Amorphous selenium flat-panel detector digital radiography versus computed radiography: phantom study of depiction of simulated lesion and dose reduction

Objective To compare an amorphous selenium fiat-panel detector digital radiography(DR) with a computed radiography(CR) for the depiction of simulated pulmonary lesion,as well as for evaluation of dose reduction.Methods Simulated linear,reticular,and nodular lesion were located in all anthropomorphic chest phantom.The phantom was exposed by DR and CR with different mAs sets.The entrance surface doses were recorded for all images.Hard copy images were generated at different dose levels.Images were presented in a random order to four independent radiologists.They subjectively rated the visibility of simulated pulmonary lesion. Statistical significance of difference was analvsed with wilcoxon test.Resuits The visibility of simulated linear and reticular lesions on the images obtained with DR was superior to the images from CR at 2.0 and 3.2 mAs.P 0.05).DR was superior to CR in detection sinail nodular(diameter<10 mm)lesions at different dose level(mAs:2.0,3.2,5.0,6.3),P<0.05(Z=-2.237, P=0.018;Z=-2.384,P=0.017;Z=-2.388,P=0.017;Z=-2.366,P=0.018).When the visibility of simulated pulmonary lesion for DR and CR were equal,The radiation dose was reduce approximately 65% with the DR.Conclusious DR was superior to CR in depiction of tiny lesion and dose reduction greatly. Key words: Digital Radiography;  Simulated Lesion;  Chest Phantom;  Radiation Dose