Abstract: Objective To investigate the diagnostic value of dual-low dose bronchial arterial multislice computed tomography angiography （MSCTA） in hemoptysis patients underwent therapeutic embolization preoperatively. Methods A retrospective analysis of 39 cases of hemoptysis patients was carried out. Enrolled patients received dual- low dose （low dose of contrast agent and low dose of radiation dose） bronchial artery CT angiography（CTA） examination and routine digital subtraction angiography（DSA）examination，and were further divided into CTA group and DSA group to make a comparative study. Results There were 104 and 107 branches of the bronchial arteries found by CTA examination and intraoperative DSA examination，respectively. With the findings of DSA as standard，the diagnostic coincidence rates of CTA detected bronchial arteries of normal origin，minor feeding arteries of anomalous origin，and anomalous pulmonary lesions supplied by the bronchial artery were 100%，89% and 100%，respectively.Conclusion Dual -low dose bronchial arterial MSCTA examination has high sensitivity in detecting bronchial artery，and ideal enhancement effect of the collateral feeding artery that can clearly display lesions in the area of the pulmonary. Radiation dose in patients with dual-low dose bronchial arterial CTA examination is considerably lower than that of DSA. The patient′s comfort is improved.

Key words: Dual-low dose, X- ray computed tomography, bronchial artery, hemoptysis, bronchial artery embolization