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Signal to noise maps of a human head-shaped water phantom (sagittal and axial slice) for the 8-channel PET/MR, the 31-channel PET/MR and a standard 32-channel MR-only array. The gain in SNR compared to the 8ch PET/MR coil for the ROIs shown is: (a) 2.3, (b) 1.6, (c) 1.7, (d) 2.2, (e) 1.8, (f) 2.1. The SNR of the 31-channel PET/MR coil shows a large improvement compared to the 8-channel coil, and shows no overall SNR loss compared to the 32-channel MR-only array.
