Journal article · Ahead of Print article
Radiative MRI Coil Design Using Parasitic Scatterers: MRI Yagi
Department of Electrical Engineering, Technical University of Denmark1
Center for Hyperpolarization in Magnetic Resonance, Centers, Technical University of Denmark2
Center for Magnetic Resonance, Department of Electrical Engineering, Technical University of Denmark3
Lite-On Mobile Mechanical AB4
Lund University5
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.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2018 |
| Pages: | 1570-1575 |
| ISSN: | 15582221 and 0018926x |
| Types: | Journal article and Ahead of Print article |
| DOI: | 10.1109/TAP.2018.2794400 |
| ORCIDs: | Sanchez-Heredia, Juan D. |
Antenna arrays Dipole antennas Electromagnetic propagation in absorbing media Magnetic resonance imaging Radio frequency Specific absorption rate Substrates Yagi-Uda antennas
MRI Yagi RF coil designs Yagi–Uda antennas antenna design techniques biological tissues biomedical MRI coils dipole antennas local specific absorption rate maxima magnetic resonance imaging magnetic resonance imaging (MRI) near-field operation parasitic scatterers radiative MRI coil design radio frequency coils single-sided adapted dipole antenna specific absorption rate (SAR) ultrahigh field MRI
