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Radiative MRI coil design using parasitic scatterers: MRI Yagi

Sanchez, Juan-Diego LU ; Avendal, Johan; Bibic, Adnan LU and Lau, Buon Kiong LU (2018) In IEEE Transactions on Antennas and Propagation1963-01-01+01:00 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)
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author
organization
publishing date
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 Propagation1963-01-01+01:00
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
language
English
LU publication?
yes
id
c9884187-e870-4363-b99a-45ce5d289229
date added to LUP
2017-12-12 14:32:34
date last changed
2018-05-29 11:17:09
@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},
  keyword      = {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 Propagation1963-01-01+01:00},
  title        = {Radiative MRI coil design using parasitic scatterers: MRI Yagi},
  url          = {http://dx.doi.org/10.1109/TAP.2018.2794400},
  volume       = {66},
  year         = {2018},
}