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Fully encoded sagittal 1-mm isotropic MPRAGE images with GRAPPA acceleration factor of R = 3. For coil performance comparison, the images were acquired with the 4-year-old (a, c) and the adult 32-channel (b, d) array coils using the same adult subject. Corresponding close ups (c, d) show better image details using the size matched array coil for 4-year-old children.
