SAR prediction in adults and children by combining measured B1+ maps and simulations at 7.0 Tesla

Journal article


Tiberi, G., Costagli, M., Biagi, L., Ciantis, A.D., Fontana, N., Stara, R., Symms, M.R., Cosottini, M., Guerrini, R. and Tosetti, M. (2016). SAR prediction in adults and children by combining measured B1+ maps and simulations at 7.0 Tesla. Journal of Magnetic Resonance Imaging. 44 (4), pp. 1048-1055. https://doi.org/10.1002/jmri.25241
AuthorsTiberi, G., Costagli, M., Biagi, L., Ciantis, A.D., Fontana, N., Stara, R., Symms, M.R., Cosottini, M., Guerrini, R. and Tosetti, M.
Abstract

Purpose
To predict local and global specific absorption rate (SAR) in individual subjects.

Materials and Methods
SAR was simulated for a head volume coil for two imaging sequences: axial T1-weighted “zero” time-of-echo (ZTE) sequence, sagittal T2-weighted fluid attenuated inversion recovery (FLAIR). Two head models (one adult, one child) were simulated inside the coil. For 19 adults and 27 children, measured B1+ maps were acquired, and global (head) SAR estimated by the system was recorded. We performed t-test between the B1+ in models and human subjects. The B1+ maps of individual subjects were used to scale the SAR simulated on the models, to predict local and global (head) SAR. A phantom experiment was performed to validate SAR prediction, using a fiberoptic temperature probe to measure the temperature rise due to ZTE scanning.

Results
The normalized B1+ standard deviation in subjects was not significantly different from that of the models (P > 0.68 and P > 0.54). The rise in temperature generated in the phantom by ZTE was 0.3°C; from the heat equation it followed that the temperature-based measured SAR was 2.74 W/kg, while the predicted value was 3.1 W/kg.

Conclusion
For ZTE and FLAIR, limits on maximum local and global SAR were met in all subjects, both adults and children. To enhance safety in adults and children with 7.0 Tesla MR systems, we suggest the possibility of using SAR prediction. J. MAGN. RESON. IMAGING 2016;44:1048–1055.

Year2016
JournalJournal of Magnetic Resonance Imaging
Journal citation44 (4), pp. 1048-1055
PublisherWiley
ISSN1522-2586
Digital Object Identifier (DOI)https://doi.org/10.1002/jmri.25241
Web address (URL)http://www.scopus.com/inward/record.url?eid=2-s2.0-84987984823&partnerID=MN8TOARS
Publication dates
Online01 Apr 2016
Publication process dates
Accepted01 Mar 2016
Deposited02 Aug 2022
Accepted author manuscript
License
File Access Level
Open
Additional information

This is the peer reviewed version of the following article: SAR prediction in adults and children by combining measured B1+ maps and simulations at 7.0 Tesla, which has been published in final form at https://onlinelibrary.wiley.com/doi/10.1002/jmri.25241. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited

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