Keywords: RF Arrays & Systems, RF Arrays & Systems, matchingThe noise figure of a matching network between a receive coil and a preamplifier with low input impedance can be estimated using relationship \(F\approx1+R_{11}/R_\mathrm{c}\). It is demonstrated how to use this relationship to choose optimal matching-decoupling network topology in terms of signal-to-noise ratio (SNR). The formula serves as an efficient tool to estimate noise figure of matching networks and is useful in low-field and high-coil-Q applications, where the noise of the matching network becomes comparable to coil noise.
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