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Fig. 3A —Variation in radiation dose as function of patient position, shown on scout images from MDCT of elbow in three children evaluated for acute elbow trauma. 6-year-old girl is correctly positioned with elbow superior to vertex of skull and forearm angled to x,y-plane, with resulting volume CT dose index of 0.98 mGy and dose–length product of 9.73 mGy·cm.