Size, location, and gravitational changes of normal upper lobe pulmonary veins.
D000790:Angiocardiography; D006112:Gravitation; D006334:Heart Function Tests; D006801:Humans; D006976:Hypertension, Pulmonary / Q000000981:diagnostic imaging; D008722:Methods; D011187:Posture; D011651:Pulmonary Artery / Q000000981:diagnostic imaging; D011667:Pulmonary Veins / Q000000981:diagnostic imaging*; D013902:Radiography, Thoracic