TY  - JOUR
AU  - Choi, Chang-Hoon
AU  - Hong, Suk-Min
AU  - Ha, YongHyun
AU  - Shah, N. J.
TI  - Design and construction of a novel 1 H/ 19 F double-tuned coil system using PIN-diode switches at 9.4 T
JO  - Journal of magnetic resonance
VL  - 279
SN  - 1090-7807
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2019-02105
SP  - 11 - 15
PY  - 2017
AB  - A double-tuned 1H/19F coil using PIN-diode switches was developed and its performance evaluated. The is a key difference from the previous developments being that this design used a PIN-diode switch in series with an additionally inserted inductor in parallel to one of the capacitors on the loop. The probe was adjusted to 19F when the reverse bias voltage was applied (PIN-diode OFF), whilst it was switched to 1H when forward current was flowing (PIN-diode ON).S-parameters and Q-factors of single- and double-tuned coils were examined and compared with/without a phantom on the bench. Imaging experiments were carried out on a 9.4 T preclinical scanner. All coils were tuned at resonance frequencies and matched well. It is shown that the Q-ratio and SNR of double-tuned coil at 19F frequency are nearly as good as those of a single-tuned coil. Since the operating frequency was tuned to 19F when the PIN-diodes were turned off, losses due to PIN-diodes were substantially lower resulting in the provision of excellent image quality of X-nuclei.
LB  - PUB:(DE-HGF)16
C6  - pmid:28411437
UR  - <Go to ISI:>//WOS:000404322700002
DO  - DOI:10.1016/j.jmr.2017.04.005
UR  - https://juser.fz-juelich.de/record/861668
ER  -