. Author manuscript; available in PMC: 2019 Aug 1.

Published in final edited form as: Magn Reson Med. 2019 Mar 29;82(2):833–841. doi: 10.1002/mrm.27743

Table 1.

Hardware specifications.

	8-channel configuration	32-channel configuration
RF Transmitter	Clamshell Capacitively-coupled Helmholtz pair (square loops ~30.5×30.5 cm²)	16-rung low-pass birdcage (30.5 cm diameter, 32 cm rung length)
Receiver elements	2 paddle coils, 4 elements each (5 cm × 10 cm)	Hexagonal/pentagonal soccer ball geometry: 16 elements on top; 16 on bottom (8–10 cm diameter) Q_UL /Q_L = 250/90
Receiver elements	Return loss (S₁₁) < −17dB
Receiver decoupling	Overlapped to minimize mutual inductance Pre-amp decoupling for next-to-nearest neighbor Transmission loss (S₂₁) < −17dB for nearest neighbor
Detuning & blocks	Active detuning for carbon >30dB with passive blocking for proton
Preamps	28 dB gain