Fig. 3

Inner diameter of the bronchial tube. a and b were the same patient, male, 72 years old, hemoptysis for more than 1 week. Lung cancer was confirmed by pathology. a: The maximum inner diameter of the bronchial tube at the hollow end of the inspiratory phase was 1.20 mm. b: The maximum inner diameter of the bronchial tube at the hollow end of the expiratory phase was 1.18 mm. c and d were the same patient, female, 58 years old, coughing for more than 1 month. Tuberculosis was confirmed by pathology. c: The maximum diameter of bronchial tube at the hollow end of inspiratory phase was 1.00 mm. d: The maximum diameter of bronchial tube at the hollow end of expiratory phase was 0.90 mm