Abstract: To investigate the feasibility of threedimensional dynamic contrastenhanced MR angiography (3DDCEMRA) with realtime fluoroscopic triggering in carotid arteries. Methods： Threedimensional time of flight MR angiography (3DTOFMRA) and 3DDCEMRA were performed in 60 cases. 3DTOFMRA imaging sequence was threedimensional fast gradient echo with thin slice and multislab, and 3DDCEMRA imaging sequence was threedimensional time of flight spoiled gradient echo. The 2025?ml GdDTPA was injected with the rate of 2.03.0?ml/sec and the dose 0.150.2?ml/kg. With the MR fluoroscopic triggering technique, all the primary graphs were analyzed by maximum intensity projection reconstruction in the post processing station. The image qualities, included sensitivity, continuity and sharpedged degree of these two different techniques were evaluated according to the diagnosed demand and dissecting. Results： Major branch was displayed in 57 cases, which presented 95% of total of cases classified as good image quality. 3DDCEMRA had significantly higher sensitivity, continuity, and sharpedged degree than 3DTOFMRA in evaluation of carotiarteries. Conclusion： 3DDCEMRA is an effectively and minimally invasive method for evaluating lesions in carotid arteries.

Key words: Magnetic fluoroscopy, Magnetic resonance angiography, Carotid arteries