A Degenerate Birdcage with Integrated Tx/Rx Switches and Butler Matrix for the Human Limbs at 7 T

Journal article

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
AuthorsStara, R., Tiberi, G., Morsani, F., Symms, M., Fantacci, M.E., Marletta, M., Zampa, V., Pendse, M., Retico, A., Rutt, B.K. and Tosetti, M.
Abstract

The theoretically known degeneracy condition of the band-pass birdcage coil has rarely been exploited in transmit coil designs. We have created an eight-channel degenerate birdcage for the human limbs at 7 T, with dedicated Tx/Rx switches and a Butler matrix. The coil can be split into two half cylinders, as required for its application to patients with limited mobility. The design of the coil, the Butler matrix, and Tx/Rx switches relied on a combination of analytical, circuital, and numerical simulations. The birdcage theory was extended to the degenerate case. The theoretical and practical aspects of the design and construction of the coil are presented. The performance of the coil was demonstrated by simulations, workbench, and scanner measurements. The fully assembled prototype presents good performance in terms of efficiency, B1 homogeneity, and signal-to-noise ratio, despite the asymmetry introduced by the splittable design. The first in vivo images of the knee are also shown. A novel RF coil design consisting of an eight-channel splittable degenerate birdcage has been developed, and it is now available for 7 T MRI applications of the human lower limbs, including high-resolution imaging of the knee cartilages and of the patellar trabecular structure.

Year2017
JournalApplied Magnetic Resonance
Journal citation48, pp. 307-326
PublisherSpringer
ISSN1613-7507
Digital Object Identifier (DOI)https://doi.org/10.1007/s00723-017-0864-2
Web address (URL)http://www.scopus.com/inward/record.url?eid=2-s2.0-85012892616&partnerID=MN8TOARS
Publication dates
Online15 Feb 2017
Publication process dates
Accepted02 Feb 2017
Deposited20 Sep 2022
Accepted author manuscript
License
File Access Level
Open
Additional information

This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s00723-017-0864-2

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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
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