Table 1.

Scattering matrix measurements show coil match and isolation. The triangular elements enabled local lumped element decoupling between nearest and next-nearest neighbors. No mechanism was installed to counteract distant-neighbor coupling. Values indicate mean ± standard deviation (maximum value).

	S (dB)
Sodium coils
Diagonal elements	−15.8 ± 0.3 (−15.3)
Adjacent neighbors	−13.0 ± 0.4 (−12.4)
Next nearest neighbors	−15.4 ± 0.8 (−14.2)
Distant neighbors	−9.3 ± 0.2 (−8.8)
Proton coils
Diagonal elements	−21.7 ± 1.7 (−18.2)
Adjacent neighbors	−15.2 ± 1.1 (−13.3)
Next nearest neighbors	−13.2 ± 1.0 (−12.2)
Distant neighbors	−11.5 ± 1.0 (−10.6)