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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: J Magn Reson. 2014 Jul 3;246:62–68. doi: 10.1016/j.jmr.2014.06.019

Figure 5.

Figure 5

Coupling matrices acquired using the on-coil current probes for the 50Ω and amplifier termination cases. (a) The coupling matrix acquired with the coil elements terminated in 50Ω loads. The decoupling network adds an average of -11 dB of decoupling between nearest neighbors to augment the isolation provided by the ULOI amplifiers. (b) The coupling matrix acquired with the coil terminated in the ultra-low output impedance amplifiers. With the amplifiers in line, overall channel-to-channel coupling is an average of -23.6 dB. Minor differences in the reciprocal measurements in both matrices (i.e Sij≠Sji) are due to the fact that all 64 measurements were acquired individually and were therefore subject to slight differences in probe sensitivities.