Radiative MRI coil design using parasitic scatterers: MRI Yagi
(2018) In IEEE Transactions on Antennas and Propagation 66(3). p.1570-1575- Abstract
- Conventionally, radiofrequency (RF) coils used for magnetic resonance imaging (MRI) are electrically small and designed for nearfield operation. Therefore, existing antenna design techniques are mostly irrelevant for RF coils. However, the use of higher frequencies in ultrahigh field (UHF) MRI allows for antenna design techniques to be adapted to RF coil designs. This study proposes the use of parasitic scatterers to improve the performance of an existing 7T MRI coil called the single-sided adapted dipole (SSAD) antenna. The results reveal that scatterers arranged in a Yagi fashion can be applied to reduce local specific absorption rate (SAR) maxima of a reference SSAD by 40% with only a 6% decrease in the propagated B1+ field at the... (More)
- Conventionally, radiofrequency (RF) coils used for magnetic resonance imaging (MRI) are electrically small and designed for nearfield operation. Therefore, existing antenna design techniques are mostly irrelevant for RF coils. However, the use of higher frequencies in ultrahigh field (UHF) MRI allows for antenna design techniques to be adapted to RF coil designs. This study proposes the use of parasitic scatterers to improve the performance of an existing 7T MRI coil called the single-sided adapted dipole (SSAD) antenna. The results reveal that scatterers arranged in a Yagi fashion can be applied to reduce local specific absorption rate (SAR) maxima of a reference SSAD by 40% with only a 6% decrease in the propagated B1+ field at the tissue depth of 15 cm. The higher directivity of the proposed design also decreasing the coupling with additional elements, making this antenna suitable for use in high density arrays. These findings show the potential of parasitic scatterers as an effective method to improve the performance of existing radiative MRI coils. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/c9884187-e870-4363-b99a-45ce5d289229
- author
- Sanchez, Juan-Diego LU ; Avendal, Johan ; Bibic, Adnan LU and Lau, Buon Kiong LU
- organization
- publishing date
- 2018-03
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- magnetic resonance imaging, Yagi-Uda antennas, electromagnetic propagation in absorbing media, specific absorption rate
- in
- IEEE Transactions on Antennas and Propagation
- volume
- 66
- issue
- 3
- pages
- 6 pages
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- external identifiers
-
- scopus:85040951559
- ISSN
- 0018-926X
- DOI
- 10.1109/TAP.2018.2794400
- project
- ELLIIT LU P01: 5G Wireless
- EIT_Optantsys Novel Antenna System Design Paradigm for High Performance Mobile Communications
- language
- English
- LU publication?
- yes
- id
- c9884187-e870-4363-b99a-45ce5d289229
- date added to LUP
- 2017-12-12 14:32:34
- date last changed
- 2022-05-03 00:07:13
@article{c9884187-e870-4363-b99a-45ce5d289229, abstract = {{Conventionally, radiofrequency (RF) coils used for magnetic resonance imaging (MRI) are electrically small and designed for nearfield operation. Therefore, existing antenna design techniques are mostly irrelevant for RF coils. However, the use of higher frequencies in ultrahigh field (UHF) MRI allows for antenna design techniques to be adapted to RF coil designs. This study proposes the use of parasitic scatterers to improve the performance of an existing 7T MRI coil called the single-sided adapted dipole (SSAD) antenna. The results reveal that scatterers arranged in a Yagi fashion can be applied to reduce local specific absorption rate (SAR) maxima of a reference SSAD by 40% with only a 6% decrease in the propagated B1+ field at the tissue depth of 15 cm. The higher directivity of the proposed design also decreasing the coupling with additional elements, making this antenna suitable for use in high density arrays. These findings show the potential of parasitic scatterers as an effective method to improve the performance of existing radiative MRI coils.}}, author = {{Sanchez, Juan-Diego and Avendal, Johan and Bibic, Adnan and Lau, Buon Kiong}}, issn = {{0018-926X}}, keywords = {{magnetic resonance imaging; Yagi-Uda antennas; electromagnetic propagation in absorbing media; specific absorption rate}}, language = {{eng}}, number = {{3}}, pages = {{1570--1575}}, publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}}, series = {{IEEE Transactions on Antennas and Propagation}}, title = {{Radiative MRI coil design using parasitic scatterers: MRI Yagi}}, url = {{https://lup.lub.lu.se/search/files/35577005/MRI_Yagi_preprint.pdf}}, doi = {{10.1109/TAP.2018.2794400}}, volume = {{66}}, year = {{2018}}, }