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European Radiology Experimental
Fig. 5 | European Radiology Experimental

Fig. 5

From: Right main pulmonary artery distensibility on dynamic ventilation CT and its association with respiratory function

Fig. 5

CSA changes in two patients with COPD are shown in the four graphs, where the horizontal axis is the respiratory phase, the vertical axis in images (a and b) is CSA (mm2), and the vertical axis in images (c and d) is CSA/S0, which is the direct current component of the DFT components. Case 3 had a high MLD with MLDmax -698.6 and MLD CR 0.106, and case 4 had a low MLD with MLDmax -831.2 and MLD CR 0.041. In the latter case, where the MLD was low, CSA decreased not only on exhalation but also on inhalation. COPD, Chronic obstructive pulmonary disease; CSA, Cross-sectional area; MLD, Mean lung density; RV, Residual lung volume; TLC, Total lung capacity

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