%0 Journal Article
%A Hong, Suk-Min
%A Choi, Chang-Hoon
%A Magill, Arthur W.
%A Jon Shah, N.
%A Felder, Jarg
%T Design of a Quadrature 1H/31P Coil Using Bent Dipole Antenna and Four-Channel Loop at 3T MRI
%J IEEE transactions on medical imaging
%V 37
%N 12
%@ 0278-0062
%C New York, NY
%I IEEE
%M FZJ-2019-01795
%P 2613 - 2618
%D 2018
%X MRI using nuclei other than protons is of clinical interest due to the important role of these nuclei in cellular processes. Phosphorous-31 ( 31 P), for example, plays an important role in energy metabolism. However, measurement of 31 P can be challenging, as the receive signal is weak compared with that of proton ( 1 H). Consequently, it is often necessary to integrate 1 H elements for localizations and B0 shimming in RF coils intended for 31 P measurements. Good decoupling between the 1 H and the 31 P elements is therefore essential. In this paper, bent dipole antennas tuned to 1 H were integrated with a four channel 31 P loop coil array, in a manner providing strong geometric decoupling between dipoles and loops. As the physical length of a resonant dipole antenna is too long at 3T, the dipole antennas were bent around the load. The loss of 31 P elements due to the presence of the dipole antennas was evaluated by measuring scattering parameters and comparing the SNR of 31 P spectra with and without the presence of the dipole antennas. The performance of the bent dipole antenna was evaluated by simulation and sensitivity measurement. The Q-factors and the SNR of the four-loop array were reduced by less than 5% when the bent dipole antennas were introduced. The measured sensitivity of the bent dipole was higher (15%) than that of dual-tuned birdcage. The combined bent dipole and loop array is therefore a promising design for 1 H/ 31 P applications at 3T.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:29994198
%U <Go to ISI:>//WOS:000451903400006
%R 10.1109/TMI.2018.2844462
%U https://juser.fz-juelich.de/record/861300