Design and construction of a novel H-1/F-19 double-tuned coil system using PIN-diode switches at 9.4 T

作者：Choi Chang Hoon^*; Hong Suk Min; Ha YongHyun; Shah N Jon

来源：Journal of Magnetic Resonance, 2017, 279: 11-15.

DOI：10.1016/j.jmr.2017.04.005

• PIN diode
• Dual tuned
• Double tuned
• Fluorine
• Circularly polarized
• Molecular

A double-tuned H-1/F-19 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 F-19 when the reverse bias voltage was applied (PIN-diode OFF), whilst it was switched to H-1 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 F-19 frequency are nearly as good as those of a single-tuned coil. Since the operating frequency was tuned to F-19 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.

• 出版日期2017-6