For pulmonary arterial and venous variation assessment , there were no significant differences in sensitivity , specificity , and accuracy among non-contrast-enhanced MRA ( pulmonary arteries : sensitivity , 77.1 % ; specificity , 97.4 % ; accuracy , 87.7 % ; pulmonary veins : sensitivity , 50 % ; specificity , 98.5 % ; accuracy , 93.2 % ) , 4D contrast-enhanced MRA ( pulmonary arteries : sensitivity , 77.1 % ; specificity , 97.4 % ; accuracy , 87.7 % ; pulmonary veins : sensitivity , 62.5 % ; specificity , 100.0 % ; accuracy , 95.9 % ) , and thin-section contrast-enhanced MDCT ( pulmonary arteries : sensitivity , 91.4 % ; specificity , 89.5 % ; accuracy , 90.4 % ; pulmonary veins : sensitivity , 50 % ; specificity , 100.0 % ; accuracy , 95.9 % ) ( p > 0.05 ) .