Fig. 3From: Relationship of flow-volume curve pattern on pulmonary function test with clinical and radiological features in idiopathic pulmonary fibrosisQuantitative computed tomography (CT) analysis for peripheral and central lung area in the same patient presented in Fig. 2. a and c Peripheral lung area calculated as a 15-pixels area on the pleural side. b and d Central lung area calculated by removing the peripheral lung area from the whole lung areaBack to article page