ABSTRACT
ObjectiveTo evaluate the clinical feasibility of low dose MSCT for quantitative assessment of pulmonary function in smokers.MethodsOne hundred and forty-six patients with chronic objective pulmonary disease ( COPD ) including 109 smokers ( 74.6％ ) and 37 non-smokers ( 25.3％ )underwent pulmonary function test and low-dose MSCT scan.All data were analyzed using computer-aided lung anlysis software.Pulmonary function parameters from low-dose MSCT were compared between smokers and non-smokers and also compared with pulmonary function test in non-smokers ( Pearson test).Results In smokers,the average volume at full inspiratory phase (Vin) was (5125 ± 862 ) ml,mean lung attenuation was ( - 902 ± 26 ) HU,mean lung density was (0.0984 ± 0.0260 ) g/cm3,emphysema volume was (2890 ±1370) ml.The average volume at full expiratory phase (Vex) was (2756 ±1027) ml,mean lung attenuation was ( -811 ±62) HU,mean lung density was (0.1878 ±0.0631 ) g/cm3,emphysema volume was (685 ±104) ml.In non-smokers,the average Vin was (3734 ± 759) ml,mean lung attenuation was ( -876 ±40) HU,mean lung density was (0.1244 ±0.0401 )g/cm3,emphysema volume was ( 1503 ± 1217) ml.The average Vex was ( 1770 ± 679 ) ml,mean lung attenuation was ( - 765 ± 56 ) HU,mean lung density was (0.2360 ± 0.0563 ) g/cm3,emphysema volume was ( 156 ± 45 ) ml.There were significant differences between smokers and non-smokers (P ＜0.01 ).The Vex/Vin was correlated with residual volume/total lung capacity ( RV/TLC,r =0.60,P＜0.01 ),and Vin was correlated with TLC ( r =0.58,P ＜ 0.01 ),Vex with RV ( r =0.59,P＜0.01 ).Pixel index ( PI ) -950in was correlated with FEV 1％ pre and FEV1/FVC％ ( r =- 0.53,- 0.62,respective,P ＜ 0.01 ),Pl-950ex was correlated with FEV1 ％ pre and FEV1/FVC％ ( r =-0.71,-0.77,respective,P＜0.0l).ConclusionLow-dose MSCT can be a potential imaging tool for quantitative pulmonary function assessment in smokes.
ABSTRACT
r diagnosing the disease to combine pathology, immunohistochemistry and SYT-SSX gene detection.