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Fig. 4D —9-year-old 26-kg girl with mediastinal lymphoma and pleural effusion. All images were rated good diagnostic quality. Clinical chest MDCT scan corresponding to A and B obtained with true tube current at soft-tissue (C) and lung (D) windows. Mean image noise is 12.1 H; volume CT dose index, 3.7 mGy; effective dose, 1.9 mSv. Dose was not reduced in comparison with weight-adapted standard pediatric protocol.