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In the image domain (top row), a fully sampled image (left) multiplied by a localized coil sensitivity profile (center) results in a single-coil image (right). Looking at the same relationship in k-space (bottom row), the k-space of the object (left) is smeared (or convolved) with the k-space of the coil sensitivity (center), resulting in spreading of the k-space data across several points in the single-coil k-space (right).
