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The performance of a 128-channel Rx-only 7T brain array was evaluated using simulations and measurements. SNR and g-factor maps show a significant performance increase for highly accelerated imaging in cortical areas from a combination of improved peripheral unaccelerated SNR and g-factor. Measured SNR in cortical areas increased by 42% from 32- to 128-ch and 18% from 64- to 128-ch. The 1/g-factor maps show an improved mean and a tighter distribution, with both effects becoming more pronounced at higher accelerations. At 6x2-fold the 128-channel array has 17.9% g-factor benefit over the 64-ch, and a 48.2% benefit over the 32-ch array.
Gruber et al. (Wed,) studied this question.
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