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Fig. 1B —Examples of discrepancy between body weight, body mass index (BMI), and noise at level of heart. All images are axial unenhanced images obtained at 300 mA. Insets in top right-hand corner show anteroposterior topograms. SD represents noise level and has exponential relationship with attenuation coefficient of scanning region. SD values were obtained from centrally located left atrium that contains homogeneous fluid (blood). Unenhanced image of 74-year-old woman with large breasts who weighs 67 kg (BMI = 27.88) (A) shows higher noise (SD of CT attenuation values = 19.65 H) than unenhanced image of 66-year-old man with small breasts who weighs 76 kg (BMI = 27.25) (B) with SD of 12.70 H.