/-20% of the average B(1) field magnitude, are about 57% for the birdcage, 72% for the TEM, and 59% for the microstrip coil. Average SAR levels are 11.4% and 42.9% higher in the birdcage than those in the TEM and microstrip coils, respectively. The average relative SNR on the central axial plane for the shielded birdcage, TEM, and microstrip coils are 1, 1.07, and 1.48, respectively. CONCLUSION: The birdcage coil has the best unloaded B(1) field homogeneity, and the TEM coil has the best loaded B(1) field homogeneity and the lowest radiation loss; while the microstrip coil is better in SAR and SNR at 7T than the birdcage and TEM coils.-
dc.languageeng-
dc.publisherJohn Wiley & Sons, Inc. The Journal's web site is located at http://www.interscience.wiley.com/jpages/1053-1807/-
dc.relation.ispartofJournal of Magnetic Resonance Imaging-
dc.rightsJournal of Magnetic Resonance Imaging. Copyright © John Wiley & Sons, Inc.-
dc.rightsSpecial Statement for Preprint only Before publication: 'This is a preprint of an article accepted for publication in [The Journal of Pathology] Copyright © ([year]) ([Pathological Society of Great Britain and Ireland])'. After publication: the preprint notice should be amended to follows: 'This is a preprint of an article published in [include the complete citation information for the final version of the Contribution as published in the print edition of the Journal]' For Cochrane Library/ Cochrane Database of Systematic Reviews, add statement & acknowledgement : ‘This review is published as a Cochrane Review in the Cochrane Database of Systematic Reviews 20XX, Issue X. Cochrane Reviews are regularly updated as new evidence emerges and in response to comments and criticisms, and the Cochrane Database of Systematic Reviews should be consulted for the most recent version of the Review.’ Please include reference to the Review and hyperlink to the original version using the following format e.g. Authors. Title of Review. Cochrane Database of Systematic Reviews 20XX, Issue #. Art. No.: CD00XXXX. DOI: 10.1002/14651858.CD00XXXX (insert persistent link to the article by using the URL: http://dx.doi.org/10.1002/14651858.CD00XXXX) (This statement should refer to the most recent issue of the Cochrane Database of Systematic Reviews in which the Review published.)-
dc.subject.meshElectromagnetic Fields-
dc.subject.meshHumans-
dc.subject.meshMagnetic Resonance Imaging - instrumentation-
dc.subject.meshPhantoms, Imaging-
dc.subject.meshRadio Waves-
dc.titleB1 field, SAR, and SNR comparisons for birdcage, TEM, and microstrip coils at 7T-
dc.typeArticle-
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1053-1807&volume=24&spage=439&epage=443&date=2006&atitle=B1+Field,+SAR+and+SNR+Comparisions+for+Birdcage,+TEM+and+Microstrip+Coils+at+7Ten_HK
dc.identifier.emailShen, GX: gxshen@eee.hku.hk-
dc.identifier.authorityShen, GX=rp00166-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/jmri.20635-
dc.identifier.pmid16786582-
dc.identifier.scopuseid_2-s2.0-33746918314-
dc.identifier.hkuros121250-
dc.identifier.volume24-
dc.identifier.spage439-
dc.identifier.epage443-
dc.publisher.placeUnited States-

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