Hemoptysis is a common clinical respiratory symptom, and severe hemoptysis may be life⁃threatening. With advances in imaging technology, CT has been increasingly applied in the diagnosis of hemoptysis. Conventional CT, CT angiography, and emerging CT technologies such as cone⁃beam CT, Angio⁃CT, CT perfusion, and spectral CT play an important role in hemorrhage localization, etiology analysis, and responsible artery identification, providing reliable information for the accurate implementation of bronchial artery embolization. This review summarizes the etiology, related vessel anatomy, and pathophysiological basis of hemoptysis, the diagnostic methods and CT conventional imaging manifestations of hemoptysis, and the application progress on CT technology in the diagnosis of hemoptysis, aiming to improve diagnostic efficiency and therapeutic outcomes of hemoptysis, and eventually enhance patients' prognosis.

无