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Fig. 2 —Plot of aortic attenuation (H) versus body weight (kg).
Strong inverse correlation existed between aortic attenuation and body weight
(r = –0.73, 
= –0.74, p < 0.001). This
indicates aortic attenuation is reduced in heavier patients. Regression
formula (aortic attenuation [H] = 520–2.2 weight [kg]) indicates that
1.0 mL/kg (e.g., 75 mL for a 75-kg patient) of 350 mg I/mL contrast medium is
required to achieve aortic attenuation of 355 H. + = low-body mass index (BMI)
group (BMI < 30), o = high-BMI group (BMI 
30). Ninety-five percent CIs
(dotted fitting lines) are fit to regression line (solid fitting
line).
