| Local specific absorption rate in high-pass birdcage and transverse electromagnetic body coils for multiple human body models in clinical landmark positions at 3T. | |
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MedLine Citation:
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PMID: 21509880 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To use electromagnetic (EM) simulations to study the effects of body type, landmark position, and radiofrequency (RF) body coil type on peak local specific absorption rate (SAR) in 3T magnetic resonance imaging (MRI). MATERIALS AND METHODS: Numerically computed peak local SAR for four human body models (HBMs) in three landmark positions (head, heart, pelvic) were compared for a high-pass birdcage and a transverse electromagnetic 3T body coil. Local SAR values were normalized to the IEC whole-body average SAR limit of 2.0 W/kg for normal scan mode. RESULTS: Local SAR distributions were highly variable. Consistent with previous reports, the peak local SAR values generally occurred in the neck-shoulder area, near rungs, or between tissues of greatly differing electrical properties. The HBM type significantly influenced the peak local SAR, with stockier HBMs, extending extremities towards rungs, displaying the highest SAR. There was also a trend for higher peak SAR in the head-centric and heart-centric positions. The impact of the coil types studied was not statistically significant. CONCLUSION: The large variability in peak local SAR indicates the need to include more than one HBM or landmark position when evaluating safety of body coils. It is recommended that an HBM with arms near the rungs be included to create physically realizable high-SAR scenarios. |
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Authors:
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Desmond T B Yeo; Zhangwei Wang; Wolfgang Loew; Mika W Vogel; Ileana Hancu |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of magnetic resonance imaging : JMRI Volume: 33 ISSN: 1522-2586 ISO Abbreviation: J Magn Reson Imaging Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-04-21 Completed Date: 2011-10-03 Revised Date: 2012-05-02 |
Medline Journal Info:
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Nlm Unique ID: 9105850 Medline TA: J Magn Reson Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 1209-17 Citation Subset: IM |
Copyright Information:
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Copyright © 2011 Wiley-Liss, Inc. |
Affiliation:
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General Electric Global Research, Imaging Technologies, Niskayuna, New York, USA. yeot@ge.com |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Absorption Computer Simulation Female Head / physiology Humans Magnetic Resonance Imaging / methods* Male Models, Anatomic Models, Statistical Radiation Reproducibility of Results Whole Body Imaging / methods* |
| Grant Support | |
ID/Acronym/Agency:
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R01 EB005307-03/EB/NIBIB NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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