Fig. 2
The component distribution histograms of DECT parameter in a 66-year-old man, diagnosed with interstitial lung disease associated with MCTD (PM/DM and Sjögren syndrome). Row a presents colored split lung lobes in 3D and axial computed tomographic images of the chest at the three levels. The histograms of Zeff value were shown in Row b. Compared with each other, shape of the histogram in lower lung lobes with complex lesions was wider, the mean value was higher and the wave peaks are more than those of the middle and upper lung lobes. In RL, RM, RU, LL, LU order, the mean Zeff value was 3.835, 2.600, 1.758, 3.516 and 1.610 respectively. Row c presented each lung lobe along with bronchovascular bundle in three-dimension (3D), and blue represents the interstitial lung abnormalities