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. Author manuscript; available in PMC: 2021 Apr 1.
Published in final edited form as: Magn Reson Med. 2019 Oct 8;83(4):1512–1518. doi: 10.1002/mrm.28005

Figure 1.

Figure 1

Photograph of the 17O/1H array without protective cover (A). The blue and red overlays indicate the contour of individual 17O and 1H coils, respectively. The interface components, including preamplifiers, power dividers, and transmit/receive switches, are located superior to the coils to reduce PET attenuation in future MR/PET studies.

Schematic diagram of the 17O/1H coil array and interface (B). 17O coils are represented in blue and 1H coils in red. For simplicity one 17O and 1H coil are highlighted. For both the 17O and 1H arrays the status of the DC bias is forward in transmit mode and reverse in receive mode. In receive mode the diodes D1 provide isolation between the RF amplifier and preamplifiers. The diode D2 provides isolation between the RF amplifier and the preamplifier in transmit mode. During proton body coil excitation the diode D3 along with L3 and C4 forms the detuning circuit, the diode D4 provides protection for the preamplifier. Typical component values are C1=47 pF, C2=200pF, C3=300pF, C4 =15pF, C5=27pF, Cm1=180pF, Cr=18pF, Ct = 2–15 pF, L1= 38nH, L2 = 80nH, L3= 105 nH and L4 = 60 nH, L5 = 230 nH, RFC1 = 10μH, RFC2 =2.2μH, RFS =1000pF.