Biplanar quadrature coil for versatile low-field extremity MRI
Biplanar magnets offer extended flexibility in MRI, particularly appealing due to unmatched accessibility to the patient. At low field strength (<0.2 T), such geometries could be particularly suitable for interventional settings or purpose-built applications such as musculoskeletal imaging. I...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-08-01
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| Series: | Frontiers in Physics |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2023.987197/full |
| _version_ | 1797741583455485952 |
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| author | Maksym Yushchenko Philippe Choquet Philippe Choquet Philippe Choquet Philippe Choquet Najat Salameh Najat Salameh Mathieu Sarracanie Mathieu Sarracanie |
| author_facet | Maksym Yushchenko Philippe Choquet Philippe Choquet Philippe Choquet Philippe Choquet Najat Salameh Najat Salameh Mathieu Sarracanie Mathieu Sarracanie |
| author_sort | Maksym Yushchenko |
| collection | DOAJ |
| description | Biplanar magnets offer extended flexibility in MRI, particularly appealing due to unmatched accessibility to the patient. At low field strength (<0.2 T), such geometries could be particularly suitable for interventional settings or purpose-built applications such as musculoskeletal imaging. In the proposed work, we present a dual-channel, biplanar coil array for low-field MRI featuring almost fully open access when sited in a biplanar magnet. The proposed detector relies on the assembly of two orthogonal biplanar coils (single transmit channel, two receive channels in quadrature) respectively interfaced with custom inductive couplers. Simulations of the B1 field in each element were performed before the quadrature coil was built and used at ∼ 0.1 T (4.33 MHz). Once assembled, the best performance in our setup was achieved in undermatched conditions in place of conventional 50-Ω matching. Phantom images display the extended coverage of the quadrature coil, with similar SNR from each individual biplanar coil. The combined images show an expected SNR gain of 2 that confirms good decoupling between the two channels (−36 dB). To the best of our knowledge, the proposed coil represents the first implementation of a biplanar geometry at low field and the first quadrature detection for a biplanar design. The open design and overall good sensitivity of our biplanar design enabled fast and quasi-isotropic 3D imaging with (1.6 × 1.6 × 2.2) mm3 resolution in vivo in human extremities. |
| first_indexed | 2024-03-12T14:28:48Z |
| format | Article |
| id | doaj.art-debbd4f0771840458e9634834cc84ba1 |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-03-12T14:28:48Z |
| publishDate | 2023-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-debbd4f0771840458e9634834cc84ba12023-08-17T19:36:01ZengFrontiers Media S.A.Frontiers in Physics2296-424X2023-08-011110.3389/fphy.2023.987197987197Biplanar quadrature coil for versatile low-field extremity MRIMaksym Yushchenko0Philippe Choquet1Philippe Choquet2Philippe Choquet3Philippe Choquet4Najat Salameh5Najat Salameh6Mathieu Sarracanie7Mathieu Sarracanie8Center for Adaptable MRI Technology (AMT Center), Department of Biomedical Engineering, University of Basel, Allschwil, SwitzerlandCenter for Adaptable MRI Technology (AMT Center), Department of Biomedical Engineering, University of Basel, Allschwil, SwitzerlandImagerie Préclinique—UF6237, Pôle d’Imagerie, Hôpitaux Universitaires de Strasbourg, Strasbourg, FranceIcube, Équipe Matériaux Multi échelles et Biomécanique (MMB), Centre national de la recherche scientifique (CNRS), University of Strasbourg, Strasbourg, FranceFédération de Médecine Translationnelle de Strasbourg, Faculté de Médecine, University of Strasbourg, Strasbourg, FranceCenter for Adaptable MRI Technology (AMT Center), Department of Biomedical Engineering, University of Basel, Allschwil, SwitzerlandAMT Center, Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, United KingdomCenter for Adaptable MRI Technology (AMT Center), Department of Biomedical Engineering, University of Basel, Allschwil, SwitzerlandAMT Center, Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, United KingdomBiplanar magnets offer extended flexibility in MRI, particularly appealing due to unmatched accessibility to the patient. At low field strength (<0.2 T), such geometries could be particularly suitable for interventional settings or purpose-built applications such as musculoskeletal imaging. In the proposed work, we present a dual-channel, biplanar coil array for low-field MRI featuring almost fully open access when sited in a biplanar magnet. The proposed detector relies on the assembly of two orthogonal biplanar coils (single transmit channel, two receive channels in quadrature) respectively interfaced with custom inductive couplers. Simulations of the B1 field in each element were performed before the quadrature coil was built and used at ∼ 0.1 T (4.33 MHz). Once assembled, the best performance in our setup was achieved in undermatched conditions in place of conventional 50-Ω matching. Phantom images display the extended coverage of the quadrature coil, with similar SNR from each individual biplanar coil. The combined images show an expected SNR gain of 2 that confirms good decoupling between the two channels (−36 dB). To the best of our knowledge, the proposed coil represents the first implementation of a biplanar geometry at low field and the first quadrature detection for a biplanar design. The open design and overall good sensitivity of our biplanar design enabled fast and quasi-isotropic 3D imaging with (1.6 × 1.6 × 2.2) mm3 resolution in vivo in human extremities.https://www.frontiersin.org/articles/10.3389/fphy.2023.987197/fulllow-field MRIquadrature RF coilbiplanar coil arrayextremity imagingversatile open design |
| spellingShingle | Maksym Yushchenko Philippe Choquet Philippe Choquet Philippe Choquet Philippe Choquet Najat Salameh Najat Salameh Mathieu Sarracanie Mathieu Sarracanie Biplanar quadrature coil for versatile low-field extremity MRI Frontiers in Physics low-field MRI quadrature RF coil biplanar coil array extremity imaging versatile open design |
| title | Biplanar quadrature coil for versatile low-field extremity MRI |
| title_full | Biplanar quadrature coil for versatile low-field extremity MRI |
| title_fullStr | Biplanar quadrature coil for versatile low-field extremity MRI |
| title_full_unstemmed | Biplanar quadrature coil for versatile low-field extremity MRI |
| title_short | Biplanar quadrature coil for versatile low-field extremity MRI |
| title_sort | biplanar quadrature coil for versatile low field extremity mri |
| topic | low-field MRI quadrature RF coil biplanar coil array extremity imaging versatile open design |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2023.987197/full |
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