Fig. 1From: Vector-field dynamic x-ray (VF-DXR) using optical flow method in patients with chronic obstructive pulmonary diseaseFlow chart of inclusion and exclusion criteria for this study. COPD Chronic obstructive pulmonary disease, DXR Dynamic x-ray, FEV1% Forced expiratory volume percent in one second divided by forced vital capacity, GOLD Global initiative for chronic obstructive lung disease, PFT Pulmonary function test, %VC Percent predicted vital capacityBack to article page