Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode Conductors
Self-decoupling technology was recently proposed for radio frequency (RF) coil array designs. Here, we propose a novel geometry to reduce the peak local specific absorption rate (SAR) and improve the robustness of the self-decoupled coil. We first demonstrate that B<sub>1</sub> is determ...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/4/1800 |
| _version_ | 1797618368506757120 |
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| author | Ming Lu Xiaoyang Zhang Shuyang Chai Xinqiang Yan |
| author_facet | Ming Lu Xiaoyang Zhang Shuyang Chai Xinqiang Yan |
| author_sort | Ming Lu |
| collection | DOAJ |
| description | Self-decoupling technology was recently proposed for radio frequency (RF) coil array designs. Here, we propose a novel geometry to reduce the peak local specific absorption rate (SAR) and improve the robustness of the self-decoupled coil. We first demonstrate that B<sub>1</sub> is determined by the arm conductors, while the maximum E-field and local SAR are determined by the feed conductor in a self-decoupled coil. Then, we investigate how the B<sub>1</sub>, E-field, local SAR, SAR efficiency, and coil robustness change with respect to different lift-off distances for feed and mode conductors. Next, the simulation of self-decoupled coils with optimal lift-off distances on a realistic human body is performed. Finally, self-decoupled coils with optimal lift-off distances are fabricated and tested on the workbench and MRI experiments. The peak 10 g-averaged SAR of the self-decoupled coil on the human body can be reduced by 34% by elevating the feed conductor. Less coil mismatching and less resonant frequency shift with respect to loadings were observed by elevating the mode conductor. Both the simulation and experimental results show that the coils with elevated conductors can preserve the high interelement isolation, B<sub>1</sub><sup>+</sup> efficiency, and SNR of the original self-decoupled coils. |
| first_indexed | 2024-03-11T08:12:00Z |
| format | Article |
| id | doaj.art-a0ee855b004a4aa7912e3877b0f25a51 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T08:12:00Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-a0ee855b004a4aa7912e3877b0f25a512023-11-16T23:06:19ZengMDPI AGSensors1424-82202023-02-01234180010.3390/s23041800Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode ConductorsMing Lu0Xiaoyang Zhang1Shuyang Chai2Xinqiang Yan3College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005, ChinaCollege of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005, ChinaVanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN 37232, USAVanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN 37232, USASelf-decoupling technology was recently proposed for radio frequency (RF) coil array designs. Here, we propose a novel geometry to reduce the peak local specific absorption rate (SAR) and improve the robustness of the self-decoupled coil. We first demonstrate that B<sub>1</sub> is determined by the arm conductors, while the maximum E-field and local SAR are determined by the feed conductor in a self-decoupled coil. Then, we investigate how the B<sub>1</sub>, E-field, local SAR, SAR efficiency, and coil robustness change with respect to different lift-off distances for feed and mode conductors. Next, the simulation of self-decoupled coils with optimal lift-off distances on a realistic human body is performed. Finally, self-decoupled coils with optimal lift-off distances are fabricated and tested on the workbench and MRI experiments. The peak 10 g-averaged SAR of the self-decoupled coil on the human body can be reduced by 34% by elevating the feed conductor. Less coil mismatching and less resonant frequency shift with respect to loadings were observed by elevating the mode conductor. Both the simulation and experimental results show that the coils with elevated conductors can preserve the high interelement isolation, B<sub>1</sub><sup>+</sup> efficiency, and SNR of the original self-decoupled coils.https://www.mdpi.com/1424-8220/23/4/1800self-decoupledSARRF coilarraydecouplinghigh field |
| spellingShingle | Ming Lu Xiaoyang Zhang Shuyang Chai Xinqiang Yan Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode Conductors Sensors self-decoupled SAR RF coil array decoupling high field |
| title | Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode Conductors |
| title_full | Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode Conductors |
| title_fullStr | Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode Conductors |
| title_full_unstemmed | Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode Conductors |
| title_short | Improving Specific Absorption Rate Efficiency and Coil Robustness of Self-Decoupled Transmit/Receive Coils by Elevating Feed and Mode Conductors |
| title_sort | improving specific absorption rate efficiency and coil robustness of self decoupled transmit receive coils by elevating feed and mode conductors |
| topic | self-decoupled SAR RF coil array decoupling high field |
| url | https://www.mdpi.com/1424-8220/23/4/1800 |
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