A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging
Improvements in transmission and reception sensitivities of radiofrequency (RF) coils used in ultra-high field (UHF) magnetic resonance imaging (MRI) are needed to reduce specific absorption rates (SAR) and RF power deposition, albeit without applying high-power RF. Here, we propose a method to simu...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-02-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/22/5/1741 |
| _version_ | 1797473786989117440 |
|---|---|
| author | Jeung-Hoon Seo Yeji Han Jun-Young Chung |
| author_facet | Jeung-Hoon Seo Yeji Han Jun-Young Chung |
| author_sort | Jeung-Hoon Seo |
| collection | DOAJ |
| description | Improvements in transmission and reception sensitivities of radiofrequency (RF) coils used in ultra-high field (UHF) magnetic resonance imaging (MRI) are needed to reduce specific absorption rates (SAR) and RF power deposition, albeit without applying high-power RF. Here, we propose a method to simultaneously improve transmission efficiency and reception sensitivity of a band-pass birdcage RF coil (BP-BC RF coil) by combining a multi-channel wireless RF element (MCWE) with a high permittivity material (HPM) in a 7.0 T MRI. Electromagnetic field (EM-field) simulations, performed using two types of phantoms, viz., a cylindrical phantom filled with oil and a human head model, were used to compare the effects of MCWE and HPM on BP-BC RF coils. EM-fields were calculated using the finite difference time-domain (FDTD) method and analyzed using Matlab software. Next, to improve RF transmission efficiency, we compared two HPM structures, namely, a hollow cylinder shape HPM (<i>hc</i>HPM) and segmented cylinder shape HPM (<i>sc</i>HPM). The <i>sc</i>HPM and MCWE model comprised 16 elements (16-rad BP-BC RF coil) and this coil configuration demonstrated superior RF transmission efficiency and reception sensitivity along with an acceptable SAR. We expect wider clinical application of this combination in 7.0 T MRIs, which were recently approved by the United States Food and Drug Administration. |
| first_indexed | 2024-03-09T20:22:21Z |
| format | Article |
| id | doaj.art-6e8cdf61ffd04868ab7c7a57fd187b2c |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T20:22:21Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-6e8cdf61ffd04868ab7c7a57fd187b2c2023-11-23T23:45:28ZengMDPI AGSensors1424-82202022-02-01225174110.3390/s22051741A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance ImagingJeung-Hoon Seo0Yeji Han1Jun-Young Chung2Neuroscience Research Institute, Gachon University, Incheon 21988, KoreaDepartment of Biomedical Engineering, Gachon University, Incheon 21936, KoreaDepartment of Neuroscience, College of Medicine, Gachon University, Incheon 21565, KoreaImprovements in transmission and reception sensitivities of radiofrequency (RF) coils used in ultra-high field (UHF) magnetic resonance imaging (MRI) are needed to reduce specific absorption rates (SAR) and RF power deposition, albeit without applying high-power RF. Here, we propose a method to simultaneously improve transmission efficiency and reception sensitivity of a band-pass birdcage RF coil (BP-BC RF coil) by combining a multi-channel wireless RF element (MCWE) with a high permittivity material (HPM) in a 7.0 T MRI. Electromagnetic field (EM-field) simulations, performed using two types of phantoms, viz., a cylindrical phantom filled with oil and a human head model, were used to compare the effects of MCWE and HPM on BP-BC RF coils. EM-fields were calculated using the finite difference time-domain (FDTD) method and analyzed using Matlab software. Next, to improve RF transmission efficiency, we compared two HPM structures, namely, a hollow cylinder shape HPM (<i>hc</i>HPM) and segmented cylinder shape HPM (<i>sc</i>HPM). The <i>sc</i>HPM and MCWE model comprised 16 elements (16-rad BP-BC RF coil) and this coil configuration demonstrated superior RF transmission efficiency and reception sensitivity along with an acceptable SAR. We expect wider clinical application of this combination in 7.0 T MRIs, which were recently approved by the United States Food and Drug Administration.https://www.mdpi.com/1424-8220/22/5/1741inductively coupled wireless elementhigh permittivity materialFDTD methodbirdcage RF coil7.0 T MRI |
| spellingShingle | Jeung-Hoon Seo Yeji Han Jun-Young Chung A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging Sensors inductively coupled wireless element high permittivity material FDTD method birdcage RF coil 7.0 T MRI |
| title | A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging |
| title_full | A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging |
| title_fullStr | A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging |
| title_full_unstemmed | A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging |
| title_short | A Comparative Study of Birdcage RF Coil Configurations for Ultra-High Field Magnetic Resonance Imaging |
| title_sort | comparative study of birdcage rf coil configurations for ultra high field magnetic resonance imaging |
| topic | inductively coupled wireless element high permittivity material FDTD method birdcage RF coil 7.0 T MRI |
| url | https://www.mdpi.com/1424-8220/22/5/1741 |
| work_keys_str_mv | AT jeunghoonseo acomparativestudyofbirdcagerfcoilconfigurationsforultrahighfieldmagneticresonanceimaging AT yejihan acomparativestudyofbirdcagerfcoilconfigurationsforultrahighfieldmagneticresonanceimaging AT junyoungchung acomparativestudyofbirdcagerfcoilconfigurationsforultrahighfieldmagneticresonanceimaging AT jeunghoonseo comparativestudyofbirdcagerfcoilconfigurationsforultrahighfieldmagneticresonanceimaging AT yejihan comparativestudyofbirdcagerfcoilconfigurationsforultrahighfieldmagneticresonanceimaging AT junyoungchung comparativestudyofbirdcagerfcoilconfigurationsforultrahighfieldmagneticresonanceimaging |