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Posterior images from study in which QC event (right-kidney ROI significantly smaller than left-kidney ROI) led to discovery of incorrectly placed left-kidney region. (A) Original region on 2- to 3-min summed image. Little uptake of radiopharmaceutical is seen in left kidney. (B) Nineteen- to 20-min summed image, in which faint outline of left kidney is seen. (C) Two- to 3-min image with redrawn ROI.
