ABSTRACT
Objective To study the relationship between pulmonary quantitative indicators on 64-slice spiral CT and lung function,and the diagnosis value of breathing bipolar lung CT scan to emphysema.Methods 54 chronic obstructive pulmonary disease patients were divided into the mild group ( n =5 ) , moderate group ( n =21 ) , severe group(n=19) and gravely severe group(n=9).Four groups received breathing bipolar total lung high-resolution CT scan to test lung density at the end of deep inspiration and expiration,breathing bipolar lung density difference and lung volume,and the relationship between lung density/volume and lung function indicators were analyzed.Results There were significant differences in lung density at the end of deep inspiration and expiration(t=13.67,9.89,all P0.05).The lung volumes at the end of deep inspiration and expiration were obvi-ously correlated with FVC,FEV1 and FEV1/FVC(r=-0.071,-0.083,r=-0.713,-0.542,r=-0.622,0.639, all P<0.05) .The lung volume at the end of deep expiration was obviously correlated with the expected ratio of resid-ual volume to maximum total lung capacity(r=0.622,P<0.05).The deep aspiratory phase lung density was closely correlated with FEV1/FVC and residual volume(r=0.539,P<0.05).Conclusion Pulmonary quantitative indica-tors on 64-slice spiral CT and pulmonary function has good correlation,which can be used to evaluate the severity of emphysema in patients with chronic obstructive pulmonary disease.
ABSTRACT
Objective To study the window technique in evaluating the chronic obstructive emphysema and pulmonary residual volume in long-term smoker without symptoms.Methods 50 cases with chronic obstructive emphysema proved clinically,50 long-term smokers were undergone spiral CT scan of chest and compared with 30 health volunteer,the images were designed using the mean CT value in smoking group as window level and two times of ?2 as window width.Results The white imaging was appeared in the most of the group of volunteer,the images were dark on different degree in group one,while the images were as ground glass on different degree in group two.Conclusion This window technique is helpful in evaluating the chronic obstructive emphysema and residual volume of lung in long-term smoker