TY  - JOUR
AU  - Hong, Suk-Min
AU  - Choi, Chang-Hoon
AU  - Shah, N. J.
AU  - Felder, Jorg
TI  - Design of a folded, double-tuned loop coil for 1 H/X-nuclei MRI applications
JO  - IEEE transactions on medical imaging
VL  - 42
IS  - 5
SN  - 0278-0062
CY  - New York, NY
PB  - IEEE
M1  - FZJ-2022-06200
SP  - 1424 - 1430
PY  - 2022
AB  - MR measurement using a combination of X-nuclei and proton MRI is of great interest as the information provided by the two nuclei is highly complementary, with the X-nuclei signal giving metabolic data relating to potential biomarkers and the proton signal affording anatomical details. Due to the relatively weak signal obtained from X-nuclei, combining an X-nuclei coil with a proton coil is also advantageous for B0 shimming and scout images. One approach to building a double-resonant coil is to modify the coil geometry. Here, to achieve double-resonance, a 2× 1 ladder network was designed and tuned at both proton and X-nuclei frequencies successfully. Due to coupling between closed wires, the double-tuned coil generates a shifted transmit efficiency pattern compared to that of the single-tuned loop at the 7T MRI proton frequency. To compensate for the shifted pattern, one part of the 2× 1 ladder network was folded, and the tuning and performance of the folded double-tuned coil were evaluated in simulations and MR measurements. The proposed structure was further evaluated with overlapped decoupling in a receive-only array. The results show that our proposed folded double-tuned coil moderated the shifted pattern of a straight double-tuned loop coil and provided minimum losses at both proton and X-nuclei frequencies. The proposed folded double-tuned loop coil has also been further extended to a receive-only array.
LB  - PUB:(DE-HGF)16
C6  - 37015697
UR  - <Go to ISI:>//WOS:000982483400016
DO  - DOI:10.1109/TMI.2022.3228305
UR  - https://juser.fz-juelich.de/record/916400
ER  -