Pulmonary arteriogram is an examination method that injects contrast into the pulmonary artery so that the pulmonary artery is visualized under radiation to understand the location and nature of the pulmonary vascular lesion. Pulmonary arteriogram is mainly used to diagnose and treat the following diseases: 1) pulmonary aneurysm and pulmonary arteriovenous fistula: to understand the size and opening location of aneurysm and fistula; 2) congenital pulmonary arteriovenous malformation: to show the size and location of vascular malformation; 3) pulmonary embolism: to understand the degree of pulmonary embolism and the location of embolism, etc.