Objective:To assess the value of the dual-energy subtraction chest radiography in detection of simulated pulmonary lesion.Methods:Simulated reticular

linear

and nodular structures were located in an anthropomorphic chest phantom and were performed with chest digital radiography dual-energy subtraction imaging.Four radiologists reviewed chest digital radiography

dual-energy subtraction soft-tissue and bone images.We generated all detection datas.The paired t-test were performed for statistical analysis.Results:There was no statisticaly difference between chest digital radiography and dual-energy subtraction imaging in the visibility of simulated reticular

linear

and big nodular(diameter≥1 cm)structures(P>0.05);however

dual-energy subtraction imaging was superior to chest digital radiography in detection small nodular(diameter<1 cm)structures(P<0.05).Con- clusion:Dual-energy subtraction imaging has higher sensitivity and is superior to digital radiography in detection of pulmonary low-contrast and small structure.