Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 유형석 | - |
dc.date.accessioned | 2022-12-06T04:34:12Z | - |
dc.date.available | 2022-12-06T04:34:12Z | - |
dc.date.issued | 2021-10 | - |
dc.identifier.citation | IEEE ACCESS, v. 9, Page. 144417-144425 | en_US |
dc.identifier.issn | 2169-3536 | en_US |
dc.identifier.uri | https://ieeexplore.ieee.org/document/9584839 | en_US |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/178017 | - |
dc.description.abstract | In a multi-element microstrip transmission line (MTL) transmit array coil, the transmit field (B-1(+)) distribution is inhomogeneous due to its standing-wave nature, and the interference effects can severely degrade the B-1(+) and imaging. Therefore, to improve the homogeneity and strength of B-1(+), this study focuses on the development of a multi-element MTL transmit array coil integrated with a dielectric liner (DL) material. Furthermore, the transmission efficiency (T-x,T-eff ) is improved in the head region. An eight-element MTL transmits array head coil is investigated using thinner DLs, and the optimized dimensions of the DL are found from its resonant mode at 7 Tesla (T). Simulations and measurements are performed with an MTL transmit array coil at 7 T, and the performance is analyzed for the DL positions and dimensions. Remarkably, the proposed DLs-integrated transmit array coil system offered significant improvements in the T(x,eff )at different DLs positions. Compared to the case without the DL, the T-x,T-eff is improved by 9% (DL close to the head model), 15% (DL at center), and 39% (DL close to the RF coil). Interestingly, the DL acts as an efficiency tuner element exhibiting a 9% to 39% T-x,T-eff tuning range of improvement. In addition, the RF-shimming technique improves the Bi F homogeneity and T-x,T-eff of the coil with DLs by 21% and 42%, respectively, compared to the case without the DL. Moreover, the specific absorption rate (SAR) analysis of the MTL transmit array coil with the DLs is performed. The peak 10g-averaged SAR is reduced from 3.1 W/kg to 2.13 W/kg in the head using DLs and RF-shimming technique. Finally, we used the bench measurement setup to obtain the measured magnetic field. The proposed work exhibits salient features with a smaller DL size and multi-element MTL transmit array coil than other proposed works. | en_US |
dc.description.sponsorship | This work was supported in part by the Institute for Information & Communications Technology Promotion (IITP) Grant funded by the Korean Government [Ministry of Science, ICT and Future Planning (MSIP)] (No. 2021-0-00490), and in part by the Development of Precision Analysis and Imaging Technology for Biological Radio Waves. | en_US |
dc.language | en | en_US |
dc.publisher | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | en_US |
dc.source | 83052_유형석.pdf | - |
dc.subject | 7 T | en_US |
dc.subject | dielectric pad | en_US |
dc.subject | eight-element | en_US |
dc.subject | MTL transmit array | en_US |
dc.subject | radio frequency (RF) coil | en_US |
dc.subject | RF shimming | en_US |
dc.subject | region of interest | en_US |
dc.title | Performance Enhancement of an MTL Coil Loaded with High-Permittivity Dielectric Liner for 7 T Brain MRI | en_US |
dc.type | Article | en_US |
dc.relation.volume | 9 | - |
dc.identifier.doi | 10.1109/ACCESS.2021.3122122 | en_US |
dc.relation.page | 144417-144425 | - |
dc.relation.journal | IEEE ACCESS | - |
dc.contributor.googleauthor | Ullah, Sana | - |
dc.contributor.googleauthor | Yoo, Hyoungsuk | - |
dc.sector.campus | S | - |
dc.sector.daehak | 공과대학 | - |
dc.sector.department | 바이오메디컬공학전공 | - |
dc.identifier.pid | hsyoo | - |
dc.identifier.orcid | https://orcid.org/0000-0001-5567-2566 | - |
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