The aortic and hepatic contrast enhancement at CT and its correlations with various body size index / 中华放射学杂志

ABSTRACT

Objective:To evaluate the effect of height (HT), total body weight (TBW), body mass index (BMI), lean body weight (LBW), body surface area (BSA) and blood volume (BV) on aortic and liver contrast enhancement during upper abdominal contrast-enhanced CT scans.Methods:One hundred and thirteen enrolled patients underwent upper abdominal multiphase contrast-enhanced CT scans. The enhancement (&Delta;HU) of aorta in hepatic arterial phase and liver parenchyma in portal venous phase were measured and calculated. The &Delta;HU values difference of aorta and liver parenchyma in subgroups between males and females, TBW<60 kg and TBW≥60 kg, BMI<25 kg/m 2 and BMI≥25 kg/m 2 were compared. To evaluate the effect of the patient′s body parameters on aortic and hepatic enhancement, we performed simple linear regression analyses between the change in CT numbers per gram of iodine (&Delta;HU/gI) at aorta and liver and each of the following HT, TBW, BMI, LBW, BSA, and BV. Pearson and t test were used. Results:The mean &Delta;HU values of aorta and liver were significantly lower at males than that of at females ( P<0.05). They were higher at TBW<60 kg patients than at TBW≥60 kg patients( P<0.05), and the mean &Delta;HU values of the liver at BMI<25 kg/m 2 patients were significantly higher than at BMI≥25 kg/m 2 patients( P<0.05). The proportion of the &Delta;HU values at liver less than 50 HU was higher at males (18.3%, 11/60) than at females (7.5%, 4/53). The most obvious negative correlation coefficients were found between the &Delta;HU/gI of aorta and LBW at hepatic arterial phase ( r=-0.559, P<0.01), and between the &Delta;HU/gI of liver and BSA at portal venous phase ( r=-0.680, P<0.01). Conclusion:LBW or BSA could be the alternative body index to TBW for the calculation of personalized iodine dose protocol at aortic and liver enhanced CT scans.