TY - JOUR
T1 - Analysis of High Impedance Coils Both in Transmission and Reception Regimes
AU - Mollaei, Masoud Sharifian Mazraeh
AU - Van Leeuwen, Carel C.
AU - Raaijmakers, Alexander J.E.
AU - Simovski, Constantin R.
N1 - Funding Information:
This work was supported by the European Union's Horizon 2020 Research and Innovation Program under Grant 736937.
Funding Information:
This work was supported by the European Union’s Horizon 2020 Research and Innovation Program under Grant 736937.
Publisher Copyright:
© 2013 IEEE.
PY - 2020
Y1 - 2020
N2 - Theory of a high impedance coil (HIC) - a cable loop antenna with a modified shield - is comprehensively discussed for MRI application in both transmitting and receiving regimes. Understanding a weakness of the previously reported HIC in transmitting regime, we suggest another HIC which is advantageous in both transmitting and receiving regimes compared to a conventional loop antenna. In contrast with the claim of previous works that the reported HICs are advantageous in transmission regime, we show only this HIC is a practical transceiver HIC. Using the perturbation approach and adding gaps to both shield and inner wire of the cable, we tune the resonance frequency to be suitable for ultra-high field (UHF) magnetic resonance imaging (MRI). These gaps reduce the quality factor of the enhanced HIC which makes its resonant frequency more stable with respect to different loadings. Our theoretical model and applicability of our HIC for MRI applications are verified by simulations. Using the theoretical model, we have designed and fabricated an array of three HICs operating at 298 MHz. The operation of the array has been experimentally studied in the presence of different phantoms used in ultrahigh field MRI and the results compared with those obtained for a conventional array.
AB - Theory of a high impedance coil (HIC) - a cable loop antenna with a modified shield - is comprehensively discussed for MRI application in both transmitting and receiving regimes. Understanding a weakness of the previously reported HIC in transmitting regime, we suggest another HIC which is advantageous in both transmitting and receiving regimes compared to a conventional loop antenna. In contrast with the claim of previous works that the reported HICs are advantageous in transmission regime, we show only this HIC is a practical transceiver HIC. Using the perturbation approach and adding gaps to both shield and inner wire of the cable, we tune the resonance frequency to be suitable for ultra-high field (UHF) magnetic resonance imaging (MRI). These gaps reduce the quality factor of the enhanced HIC which makes its resonant frequency more stable with respect to different loadings. Our theoretical model and applicability of our HIC for MRI applications are verified by simulations. Using the theoretical model, we have designed and fabricated an array of three HICs operating at 298 MHz. The operation of the array has been experimentally studied in the presence of different phantoms used in ultrahigh field MRI and the results compared with those obtained for a conventional array.
KW - High impedance
KW - magnetic resonance imaging
KW - transceiver antenna
KW - Coils
KW - Couplings
KW - Magnetic resonance imaging
KW - Resonant frequency
KW - Impedance
KW - Antenna arrays
UR - http://www.scopus.com/inward/record.url?scp=85089242163&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2020.3009367
DO - 10.1109/ACCESS.2020.3009367
M3 - Article
AN - SCOPUS:85089242163
VL - 8
SP - 129754
EP - 129762
JO - IEEE Access
JF - IEEE Access
M1 - 9141227
ER -