AimTo analyse the influencing factors of images quality with bolus chasing technology for angiography of lower extremity artery with digital subtraction angiography (DSA), and to discuss how to take some methods for controlling the quality of bolus chasing angiography of lower extremity artery.MethodsWith 154 exposure sequences from 67 cases lower extremity artery angiography with DSA by using bolus chasing technology, the influencing factors of the failed or bad images were analysed. ResultsThe influencing factors of the failed or bad images included motion artifact， saturation artifact and the poor vessels showings， of all the 154 exposure sequences, the motion artifacts were 17 exposure sequences (6 angiogram sequences, 11 mask image sequences), the saturation artifact were 17 exposure sequences (9 angiogram sequence, 8 mask image sequences)and the poor vessel showings were 10 of all the 81 angiogram sequences.ConclusionsThe present analysis demonstrates the important keys of getting best images with bolus chasing technology for angiography of lower extremity artery by DSA as follows： effective fixing the patients lower extremity in ordor to prevent motion artifact， placing rubber cuneus to prevent saturation artifact， suitable speeding and doses of contrast， expertly operating machine and medical staff and patients closely matching with each other.