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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A Degenerate Birdcage with Integrated Tx/Rx Switches and Butler Matrix for the Human Limbs at 7 T
Stara, R., Tiberi, G., Morsani, F., Symms, M., Fantacci, M.E., Marletta, M., Zampa, V., Pendse, M., Retico, A., Rutt, B.K. and Tosetti, M. (2017). A Degenerate Birdcage with Integrated Tx/Rx Switches and Butler Matrix for the Human Limbs at 7 T. Applied Magnetic Resonance. 48, pp. 307-326. https://doi.org/10.1007/s00723-017-0864-2
Evaluation of temperature increase during Magnetic Resonance examinations by combining electromagnetic/thermal simulations and B1 maps
Fontana, N., Symms, M.R., Tiberi, G., Tosetti, M., Costagli, M. and Monorchio, A. (2017). Evaluation of temperature increase during Magnetic Resonance examinations by combining electromagnetic/thermal simulations and B1 maps. 2017 International Applied Computational Electromagnetics Society Symposium. Italy 26 Mar - 30 Apr 2022 Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.23919/ropaces.2017.7916417
Distributed trap FSS filter for dual tuned RF MRI coil decoupling at 7.0T
Fontana, N., Costa, F., Tiberi, G., Nigro, L. and Monorchio, A. (2017). Distributed trap FSS filter for dual tuned RF MRI coil decoupling at 7.0T. 2017 International Conference on Electromagnetics in Advanced Applications (ICEAA). 11 - 15 Sep 2017 https://doi.org/10.1109/iceaa.2017.8065492
Finite element method-based approach for radiofrequency magnetic resonance coil losses estimation
Giovannetti, G., Tiberi, G. and Tosetti, M. (2016). Finite element method-based approach for radiofrequency magnetic resonance coil losses estimation. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. 46B (4), pp. 186-190. https://doi.org/10.1002/cmr.b.21348
Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications
Giovannetti, G. and Tiberi, G. (2016). Skin Effect Estimation in Radiofrequency Coils for Nuclear Magnetic Resonance Applications. Applied Magnetic Resonance. 47, pp. 601-612. https://doi.org/10.1007/s00723-016-0780-x
Huygens Principle based UWB Microwave Imaging Method for Skin Cancer Detection
Ghavami, N, Tiberi, G, Ghavami, M, Dudley, S and Lane, ME (2016). Huygens Principle based UWB Microwave Imaging Method for Skin Cancer Detection. 10th IEEE/IET International Symposium on Communication Systems, Networks and Digital Signal Processing. Prague, Czech Republic 20 - 22 Jul 2016 Institute of Electrical and Electronics Engineers (IEEE).
Quadrature birdcage coil with distributed capacitors for 7.0 T magnetic resonance data acquisition of small animals
Stara, R., Tiberi, G., Gabrieli, M., Buonincontri, G., Fontana, N., Monorchio, A., Costagli, M., Symms, M.R., Retico, A. and Tosetti, M. (2015). Quadrature birdcage coil with distributed capacitors for 7.0 T magnetic resonance data acquisition of small animals. Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. https://doi.org/10.1002/cmr.b.21271
Evaluation of 3D radio-frequency electromagnetic fields for any matching and coupling conditions by the use of basis functions
Tiberi, G., Fontana, N., Monorchio, A., Stara, R., Retico, A. and Tosetti, M. (2015). Evaluation of 3D radio-frequency electromagnetic fields for any matching and coupling conditions by the use of basis functions. Journal of Magnetic Resonance. 261, pp. 38-42. https://doi.org/10.1016/j.jmr.2015.09.015
Non-iterative beamforming based on Huygens principle for multistatic ultrawide band radar: Application to breast imaging
Ghavami, N., Smith, P.P., Tiberi, G., Edwards, D. and Craddock, I. (2015). Non-iterative beamforming based on Huygens principle for multistatic ultrawide band radar: Application to breast imaging. IET Microwaves, Antennas and Propagation. 9 (12), pp. 1233-1240. https://doi.org/10.1049/iet-map.2014.0621
Non-invasive assessment of Neuromuscular Disorders by 7 tesla Magnetic Resonance Imaging and Spectroscopy: Dedicated radio-frequency coil development
Retico, A., Stara, R., Fantacci, M.E., Toncelli, A., Galante, A., Florio, T.M., Alecci, M., Cosottini, M., Astrea, G., Battini, R., Tiberi, G., Costagli, M. and Tosetti, M. (2015). Non-invasive assessment of Neuromuscular Disorders by 7 tesla Magnetic Resonance Imaging and Spectroscopy: Dedicated radio-frequency coil development. 2015 IEEE International Symposium on Medical Measurements and Applications, MeMeA 2015. Torino, Italy 07 - 09 May 2015 Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/memea.2015.7145174
Assessment of Silent T1-weighted head imaging at 7 T
Costagli, M., Symms, M.R., Angeli, L., Kelley, D.A.C., Biagi, L., Farnetani, A., Rua, C., Donatelli, G., Tiberi, G., Tosetti, M. and Cosottini, M. (2015). Assessment of Silent T1-weighted head imaging at 7 T. European Radiology. 26, pp. 1879-1888. https://doi.org/10.1007/s00330-015-3954-2
Design of Interference-Resilient Medium Access for High Throughput WLANs
Reggiani, L., Gola, A., Maggio, G.M. and Tiberi, G. (2015). Design of Interference-Resilient Medium Access for High Throughput WLANs. International Journal of Distributed Sensor Networks. https://doi.org/10.1155/2015/659569
Local SAR in adults and children at 7T MR: Realistic estimation by the using of simulations
Fontana, N., Tiberi, G., Stara, R., Monorchio, A., Retico, A. and Tosetti, M. (2014). Local SAR in adults and children at 7T MR: Realistic estimation by the using of simulations. 2014 International Conference on Electromagnetics in Advanced Applications (ICEAA). 03 - 08 Aug 2014 https://doi.org/10.1109/iceaa.2014.6903858
Tissue Border Enhancement by inversion recovery MRI at 7.0 Tesla.
Costagli M, Kelley DA, Symms MR, Biagi L, Stara R, Maggioni E, Tiberi G, Barba C, Guerrini R, Cosottini M and Tosetti M (2014). Tissue Border Enhancement by inversion recovery MRI at 7.0 Tesla. Neuroradiology. 56, pp. 517-523. https://doi.org/10.1007/s00234-014-1365-8
Short-term side-effects of brain MR examination at 7 T: a single-centre experience.
Cosottini M, Frosini D, Biagi L, Pesaresi I, Costagli M, Tiberi G, Symms M and Tosetti M (2014). Short-term side-effects of brain MR examination at 7 T: a single-centre experience. European Radiology. https://doi.org/10.1007/s00330-014-3177-y
STEAM-MiTiS: An MR spectroscopy method for the detection of scalar-coupled metabolites and its application to glutamate at 7 T
Toncelli, A., Noeske, R., Cosottini, M., Costagli, M., Domenici, V., Tiberi, G. and Tosetti, M. (2014). STEAM-MiTiS: An MR spectroscopy method for the detection of scalar-coupled metabolites and its application to glutamate at 7 T. Magnetic Resonance in Medicine. 74 (6), pp. 1515-1522. https://doi.org/10.1002/mrm.25556
Huygens principle based imaging of multilayered objects with inclusions
Ghavami, N., Tiberi, G., Edwards, D.J., Safaai-Jazi, A. and Monorchio, A. (2014). Huygens principle based imaging of multilayered objects with inclusions. Progress In Electromagnetics Research B. 58, pp. 139-149. https://doi.org/10.2528/pierb13121002