The Study Of The Signs Of The Diffuse Lung Diseases On High-resolution CT

Objective:To study the performance,characteristics,significance of diffuse lung disease in high-resolution CT(HRCT)and evaluate the diagnostic value of multiplannar reconstruction(MPR) using multislice computed tomography(MSCT)for the diffuse lung diseases.Methods:We studied 89 patients with the diffuse lung diseases who was diagnosed by clinical criterion,including Including pulmonary interstitial edema,lymphangitis carcinomatosa,hypersensitivity pneumonitis,idiopathic pulmonary interstitial fibrosis, pneumoconiosis,such as sarcoidosis.We implemented high-resolution CT scan and thin-thickness coronal reconstruction after completion of MSCT chest scan.The CT signs and distribution were evaluated and correlated with clinical feature,and compared with axial HRCT images.Analysis of images were divided into 3 groups,two observers independently analyzed the overall images in 3 times.Results:The Diffuse lungdiseases had the following HRCT fmd-ings:(1)Intralobular interstitial thickening(20 cases),including fine linear,reticular and radiating appearances and the interface sign.(2) Interlobuar septal thickening(23cases).(3)Thickening of bronchovascular bundles(32 cases),with coarse,blurred or smooth bundles,and nodular shape.(4) emphysema and pneumatocele(15 cases).(5)Ground-glass opacity(28cases) with peripheral,diffuse or locular distribution.(6)Honeycombing(21 cases).(7) traction bronchiectasis(23cases).(8) air-space consolidations(20cases).(9)micronodules(12cases).The sensitivity and specificity of axial HRCT in evaluating ground-grass opacities, air-space consolidations,micronodules,linear opacities were 92%～100%and 88%～100%, respectively The sensitivity and specificity of coronal MPR images were 71%～100%and 90%～100%,respectively,which were no differeance.Satisfaction rating with coronal MPR images in evaluating ground-grass opacities,air-space consolidations,honeycombing,emphysema and bulla were 95%～100%.Satisfaction rating with coronal MPR images in evaluating micronodules,linear opacities,fine reticular opacities and traction bronchiectasis were 10%～68%,which were significant difference(P＜0.05).Conclusions:The findings of the study group showed that the performance of thediffuse lung diseases in HRCT was non-specific performance,but the combination of clinical data,a detailed analysis of the performance of their HRCT type,distribution and extent of disease can be greatly narrowed the scope of the differential diagnosis,and some can be made clearer diagnosis.Thin-thickness coronal MPR images is equal or superior to axial HRCT in evaluating ground-grass opacities,air-space consolidations,honeycombing,emphysema and bulla.Thin-thickness coronal MPR images is inferior to axial HRCT in evaluating micronodules,linear opacities,fine reticular opacities and traction bronchiectasis.