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SNR gain of the 24-channel PET/MR coil array versus the 16-channel commercial reference coil. (a) Photograph of the head-shaped gel phantom used for measurements, (b) central coronal slice, (c) central sagittal slice, and (d) central transversal slice. The mean relative SNR gain (red) is indicated for each region-of-interest (ROI). Losses are shown in blue.
