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  4. Twisted pair transmission line coil - a flexible, self-decoupled and robust element for 7 T MRI
 
research article

Twisted pair transmission line coil - a flexible, self-decoupled and robust element for 7 T MRI

Vliem, Jules
•
Xiao, Ying  
•
Wenz, Daniel  
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February 19, 2024
Magnetic Resonance Imaging

Objective: This study evaluates the performance of a twisted pair transmission line coil as a transceive element for 7 T MRI in terms of physical flexibility, robustness to shape deformations, and interelement decoupling. Methods: Each coil element was created by shaping a twisted pair of wires into a circle. One wire was interrupted at the top, while the other was interrupted at the bottom, and connected to the matching circuit. Electromagnetic simulations were conducted to determine the optimal number of twists per length (in terms of B,+ field efficiency, SAR efficiency, sensitivity to elongation, and interelement decoupling properties) and for investigating the fundamental operational principle of the coil through fields streamline visualisation. A comparison between the twisted pair coil and a conventional loop coil in terms of B,+ fields, maxSAR,0g, and stability of S,, when the coil was deformed was performed. Experimentally measured interelement coupling between individual elements of multichannel arrays was also investigated. Results: Increasing the number of twists per length resulted in a more physically robust coil. Poynting vector streamline visualisation showed that the twisted pair coil concentrated most of the energy in the near field. The twisted pair coil exhibited comparable B,+ fields and improved maxSAR,0g to the conventional coil but demonstrated exceptional stability with respect to coil deformation and a strong self-decoupling nature when placed in an array configuration. Discussion: The findings highlight the robustness of the twisted pair coil, showcasing its stability under shape variations. This coil holds great potential as a flexible RF coil for various imaging applications using multipleelement arrays, benefiting from its inherent decoupling.

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Type
research article
DOI
10.1016/j.mri.2024.02.007
Web of Science ID

WOS:001196935000001

Author(s)
Vliem, Jules
Xiao, Ying  
Wenz, Daniel  
Xin, Lijing  
Teeuwise, Wouter
Ruytenberg, Thomas
Webb, Andrew
Zivkovic, Irena
Date Issued

2024-02-19

Publisher

Elsevier Science Inc

Published in
Magnetic Resonance Imaging
Volume

108

Start page

146

End page

160

Subjects

Life Sciences & Biomedicine

•

Twisted Pair

•

Flexible Coils

•

7 T Arrays

•

Ultra -High Field Mri

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CIBM  
Available on Infoscience
April 17, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/207359
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