Forty-five patients ( 25 men , 20 women ; mean age , 65.6 9.7 [ SD ] years ; mean body weight , 74.9 12.4 kg ) underwent contrast-enhanced single-phase dual-energy CT of the abdomen by a random assignment to one of three different contrast medium ( iomeprol 400 ) dose injection protocols : 1.3 , 1.0 , or 0.65 mL/kg of body weight .