Idealized analytical electromagnetic (EM) models predict a spatially non-uniform signal-to-noise-ratio (SNR) gain with increasing coil elements and magnetic field strength. Using realistic EM models, we calculated the performance of prototype 32- and 64-channel receive head arrays at 7T and 10.5T using full-wave simulation with a head-mimicking gel phantom. We obtained SNR and g-factor results in agreement with predictions from ultimate intrinsic calculations, showing ~2-fold SNR gains for a large central region for 64 channels at 10.5T vs. 7T, and lower g-factors with the higher field and higher channel counts; peripheral SNR depended on both field magnitude and channel count.
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