we measured the clearance of technetium 99m-labelled diethylene triamine penta-acetate ( 99m tc-dtpa ) with time from the lungs to the blood , in 11 normal , non-smoking subjects ( mean age 30 years ) , ten non-smoking patients with cryptogenic fibrosing alveolitis ( cfa , mean age 57 years ) and ten patients who were non-smokers with obliterative bronchiolitis ( mean age 51 years ) .
C0024109
lungs
C0006272
obliterative