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Figure 1


Fig. 1A —62-year-old man with pleural effusion. Standard-dose (A, 150 mA) and reduced-dose (B, 50 mA) CT images at same level. In 50-mA image, increased mottles and black streaks over mediastinum and soft tissues on right lung are noticeable. SD of CT attenuation in region of interest measured on ascending aorta (20 x 20 pixels) was 8.3 H for 150-mA image and 13.9 H for 50-mAs image.